Improve security mitigations

Instead of validating the AST in the parser, fix the compiler instead by
handling the types in a safe way.

.eslintignore

@@ -0,0 +1,24 @@
+.rvmrc
+.DS_Store
+/tmp/
+*.sublime-project
+*.sublime-workspace
+npm-debug.log
+.idea
+yarn-error.log
+node_modules
+/handlebars-release.tgz
+.nyc_output
+
+# Generated files
+lib/handlebars/compiler/parser.js
+/coverage/
+/dist/
+/tests/integration/*/dist/
+
+# Third-party or files that must remain unchanged
+/spec/expected/
+/spec/vendor
+
+# JS-Snippets
+src/*.js

.eslintrc.js

@@ -0,0 +1,66 @@
+module.exports = {
+  extends: ['eslint:recommended', 'plugin:compat/recommended', 'prettier'],
+  globals: {
+    self: false
+  },
+  env: {
+    node: true,
+    es6: true
+  },
+  rules: {
+    'no-console': 'warn',
+
+    // temporarily disabled until the violating places are fixed.
+    'no-func-assign': 'off',
+    'no-sparse-arrays': 'off',
+
+    // Best Practices //
+    //----------------//
+    'default-case': 'warn',
+    'guard-for-in': 'warn',
+    'no-alert': 'error',
+    'no-caller': 'error',
+    'no-div-regex': 'warn',
+    'no-eval': 'error',
+    'no-extend-native': 'error',
+    'no-extra-bind': 'error',
+    'no-floating-decimal': 'error',
+    'no-implied-eval': 'error',
+    'no-iterator': 'error',
+    'no-labels': 'error',
+    'no-lone-blocks': 'error',
+    'no-loop-func': 'error',
+    'no-multi-str': 'warn',
+    'no-global-assign': 'error',
+    'no-new': 'error',
+    'no-new-func': 'error',
+    'no-new-wrappers': 'error',
+    'no-octal-escape': 'error',
+    'no-process-env': 'error',
+    'no-proto': 'error',
+    'no-return-assign': 'error',
+    'no-script-url': 'error',
+    'no-self-compare': 'error',
+    'no-sequences': 'error',
+    'no-throw-literal': 'error',
+    'no-unused-expressions': 'error',
+    'no-warning-comments': 'warn',
+    'no-with': 'error',
+    radix: 'error',
+
+    // Variables //
+    //-----------//
+    'no-label-var': 'error',
+    'no-undef-init': 'error',
+    'no-use-before-define': ['error', 'nofunc'],
+
+    // ECMAScript 6 //
+    //--------------//
+    'no-var': 'error'
+  },
+  parserOptions: {
+    sourceType: 'module',
+    ecmaVersion: 6,
+    ecmaFeatures: {}
+  }
+};

.git-blame-ignore-revs

@@ -1,6 +0,0 @@
-# Upgrade to Prettier 2.7
-3d228334530860a6e3f99dc10777c84bf22292c1
-# Format markdown files with Prettier
-dfe2eaaf20f0b679d94e5a799757c4394d80f1cc
-# migrate to oxlint and oxfmt
-0c1d00282ca619c3416ad819bdf53c0852b32415

.github/ISSUE_TEMPLATE.md

@@ -1,9 +0,0 @@
-Before filing issues, please check the following points first:
-
-- [ ] Please don't open issues for security issues. Instead, file a report at https://www.npmjs.com/advisories/report?package=handlebars
-- [ ] Have a look at https://github.com/handlebars-lang/handlebars.js/blob/master/CONTRIBUTING.md
-- [ ] Read the FAQ at https://github.com/handlebars-lang/handlebars.js/blob/master/FAQ.md
-- [ ] Use the jsfiddle-template at https://jsfiddle.net/4nbwjaqz/4/ to reproduce problems or bugs
-
-This will probably help you to get a solution faster.
-For bugs, it would be great to have a PR with a failing test-case.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,12 +0,0 @@
-Before creating a pull-request, please check https://github.com/handlebars-lang/handlebars.js/blob/master/CONTRIBUTING.md first.
-
-Generally we like to see pull requests that
-
-- [ ] Please don't start pull requests for security issues. Instead, file a report at https://www.npmjs.com/advisories/report?package=handlebars
-- [ ] Maintain the existing code style
-- [ ] Are focused on a single change (i.e. avoid large refactoring or style adjustments in untouched code if not the primary goal of the pull request)
-- [ ] Have good commit messages
-- [ ] Have tests
-- [ ] Have the [typings](https://www.typescriptlang.org/docs/handbook/declaration-files/introduction.html) (types/index.d.ts) updated on every API change. If you need help, updating those, please mention that in the PR description.
-- [ ] Don't significantly decrease the current code coverage (see coverage/lcov-report/index.html)
-- [ ] Please target the `master` branch in the PR.

.github/dependabot.yml

@@ -1,7 +1,7 @@
 version: 2
 updates:
   - package-ecosystem: npm
-    directory: '/'
+    directory: "/"
     open-pull-requests-limit: 0
     schedule:
       interval: weekly

.github/workflows/ci.yml

@@ -12,12 +12,12 @@ jobs:
     runs-on: 'ubuntu-latest'
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v4
 
       - name: Setup Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v4
         with:
-          node-version: '24'
+          node-version: '16'
 
       - name: Install dependencies
         run: npm ci
@@ -33,16 +33,16 @@ jobs:
       matrix:
         operating-system: ['ubuntu-latest', 'windows-latest']
         # https://nodejs.org/en/about/releases/
-        node-version: ['20', '22', '24']
+        node-version: ['16', '18', '20', '22']
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v4
         with:
           submodules: true
 
       - name: Setup Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
 
@@ -52,27 +52,27 @@ jobs:
       - name: Test
         run: npm run test
 
-      - name: Test (Publish)
-        if: matrix.node-version != '20'
-        run: npx vitest run --project publish
-
       - name: Test (Integration)
-        if: matrix.operating-system == 'ubuntu-latest'
+        # https://github.com/webpack/webpack/issues/14532
-        run: npm run test:integration
+        if: ${{ matrix.node-version == '16' }}
+        run: |
+          cd ./tests/integration/rollup-test && ./test.sh && cd -
+          cd ./tests/integration/webpack-babel-test && ./test.sh && cd -
+          cd ./tests/integration/webpack-test && ./test.sh && cd -
 
   browser:
     name: Test (Browser)
-    runs-on: ubuntu-latest
+    runs-on: 'ubuntu-22.04'
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v4
         with:
           submodules: true
 
       - name: Setup Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v4
         with:
-          node-version: '24'
+          node-version: '16'
 
       - name: Install dependencies
         run: npm ci
@@ -83,9 +83,7 @@ jobs:
           npx playwright install
 
       - name: Build
-        run: npm run build
+        run: npx grunt prepare
 
       - name: Test
-        run: |
+        run: npm run test:browser
-          npm run test:browser-smoke
-          npm run test:browser

.github/workflows/release.yml

@@ -15,14 +15,14 @@ jobs:
     environment: 'builds.handlebarsjs.com.s3.amazonaws.com'
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v2
         with:
           submodules: true
 
       - name: Setup Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v2
         with:
-          node-version: '24'
+          node-version: '16'
 
       - name: Install dependencies
         run: npm ci
@@ -33,7 +33,6 @@ jobs:
           git config --global user.name "handlebars-lang"
           npm run publish:aws
         env:
-          S3_BUCKET_NAME: 'builds.handlebarsjs.com'
+          S3_BUCKET_NAME: "builds.handlebarsjs.com"
-          S3_REGION: 'us-east-1'
           S3_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY_ID }}
           S3_SECRET_ACCESS_KEY: ${{ secrets.S3_SECRET_ACCESS_KEY }}

.gitignore

@@ -12,8 +12,9 @@ node_modules
 .nyc_output
 
 # Generated files
+lib/handlebars/compiler/parser.js
 /coverage/
 /dist/
-/tests/bench/results/
+/test-results/
 /tests/integration/*/dist/
 /spec/tmp/*

.oxfmtrc.json

@@ -1,28 +0,0 @@
-{
-  "$schema": "https://raw.githubusercontent.com/nicolo-ribaudo/oxfmt-config-schema/refs/heads/main/schema.json",
-  "singleQuote": true,
-  "tabWidth": 2,
-  "semi": true,
-  "trailingComma": "es5",
-  "printWidth": 80,
-  "ignorePatterns": [
-    ".rvmrc",
-    ".DS_Store",
-    "/tmp/",
-    "*.sublime-project",
-    "*.sublime-workspace",
-    "npm-debug.log",
-    "sauce_connect.log*",
-    ".idea",
-    "yarn-error.log",
-    "/coverage/",
-    ".nyc_output/",
-    "/dist/",
-    "/tests/integration/*/dist/",
-    "/spec/expected/",
-    "/spec/mustache",
-    "/spec/vendor",
-    "*.handlebars",
-    "*.hbs"
-  ]
-}

.oxlintrc.json

@@ -1,150 +0,0 @@
-{
-  "$schema": "https://raw.githubusercontent.com/oxc-project/oxc/main/npm/oxlint/configuration_schema.json",
-  "plugins": ["eslint", "typescript", "unicorn", "oxc", "node", "vitest"],
-  "categories": {
-    "correctness": "error"
-  },
-  "rules": {
-    "no-console": "warn",
-    "no-func-assign": "off",
-    "no-sparse-arrays": "off",
-
-    "default-case": "warn",
-    "guard-for-in": "warn",
-    "no-alert": "error",
-    "no-caller": "error",
-    "no-div-regex": "warn",
-    "no-eval": "error",
-    "no-extend-native": "error",
-    "no-extra-bind": "error",
-    "no-implied-eval": "error",
-    "no-iterator": "error",
-    "no-labels": "error",
-    "no-lone-blocks": "error",
-    "no-loop-func": "error",
-    "no-multi-str": "warn",
-    "no-global-assign": "error",
-    "no-new": "error",
-    "no-new-func": "error",
-    "no-new-wrappers": "error",
-    "no-proto": "error",
-    "no-return-assign": "error",
-    "no-script-url": "error",
-    "no-self-compare": "error",
-    "no-sequences": "error",
-    "no-throw-literal": "error",
-    "no-unused-expressions": "error",
-    "no-warning-comments": "warn",
-    "no-with": "error",
-    "radix": "error",
-
-    "no-label-var": "error",
-    "no-use-before-define": ["error", { "functions": false }],
-
-    "no-var": "error",
-
-    "node/no-process-env": "error"
-  },
-  "ignorePatterns": [
-    "tmp/",
-    "dist/",
-    "coverage/",
-    ".nyc_output/",
-    "handlebars-release.tgz",
-    "tests/integration/*/dist/",
-    "spec/expected/",
-    "spec/mustache",
-    "spec/vendor",
-    "node_modules",
-    "types/"
-  ],
-  "overrides": [
-    {
-      "files": ["lib/**/*.js"],
-      "env": {
-        "node": false,
-        "browser": true
-      }
-    },
-    {
-      "files": ["spec/**/*.js"],
-      "globals": {
-        "CompilerContext": "readonly",
-        "Handlebars": "writable",
-        "handlebarsEnv": "readonly",
-        "expectTemplate": "readonly",
-        "suite": "readonly",
-        "test": "readonly",
-        "testBoth": "readonly",
-        "raises": "readonly",
-        "deepEqual": "readonly",
-        "start": "readonly",
-        "stop": "readonly",
-        "ok": "readonly",
-        "vi": "readonly",
-        "strictEqual": "readonly",
-        "define": "readonly",
-        "expect": "readonly",
-        "beforeEach": "readonly",
-        "afterEach": "readonly",
-        "describe": "readonly",
-        "it": "readonly"
-      },
-      "rules": {
-        "no-var": "off",
-        "dot-notation": "off",
-        "vitest/no-conditional-tests": "off"
-      }
-    },
-    {
-      "files": ["tasks/**/*.js"],
-      "rules": {
-        "node/no-process-env": "off",
-        "prefer-const": "warn",
-        "dot-notation": "error"
-      }
-    },
-    {
-      "files": ["tasks/tests/**/*.js"],
-      "globals": {
-        "describe": "readonly",
-        "it": "readonly",
-        "expect": "readonly",
-        "beforeEach": "readonly",
-        "afterEach": "readonly",
-        "vi": "readonly"
-      }
-    },
-    {
-      "files": ["tests/bench/**/*.mjs"],
-      "rules": {
-        "no-console": "off"
-      }
-    },
-    {
-      "files": ["tests/integration/multi-nodejs-test/**/*.js"],
-      "rules": {
-        "no-console": "off",
-        "no-var": "off"
-      }
-    },
-    {
-      "files": ["tests/browser/**/*.js"],
-      "env": {
-        "browser": true
-      }
-    },
-    {
-      "files": [
-        "tests/integration/webpack-babel-test/src/**/*.js",
-        "tests/integration/webpack-test/src/**/*.js"
-      ],
-      "env": {
-        "browser": true
-      },
-      "rules": {
-        "no-var": "off"
-      }
-    }
-  ]
-}

.prettierignore

@@ -0,0 +1,22 @@
+.rvmrc
+.DS_Store
+/tmp/
+*.sublime-project
+*.sublime-workspace
+npm-debug.log
+sauce_connect.log*
+.idea
+yarn-error.log
+node_modules
+/handlebars-release.tgz
+.nyc_output
+
+# Generated files
+lib/handlebars/compiler/parser.js
+/coverage/
+/dist/
+/tests/integration/*/dist/
+
+# Third-party or files that must remain unchanged
+/spec/expected/
+/spec/vendor

.swcrc

@@ -1,8 +0,0 @@
-{
-  "$schema": "https://swc.rs/schema.json",
-  "module": {
-    "type": "commonjs",
-    "importInterop": "swc"
-  },
-  "sourceMaps": "inline"
-}

CONTRIBUTING.md

@@ -1,16 +1,10 @@
 # How to Contribute
 
-## Reporting Security Issues
-
-Please refer to our [Security Policy](https://github.com/handlebars-lang/handlebars.js/blob/master/SECURITY.md).
-
 ## Reporting Issues
 
-Please refer to our [FAQ](https://github.com/handlebars-lang/handlebars.js/blob/master/FAQ.md) for common issues that people run into.
+Please see our [FAQ](https://github.com/handlebars-lang/handlebars.js/blob/master/FAQ.md) for common issues that people run into.
 
-Should you run into other issues with the project, please don't hesitate to let us know by filing an [issue][issue]!
+Should you run into other issues with the project, please don't hesitate to let us know by filing an [issue][issue]! In general we are going to ask for an example of the problem failing, which can be as simple as a jsfiddle/jsbin/etc. We've put together a jsfiddle [template][jsfiddle] to ease this. (We will keep this link up to date as new releases occur, so feel free to check back here)
-
-In general, we are going to ask for an **example** of the problem failing, which can be as simple as a jsfiddle/jsbin/etc. We've put together a jsfiddle **[template][jsfiddle]** to ease this. (We will keep this link up to date as new releases occur, so feel free to check back here).
 
 Pull requests containing only failing tests demonstrating the issue are welcomed and this also helps ensure that your issue won't regress in the future once it's fixed.
 
@@ -18,8 +12,9 @@ Documentation issues on the [handlebarsjs.com](https://handlebarsjs.com) site sh
 
 ## Branches
 
-- The branch `master` contains the current development version (v5).
+- The branch `4.x` contains the currently released version. Bugfixes should be made in this branch.
-- The branch `4.x` contains the previous stable version. Only critical bugfixes are backported there.
+- The branch `master` contains the next version. A release date is not yet specified. Maintainers
+  should merge the branch `4.x` into the master branch regularly.
 
 ## Pull Requests
 
@@ -35,13 +30,21 @@ Generally we like to see pull requests that
 
 ## Building
 
-To build Handlebars.js you'll need Node.js installed.
+To build Handlebars.js you'll need a few things installed.
+
+- Node.js
+- [Grunt](http://gruntjs.com/getting-started)
 
 Before building, you need to make sure that the Git submodule `spec/mustache` is included (i.e. the directory `spec/mustache` should not be empty). To include it, if using Git version 1.6.5 or newer, use `git clone --recursive` rather than `git clone`. Or, if you already cloned without `--recursive`, use `git submodule update --init`.
 
 Project dependencies may be installed via `npm install`.
 
-To build Handlebars.js from scratch, run `npm run build` in the root of the project. That will compile CJS modules via SWC and bundle UMD distributions via rspack, outputting results to the dist/ folder. To run tests, use `npm test`.
+To build Handlebars.js from scratch, you'll want to run `grunt`
+in the root of the project. That will build Handlebars and output the
+results to the dist/ folder. To re-run tests, run `grunt test` or `npm test`.
+You can also run our set of benchmarks with `grunt bench`.
+
+The `grunt dev` implements watching for tests and allows for in browser testing at `http://localhost:9999/spec/`.
 
 If you notice any problems, please report them to the GitHub issue tracker at
 [http://github.com/handlebars-lang/handlebars.js/issues](http://github.com/handlebars-lang/handlebars.js/issues).
@@ -70,36 +73,116 @@ npm test
 
 ## Linting and Formatting
 
-Handlebars uses `oxlint` for linting, `oxfmt` for formatting, and `eslint` (with `eslint-plugin-compat`) for browser API compatibility checks.
+Handlebars uses `eslint` to enforce best-practices and `prettier` to auto-format files.
-Committed files are linted and formatted in a pre-commit hook.
+We do linting and formatting in two phases:
+
+- Committed files are linted and formatted in a pre-commit hook. In this stage eslint-errors are forbidden,
+  while warnings are allowed.
+- The GitHub CI job also lints all files and checks if they are formatted correctly. In this stage, warnings
+  are forbidden.
 
 You can use the following scripts to make sure that the CI job does not fail:
 
-- **npm run lint** will run all linters and fail on warnings
+- **npm run lint** will run `eslint` and fail on warnings
-- **npm run format** will format all files
+- **npm run format** will run `prettier` on all files
-- **npm run check-before-pull-request** will perform all checks that our CI job does, excluding integration tests.
+- **npm run check-before-pull-request** will perform all most checks that our CI job does in its build-job, excluding the "integration-test".
-- **npm run test:integration** will run integration tests (bundler compatibility with webpack, rollup, etc.)
+- **npm run test:integration** will run integration tests (using old NodeJS versions and integrations with webpack, babel and so on)
-  These tests only work on Linux.
+  These tests only work on a Linux-machine with `nvm` installed (for running tests in multiple versions of NodeJS).
 
 ## Releasing the latest version
 
 Before attempting the release Handlebars, please make sure that you have the following authorizations:
 
-- Push-access to `handlebars-lang/handlebars.js`
+- Push-access to [handlebars-lang/handlebars.js](https://github.com/handlebars-lang/handlebars.js/)
-- Publishing rights on npmjs.com for the `handlebars` package
+- Publishing rights on npmjs.com for the [handlebars](https://www.npmjs.com/package/handlebars) package
-- Publishing rights on gemfury for the `handlebars-source` package
+- Publishing rights on rubygems for the [handlebars-source](https://rubygems.org/gems/handlebars-source) package
-- Push-access to the repo for legacy package managers: `components/handlebars`
+- Push-access to the repo for legacy package managers: [components/handlebars.js](https://github.com/components/handlebars.js)
-- Push-access to the production-repo of the handlebars site: `handlebars-lang/handlebarsjs.com-github-pages`
+- Push-access to the production-repo of the handlebars site: [handlebars-lang/docs](https://github.com/handlebars-lang/docs)
 
 _When releasing a previous version of Handlebars, please look into the CONTRIBUNG.md in the corresponding branch._
 
-A full release may be completed with the following:
+A full release via Docker may be completed with the following:
 
-```
+1. Create a `Dockerfile` in this folder for releasing
-npm ci
+    ```Dockerfile
-npm run build
+    FROM node:10-slim
-npm publish
+    
-```
+    ENV EDITOR=vim
+    
+    # Update stretch repositories
+    RUN sed -i -e 's/deb.debian.org/archive.debian.org/g' \
+    -e 's|security.debian.org|archive.debian.org/|g' \
+    -e '/stretch-updates/d' /etc/apt/sources.list
+    
+    # Install release dependencies
+    RUN apt-get update
+    RUN apt-get install -y git vim
+    
+    # Work around deprecated npm dependency install via unauthenticated git-protocol:
+    # https://github.com/kpdecker/generator-release/blob/87aab9b84c9f083635c3fcc822f18acce1f48736/package.json#L31
+    RUN git config --system url."https://github.com/".insteadOf git://github.com/
+    
+    # Configure git
+    RUN git config --system user.email "release@handlebarsjs.com"
+    RUN git config --system user.name "handlebars-lang"
+    
+    RUN mkdir /home/node/.config
+    RUN mkdir /home/node/.ssh
+    RUN mkdir /home/node/tmp
+    
+    # Generate config for yo generator-release:
+    # https://github.com/kpdecker/generator-release#example
+    # You have to add a valid GitHub access token! (Used for reading issues and pull requests.)
+    RUN echo "module.exports = {\n  auth: 'oauth',\n  token: 'GitHub personal access token'\n};" > /home/node/.config/generator-release
+    RUN chown -R node:node /home/node/.config
+    RUN chown -R node:node /home/node/.ssh
+    RUN chown -R node:node /home/node/tmp
+    
+    # Add the generated key to GitHub: https://github.com/settings/keys
+    RUN ssh-keygen -q -t ed25519 -N '' -f /home/node/.ssh/id_ed25519 -C "release@handlebarsjs.com"
+    RUN chmod 0600 /home/node/.ssh/id_ed25519*
+    RUN chown node:node /home/node/.ssh/id_ed25519*
+    ```
+2. Build and run the Docker image
+    ```bash
+    docker build --tag handlebars:release .
+    docker run --rm --interactive --tty \
+      --volume $PWD:/app \
+      --workdir /app \
+      --user $(id -u):$(id -g) \
+      --env NPM_CONFIG_PREFIX=/home/node/.npm-global \
+      handlebars:release bash -c 'export PATH=$PATH:/home/node/.npm-global/bin; bash'
+    ```
+   * Add SSH key to GitHub: `cat /home/node/.ssh/id_ed25519.pub` (https://github.com/settings/keys)
+   * Add GitHub API token: `vi /home/node/.config/generator-release`
+   * Execute the following steps:
+     ```bash
+     npm install
+     npm install -g yo@1 grunt@1 generator-release
+     npm run release
+     # Warning! This step will collect data from GitHub, bump the version,
+     # create a new commit, create a new tag and push it to GitHub.
+     # https://github.com/kpdecker/generator-release?tab=readme-ov-file#usage
+     yo release
+     npm login
+     npm publish
+     yo release:publish components handlebars.js dist/components/
+     ```
+6. Publish Ruby `handlebars-source` gem:
+    ```bash
+    docker run --rm --interactive --tty \
+     --volume $PWD:/app \
+     --workdir /app \
+     ruby:3.2-slim bash
+    ```
+   * Execute the following steps:
+     ```bash
+     cd dist/components/
+     gem build handlebars-source.gemspec
+     gem push handlebars-source-*.gem
+     ```
+
+### After the release
 
 After the release, you should check that all places have really been updated. Especially verify that the `latest`-tags
 in those places still point to the latest version
@@ -120,4 +203,4 @@ in the `handlebars-lang/docs`-repo).
 [generator-release]: https://github.com/walmartlabs/generator-release
 [pull-request]: https://github.com/handlebars-lang/handlebars.js/pull/new/master
 [issue]: https://github.com/handlebars-lang/handlebars.js/issues/new
-[jsfiddle]: https://jsfiddle.net/4nbwjaqz/4/
+[jsfiddle]: https://jsfiddle.net/9D88g/180/

FAQ.md

@@ -1,54 +1,62 @@
 # Frequently Asked Questions
 
-## How can I file a bug report:
+1. How can I file a bug report:
 
-See our guidelines on [reporting issues](https://github.com/handlebars-lang/handlebars.js/blob/master/CONTRIBUTING.md#reporting-issues).
+  See our guidelines on [reporting issues](https://github.com/handlebars-lang/handlebars.js/blob/master/CONTRIBUTING.md#reporting-issues).
 
-## Why isn't my Mustache template working?
+1. Why isn't my Mustache template working?
 
-Handlebars deviates from Mustache slightly on a few behaviors. These variations are documented in our [readme](https://github.com/handlebars-lang/handlebars.js#differences-between-handlebarsjs-and-mustache).
+  Handlebars deviates from Mustache slightly on a few behaviors. These variations are documented in our [readme](https://github.com/handlebars-lang/handlebars.js#differences-between-handlebarsjs-and-mustache).
 
-## Why is it slower when compiling?
+1. Why is it slower when compiling?
 
-The Handlebars compiler must parse the template and construct a JavaScript program which can then be run. Under some environments such as older mobile devices this can have a performance impact which can be avoided by precompiling. Generally it's recommended that precompilation and the runtime library be used on all clients.
+  The Handlebars compiler must parse the template and construct a JavaScript program which can then be run. Under some environments such as older mobile devices this can have a performance impact which can be avoided by precompiling. Generally it's recommended that precompilation and the runtime library be used on all clients.
 
-## Why doesn't this work with Content Security Policy restrictions?
+1. Why doesn't this work with Content Security Policy restrictions?
 
-When not using the precompiler, Handlebars generates a dynamic function for each template which can cause issues with pages that have enabled Content Policy. It's recommended that templates are precompiled or the `unsafe-eval` policy is enabled for sites that must generate dynamic templates at runtime.
+  When not using the precompiler, Handlebars generates a dynamic function for each template which can cause issues with pages that have enabled Content Policy. It's recommended that templates are precompiled or the `unsafe-eval` policy is enabled for sites that must generate dynamic templates at runtime.
 
-## How can I include script tags in my template?
+1. How can I include script tags in my template?
 
-If loading the template via an inlined `<script type="text/x-handlebars">` tag then you may need to break up the script tag with an empty comment to avoid browser parser errors:
+  If loading the template via an inlined `<script type="text/x-handlebars">` tag then you may need to break up the script tag with an empty comment to avoid browser parser errors:
 
-```html
+  ```html
-<script type="text/x-handlebars">
+  <script type="text/x-handlebars">
-  foo
+    foo
-  <scr{{!}}ipt src="bar"></scr{{!}}ipt>
+    <scr{{!}}ipt src="bar"></scr{{!}}ipt>
-</script>
+  </script>
-```
+  ```
 
-It's generally recommended that templates are served through external, precompiled, files, which do not suffer from this issue.
+  It's generally recommended that templates are served through external, precompiled, files, which do not suffer from this issue.
 
-## Why are my precompiled scripts throwing exceptions?
+1. Why are my precompiled scripts throwing exceptions?
 
-When using the precompiler, it's important that a supporting version of the Handlebars runtime be loaded on the target page. In version 1.x there were rudimentary checks to compare the version but these did not always work. This is fixed under 2.x but the version checking does not work between these two versions. If you see unexpected errors such as `undefined is not a function` or similar, please verify that the same version is being used for both the precompiler and the client. This can be checked via:
+  When using the precompiler, it's important that a supporting version of the Handlebars runtime be loaded on the target page. In version 1.x there were rudimentary checks to compare the version but these did not always work. This is fixed under 2.x but the version checking does not work between these two versions. If you see unexpected errors such as `undefined is not a function` or similar, please verify that the same version is being used for both the precompiler and the client. This can be checked via:
 
-```sh
+  ```sh
-handlebars --version
+  handlebars --version
-```
+  ```
 
-If using the integrated precompiler and
+  If using the integrated precompiler and
 
-```javascript
+  ```javascript
-console.log(Handlebars.VERSION);
+  console.log(Handlebars.VERSION);
-```
+  ```
 
-On the client side.
+  On the client side.
 
-We include the built client libraries in the npm package for those who want to be certain that they are using the same client libraries as the compiler.
+  We include the built client libraries in the npm package for those who want to be certain that they are using the same client libraries as the compiler.
 
-Should these match, please file an issue with us, per our [issue filing guidelines](https://github.com/handlebars-lang/handlebars.js/blob/master/CONTRIBUTING.md#reporting-issues).
+  Should these match, please file an issue with us, per our [issue filing guidelines](https://github.com/handlebars-lang/handlebars.js/blob/master/CONTRIBUTING.md#reporting-issues).
 
-## How do I load the runtime library when using AMD?
+1. Why doesn't IE like the `default` name in the AMD module?
 
-The `handlebars.runtime.js` file includes a UMD build, which exposes the library as both the module root and the `default` field for compatibility.
+  Some browsers such as particular versions of IE treat `default` as a reserved word in JavaScript source files. To safely use this you need to reference this via the `Handlebars['default']` lookup method. This is an unfortunate side effect of the shims necessary to backport the Handlebars ES6 code to all current browsers.
+
+1. How do I load the runtime library when using AMD?
+
+  There are two options for loading under AMD environments. The first is to use the `handlebars.runtime.amd.js` file. This may require a [path mapping](https://github.com/handlebars-lang/handlebars.js/blob/master/spec/amd-runtime.html#L31) as well as access via the `default` field.
+
+  The other option is to load the `handlebars.runtime.js` UMD build, which might not require path configuration and exposes the library as both the module root and the `default` field for compatibility.
+
+  If not using ES6 transpilers or accessing submodules in the build the former option should be sufficient for most use cases.

Gruntfile.js

@@ -0,0 +1,237 @@
+/* eslint-disable no-process-env */
+module.exports = function(grunt) {
+  grunt.initConfig({
+    pkg: grunt.file.readJSON('package.json'),
+
+    clean: [
+      'tmp',
+      'dist',
+      'lib/handlebars/compiler/parser.js',
+      '/tests/integration/**/node_modules'
+    ],
+
+    copy: {
+      dist: {
+        options: {
+          processContent: function(content) {
+            return (
+              grunt.template.process(
+                '/**!\n\n @license\n <%= pkg.name %> v<%= pkg.version %>\n\n<%= grunt.file.read("LICENSE") %>\n*/\n'
+              ) + content
+            );
+          }
+        },
+        files: [{ expand: true, cwd: 'dist/', src: ['*.js'], dest: 'dist/' }]
+      },
+      cdnjs: {
+        files: [
+          { expand: true, cwd: 'dist/', src: ['*.js'], dest: 'dist/cdnjs' }
+        ]
+      },
+      components: {
+        files: [
+          {
+            expand: true,
+            cwd: 'components/',
+            src: ['**'],
+            dest: 'dist/components'
+          },
+          { expand: true, cwd: 'dist/', src: ['*.js'], dest: 'dist/components' }
+        ]
+      }
+    },
+
+    babel: {
+      options: {
+        sourceMaps: 'inline',
+        loose: ['es6.modules'],
+        auxiliaryCommentBefore: 'istanbul ignore next'
+      },
+      amd: {
+        options: {
+          modules: 'amd'
+        },
+        files: [
+          {
+            expand: true,
+            cwd: 'lib/',
+            src: '**/!(index).js',
+            dest: 'dist/amd/'
+          }
+        ]
+      },
+
+      cjs: {
+        options: {
+          modules: 'common'
+        },
+        files: [
+          {
+            cwd: 'lib/',
+            expand: true,
+            src: '**/!(index).js',
+            dest: 'dist/cjs/'
+          }
+        ]
+      }
+    },
+    webpack: {
+      options: {
+        context: __dirname,
+        module: {
+          loaders: [
+            // the optional 'runtime' transformer tells babel to require the runtime instead of inlining it.
+            {
+              test: /\.jsx?$/,
+              exclude: /node_modules/,
+              loader:
+                'babel-loader?optional=runtime&loose=es6.modules&auxiliaryCommentBefore=istanbul%20ignore%20next'
+            }
+          ]
+        },
+        output: {
+          path: 'dist/',
+          library: 'Handlebars',
+          libraryTarget: 'umd'
+        }
+      },
+      handlebars: {
+        entry: './lib/handlebars.js',
+        output: {
+          filename: 'handlebars.js'
+        }
+      },
+      runtime: {
+        entry: './lib/handlebars.runtime.js',
+        output: {
+          filename: 'handlebars.runtime.js'
+        }
+      }
+    },
+
+    requirejs: {
+      options: {
+        optimize: 'none',
+        baseUrl: 'dist/amd/'
+      },
+      dist: {
+        options: {
+          name: 'handlebars',
+          out: 'dist/handlebars.amd.js'
+        }
+      },
+      runtime: {
+        options: {
+          name: 'handlebars.runtime',
+          out: 'dist/handlebars.runtime.amd.js'
+        }
+      }
+    },
+
+    uglify: {
+      options: {
+        mangle: true,
+        compress: true,
+        preserveComments: /(?:^!|@(?:license|preserve|cc_on))/
+      },
+      dist: {
+        files: [
+          {
+            cwd: 'dist/',
+            expand: true,
+            src: ['handlebars*.js', '!*.min.js'],
+            dest: 'dist/',
+            rename: function(dest, src) {
+              return dest + src.replace(/\.js$/, '.min.js');
+            }
+          }
+        ]
+      }
+    },
+
+    concat: {
+      tests: {
+        src: ['spec/!(require).js'],
+        dest: 'tmp/tests.js'
+      }
+    },
+
+    connect: {
+      server: {
+        options: {
+          base: '.',
+          hostname: '*',
+          port: 9999
+        }
+      }
+    },
+
+    shell: {
+      integrationTests: {
+        command: './tests/integration/run-integration-tests.sh'
+      }
+    },
+
+    watch: {
+      scripts: {
+        options: {
+          atBegin: true
+        },
+
+        files: ['src/*', 'lib/**/*.js', 'spec/**/*.js'],
+        tasks: ['on-file-change']
+      }
+    }
+  });
+
+  // Load tasks from npm
+  grunt.loadNpmTasks('grunt-contrib-clean');
+  grunt.loadNpmTasks('grunt-contrib-concat');
+  grunt.loadNpmTasks('grunt-contrib-connect');
+  grunt.loadNpmTasks('grunt-contrib-copy');
+  grunt.loadNpmTasks('grunt-contrib-requirejs');
+  grunt.loadNpmTasks('grunt-contrib-uglify');
+  grunt.loadNpmTasks('grunt-contrib-watch');
+  grunt.loadNpmTasks('grunt-babel');
+  grunt.loadNpmTasks('grunt-shell');
+  grunt.loadNpmTasks('grunt-webpack');
+
+  grunt.task.loadTasks('tasks');
+
+  grunt.registerTask('node', ['babel:cjs']);
+  grunt.registerTask('amd', ['babel:amd', 'requirejs']);
+  grunt.registerTask('globals', ['webpack']);
+  grunt.registerTask('release', 'Build final packages', [
+    'uglify',
+    'test:min',
+    'copy:dist',
+    'copy:components',
+    'copy:cdnjs'
+  ]);
+
+  // Requires secret properties from .travis.yaml
+  grunt.registerTask('extensive-tests-and-publish-to-aws', [
+    'default',
+    'shell:integrationTests',
+    'metrics',
+    'publish-to-aws'
+  ]);
+
+  grunt.registerTask('on-file-change', ['build', 'concat:tests', 'test']);
+
+  // === Primary tasks ===
+  grunt.registerTask('dev', ['clean', 'connect', 'watch']);
+  grunt.registerTask('default', ['clean', 'build', 'test', 'release']);
+  grunt.registerTask('test', ['test:bin', 'test:cov']);
+  grunt.registerTask('bench', ['metrics']);
+  grunt.registerTask('prepare', ['build', 'concat:tests']);
+  grunt.registerTask(
+    'build',
+    'Builds a distributable version of the current project',
+    ['parser', 'node', 'amd', 'globals']
+  );
+  grunt.registerTask('integration-tests', [
+    'default',
+    'shell:integrationTests'
+  ]);
+};

README.markdown

@@ -0,0 +1,167 @@
+[![CI Build Status](https://github.com/handlebars-lang/handlebars.js/actions/workflows/ci.yml/badge.svg)](https://github.com/handlebars-lang/handlebars.js/actions/workflows/ci.yml)
+[![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/handlebars/badge?style=rounded)](https://www.jsdelivr.com/package/npm/handlebars)
+[![npm downloads](https://badgen.net/npm/dm/handlebars)](https://www.npmjs.com/package/handlebars)
+[![npm version](https://badgen.net/npm/v/handlebars)](https://www.npmjs.com/package/handlebars)
+[![Bundle size](https://badgen.net/bundlephobia/minzip/handlebars?label=minified%20%2B%20gzipped)](https://bundlephobia.com/package/handlebars)
+[![Install size](https://packagephobia.com/badge?p=handlebars)](https://packagephobia.com/result?p=handlebars)
+
+Handlebars.js
+=============
+
+Handlebars provides the power necessary to let you build **semantic templates** effectively with no frustration.
+Handlebars is largely compatible with Mustache templates. In most cases it is possible to swap out Mustache with Handlebars and continue using your current templates.
+
+Checkout the official Handlebars docs site at
+[handlebarsjs.com](https://handlebarsjs.com) and try our [live demo](https://handlebarsjs.com/playground.html).
+
+Installing
+----------
+
+See our [installation documentation](https://handlebarsjs.com/installation/).
+
+Usage
+-----
+In general, the syntax of Handlebars.js templates is a superset
+of Mustache templates. For basic syntax, check out the [Mustache
+manpage](https://mustache.github.io/mustache.5.html).
+
+Once you have a template, use the `Handlebars.compile` method to compile
+the template into a function. The generated function takes a context
+argument, which will be used to render the template.
+
+```js
+var source = "<p>Hello, my name is {{name}}. I am from {{hometown}}. I have " +
+             "{{kids.length}} kids:</p>" +
+             "<ul>{{#kids}}<li>{{name}} is {{age}}</li>{{/kids}}</ul>";
+var template = Handlebars.compile(source);
+
+var data = { "name": "Alan", "hometown": "Somewhere, TX",
+             "kids": [{"name": "Jimmy", "age": "12"}, {"name": "Sally", "age": "4"}]};
+var result = template(data);
+
+// Would render:
+// <p>Hello, my name is Alan. I am from Somewhere, TX. I have 2 kids:</p>
+// <ul>
+//   <li>Jimmy is 12</li>
+//   <li>Sally is 4</li>
+// </ul>
+```
+
+Full documentation and more examples are at [handlebarsjs.com](https://handlebarsjs.com/).
+
+Precompiling Templates
+----------------------
+
+Handlebars allows templates to be precompiled and included as javascript code rather than the handlebars template allowing for faster startup time. Full details are located [here](https://handlebarsjs.com/installation/precompilation.html).
+
+Differences Between Handlebars.js and Mustache
+----------------------------------------------
+Handlebars.js adds a couple of additional features to make writing
+templates easier and also changes a tiny detail of how partials work.
+
+- [Nested Paths](https://handlebarsjs.com/guide/expressions.html#path-expressions)
+- [Helpers](https://handlebarsjs.com/guide/expressions.html#helpers)
+- [Block Expressions](https://handlebarsjs.com/guide/block-helpers.html#basic-blocks)
+- [Literal Values](https://handlebarsjs.com/guide/expressions.html#literal-segments)
+- [Delimited Comments](https://handlebarsjs.com/guide/#template-comments)
+
+Block expressions have the same syntax as mustache sections but should not be confused with one another. Sections are akin to an implicit `each` or `with` statement depending on the input data and helpers are explicit pieces of code that are free to implement whatever behavior they like. The [mustache spec](https://mustache.github.io/mustache.5.html) defines the exact behavior of sections. In the case of name conflicts, helpers are given priority.
+
+### Compatibility
+
+There are a few Mustache behaviors that Handlebars does not implement.
+- Handlebars deviates from Mustache slightly in that it does not perform recursive lookup by default. The compile time `compat` flag must be set to enable this functionality. Users should note that there is a performance cost for enabling this flag. The exact cost varies by template, but it's recommended that performance sensitive operations should avoid this mode and instead opt for explicit path references.
+- The optional Mustache-style lambdas are not supported. Instead Handlebars provides its own lambda resolution that follows the behaviors of helpers.
+- Alternative delimiters are not supported.
+
+
+Supported Environments
+----------------------
+
+Handlebars has been designed to work in any ECMAScript 3 environment. This includes
+
+- Node.js
+- Chrome
+- Firefox
+- Safari 5+
+- Opera 11+
+- IE 6+
+
+Older versions and other runtimes are likely to work but have not been formally
+tested. The compiler requires `JSON.stringify` to be implemented natively or via a polyfill. If using the precompiler this is not necessary.
+
+Performance
+-----------
+
+In a rough performance test, precompiled Handlebars.js templates (in
+the original version of Handlebars.js) rendered in about half the
+time of Mustache templates. It would be a shame if it were any other
+way, since they were precompiled, but the difference in architecture
+does have some big performance advantages. Justin Marney, a.k.a.
+[gotascii](http://github.com/gotascii), confirmed that with an
+[independent test](http://sorescode.com/2010/09/12/benchmarks.html). The
+rewritten Handlebars (current version) is faster than the old version,
+with many performance tests being 5 to 7 times faster than the Mustache equivalent.
+
+
+Upgrading
+---------
+
+See [release-notes.md](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md) for upgrade notes.
+
+Known Issues
+------------
+
+See [FAQ.md](https://github.com/handlebars-lang/handlebars.js/blob/master/FAQ.md) for known issues and common pitfalls.
+
+
+Handlebars in the Wild
+----------------------
+
+* [Assemble](http://assemble.io), by [@jonschlinkert](https://github.com/jonschlinkert)
+  and [@doowb](https://github.com/doowb), is a static site generator that uses Handlebars.js
+  as its template engine.
+* [Cory](https://github.com/leo/cory), by [@leo](https://github.com/leo), is another tiny static site generator
+* [CoSchedule](http://coschedule.com) An editorial calendar for WordPress that uses Handlebars.js
+* [dashbars](https://github.com/pismute/dashbars) A modern helper library for Handlebars.js.
+* [Ember.js](http://www.emberjs.com) makes Handlebars.js the primary way to
+  structure your views, also with automatic data binding support.
+* [Ghost](https://ghost.org/) Just a blogging platform.
+* [handlebars_assets](http://github.com/leshill/handlebars_assets): A Rails Asset Pipeline gem
+  from Les Hill (@leshill).
+* [handlebars-helpers](https://github.com/assemble/handlebars-helpers) is an extensive library
+  with 100+ handlebars helpers.
+* [handlebars-layouts](https://github.com/shannonmoeller/handlebars-layouts) is a set of helpers which implement extendible and embeddable layout blocks as seen in other popular templating languages.
+* [hbs](http://github.com/donpark/hbs): An Express.js view engine adapter for Handlebars.js,
+  from Don Park.
+* [koa-hbs](https://github.com/jwilm/koa-hbs): [koa](https://github.com/koajs/koa) generator based
+  renderer for Handlebars.js.
+* [jblotus](http://github.com/jblotus) created [http://tryhandlebarsjs.com](http://tryhandlebarsjs.com)
+  for anyone who would like to try out Handlebars.js in their browser.
+* [jQuery plugin](http://71104.github.io/jquery-handlebars/): allows you to use
+  Handlebars.js with [jQuery](http://jquery.com/).
+* [Lumbar](http://walmartlabs.github.io/lumbar) provides easy module-based template management for
+  handlebars projects.
+* [Marionette.Handlebars](https://github.com/hashchange/marionette.handlebars) adds support for Handlebars and Mustache templates to Marionette.
+* [sammy.js](http://github.com/quirkey/sammy) by Aaron Quint, a.k.a. quirkey,
+  supports Handlebars.js as one of its template plugins.
+* [SproutCore](http://www.sproutcore.com) uses Handlebars.js as its main
+  templating engine, extending it with automatic data binding support.
+* [YUI](http://yuilibrary.com/yui/docs/handlebars/) implements a port of handlebars
+* [Swag](https://github.com/elving/swag) by [@elving](https://github.com/elving) is a growing collection of helpers for handlebars.js. Give your handlebars.js templates some swag son!
+* [DOMBars](https://github.com/blakeembrey/dombars) is a DOM-based templating engine built on the Handlebars parser and runtime **DEPRECATED**
+* [promised-handlebars](https://github.com/nknapp/promised-handlebars) is a wrapper for Handlebars that allows helpers to return Promises.
+* [just-handlebars-helpers](https://github.com/leapfrogtechnology/just-handlebars-helpers) A fully tested lightweight package with common Handlebars helpers.
+
+External Resources
+------------------
+
+* [Gist about Synchronous and asynchronous loading of external handlebars templates](https://gist.github.com/2287070)
+
+Have a project using Handlebars? Send us a [pull request][pull-request]!
+
+License
+-------
+Handlebars.js is released under the MIT license.
+
+[pull-request]: https://github.com/handlebars-lang/handlebars.js/pull/new/master

README.md

@@ -1,198 +0,0 @@
-[![CI Build Status](https://github.com/handlebars-lang/handlebars.js/actions/workflows/ci.yml/badge.svg)](https://github.com/handlebars-lang/handlebars.js/actions/workflows/ci.yml)
-[![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/handlebars/badge?style=rounded)](https://www.jsdelivr.com/package/npm/handlebars)
-[![npm downloads](https://badgen.net/npm/dm/handlebars)](https://www.npmjs.com/package/handlebars)
-[![npm version](https://badgen.net/npm/v/handlebars)](https://www.npmjs.com/package/handlebars)
-[![Bundle size](https://badgen.net/bundlephobia/minzip/handlebars?label=minified%20%2B%20gzipped)](https://bundlephobia.com/package/handlebars)
-[![Install size](https://packagephobia.com/badge?p=handlebars)](https://packagephobia.com/result?p=handlebars)
-
-# Handlebars.js
-
-Handlebars provides the power necessary to let you build **semantic templates** effectively with no frustration.
-Handlebars is largely compatible with Mustache templates. In most cases it is possible to swap out Mustache with Handlebars and continue using your current templates.
-
-Checkout the official Handlebars docs site at
-[handlebarsjs.com](https://handlebarsjs.com) and try our [live demo](https://handlebarsjs.com/playground.html).
-
-## Installing
-
-See our [installation documentation](https://handlebarsjs.com/guide/installation/).
-
-## Usage
-
-In general, the syntax of Handlebars.js templates is a superset
-of Mustache templates. For basic syntax, check out the [Mustache
-manpage](https://mustache.github.io/mustache.5.html).
-
-Once you have a template, use the `Handlebars.compile` method to compile
-the template into a function. The generated function takes a context
-argument, which will be used to render the template.
-
-```js
-var source =
-  '<p>Hello, my name is {{name}}. I am from {{hometown}}. I have ' +
-  '{{kids.length}} kids:</p>' +
-  '<ul>{{#kids}}<li>{{name}} is {{age}}</li>{{/kids}}</ul>';
-var template = Handlebars.compile(source);
-
-var data = {
-  name: 'Alan',
-  hometown: 'Somewhere, TX',
-  kids: [
-    { name: 'Jimmy', age: '12' },
-    { name: 'Sally', age: '4' },
-  ],
-};
-var result = template(data);
-
-// Would render:
-// <p>Hello, my name is Alan. I am from Somewhere, TX. I have 2 kids:</p>
-// <ul>
-//   <li>Jimmy is 12</li>
-//   <li>Sally is 4</li>
-// </ul>
-```
-
-Full documentation and more examples are at [handlebarsjs.com](https://handlebarsjs.com/).
-
-## Precompiling Templates
-
-Handlebars allows templates to be precompiled and included as javascript code rather than the handlebars template allowing for faster startup time. Full details are located [here](https://handlebarsjs.com/guide/installation/precompilation.html).
-
-## Differences Between Handlebars.js and Mustache
-
-Handlebars.js adds a couple of additional features to make writing
-templates easier and also changes a tiny detail of how partials work.
-
-- [Nested Paths](https://handlebarsjs.com/guide/expressions.html#path-expressions)
-- [Helpers](https://handlebarsjs.com/guide/expressions.html#helpers)
-- [Block Expressions](https://handlebarsjs.com/guide/block-helpers.html#basic-blocks)
-- [Literal Values](https://handlebarsjs.com/guide/expressions.html#literal-segments)
-- [Delimited Comments](https://handlebarsjs.com/guide/#template-comments)
-
-Block expressions have the same syntax as mustache sections but should not be confused with one another. Sections are akin to an implicit `each` or `with` statement depending on the input data and helpers are explicit pieces of code that are free to implement whatever behavior they like. The [mustache spec](https://mustache.github.io/mustache.5.html) defines the exact behavior of sections. In the case of name conflicts, helpers are given priority.
-
-### Compatibility
-
-There are a few Mustache behaviors that Handlebars does not implement.
-
-- Handlebars deviates from Mustache slightly in that it does not perform recursive lookup by default. The compile time `compat` flag must be set to enable this functionality. Users should note that there is a performance cost for enabling this flag. The exact cost varies by template, but it's recommended that performance sensitive operations should avoid this mode and instead opt for explicit path references.
-- The optional Mustache-style lambdas are not supported. Instead Handlebars provides its own lambda resolution that follows the behaviors of helpers.
-- Handlebars does not allow space between the opening `{{` and a command character such as `#`, `/` or `>`. The command character must immediately follow the braces, so for example `{{> partial }}` is allowed but `{{ > partial }}` is not.
-- Alternative delimiters are not supported.
-
-## Supported Environments
-
-Handlebars has been designed to work in any ECMAScript 2020 environment. This includes
-
-- Node.js
-- Chrome
-- Firefox
-- Safari
-- Edge
-
-If you need to support older environments, use Handlebars version 4.
-
-## Performance
-
-In a rough performance test, precompiled Handlebars.js templates (in
-the original version of Handlebars.js) rendered in about half the
-time of Mustache templates. It would be a shame if it were any other
-way, since they were precompiled, but the difference in architecture
-does have some big performance advantages. Justin Marney, a.k.a.
-[gotascii](http://github.com/gotascii), confirmed that with an
-[independent test](http://sorescode.com/2010/09/12/benchmarks.html). The
-rewritten Handlebars (current version) is faster than the old version,
-with many performance tests being 5 to 7 times faster than the Mustache equivalent.
-
-### Benchmarks
-
-The project includes a comprehensive benchmark suite (powered by [tinybench](https://github.com/tinylibs/tinybench)) that measures compilation, execution, precompilation, and end-to-end performance across templates of varying size and complexity.
-
-```bash
-# Run benchmarks (auto-labels with current git branch)
-npm run bench
-
-# Run with a custom label
-npm run bench -- --label my-optimization
-
-# Filter templates by name (regex, case-insensitive)
-npm run bench -- --grep "complex|recursive"
-
-# Run only specific sections (regex, case-insensitive)
-npm run bench -- --section precompil
-npm run bench -- --section "compilation|precompil"
-
-# Compare results
-npm run bench:compare
-
-# Or specify files explicitly
-npm run bench:compare -- bench/results/bench-*-main.md bench/results/bench-*-feat.md
-```
-
-Results are saved as timestamped Markdown files in `bench/results/`. Each report includes ops/sec, avg latency, p50/p75/p99 percentiles, and sample counts.
-
-Typical workflow for comparing branches:
-
-```bash
-git checkout main && npm run bench
-git checkout my-feature && npm run bench
-npm run bench:compare
-```
-
-When run without arguments, `bench:compare` auto-selects two result files: if a file labelled "main" exists it is always used as the baseline, otherwise the older file is the baseline. The comparison uses p75 latency for the diff to filter outliers, and marks changes with `!` (>2%) and `!!` (>5%).
-
-## Upgrading
-
-See [release-notes.md](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md) for upgrade notes.
-
-If you are using Handlebars in production, please regularly look for issues labeled
-[possibly breaking](https://github.com/handlebars-lang/handlebars.js/issues?q=is%3Aopen+is%3Aissue+label%3A%22possibly+breaking%22).
-If this label is applied to an issue, it means that the requested change is probably not a breaking change,
-but since Handlebars is widely in use by a lot of people, there's always a chance that it breaks somebody's build.
-
-## Known Issues
-
-See [FAQ.md](https://github.com/handlebars-lang/handlebars.js/blob/master/FAQ.md) for known issues and common pitfalls.
-
-## Handlebars in the Wild
-
-- [apiDoc](https://github.com/apidoc/apidoc) apiDoc uses handlebars as parsing engine for api documentation view generation.
-- [Assemble](https://assemble.io), by [@jonschlinkert](https://github.com/jonschlinkert) and [@doowb](https://github.com/doowb), is a static site generator that uses Handlebars.js as its template engine.
-- [CoSchedule](https://coschedule.com) An editorial calendar for WordPress that uses Handlebars.js.
-- [Ember.js](https://www.emberjs.com) makes Handlebars.js the primary way to structure your views, also with automatic data binding support.
-- [express-handlebars](https://github.com/express-handlebars/express-handlebars) A Handlebars view engine for Express which doesn't suck.
-- [express-hbs](https://github.com/TryGhost/express-hbs) Express Handlebars template engine with inheritance, partials, i18n and async helpers.
-- [Ghost](https://ghost.org/) Just a blogging platform.
-- [handlebars-action](https://github.com/marketplace/actions/handlebars-action) A GitHub action to transform files in your repository with Handlebars templating.
-- [handlebars_assets](https://github.com/leshill/handlebars_assets) A Rails Asset Pipeline gem from Les Hill (@leshill).
-- [handlebars-helpers](https://github.com/assemble/handlebars-helpers) is an extensive library with 100+ handlebars helpers.
-- [handlebars-layouts](https://github.com/shannonmoeller/handlebars-layouts) is a set of helpers which implement extensible and embeddable layout blocks as seen in other popular templating languages.
-- [handlebars-loader](https://github.com/pcardune/handlebars-loader) A handlebars template loader for webpack.
-- [handlebars-wax](https://github.com/shannonmoeller/handlebars-wax) The missing Handlebars API. Effortless registration of data, partials, helpers, and decorators using file-system globs, modules, and plain-old JavaScript objects.
-- [hbs](https://github.com/pillarjs/hbs) An Express.js view engine adapter for Handlebars.js, from Don Park.
-- [html-bundler-webpack-plugin](https://github.com/webdiscus/html-bundler-webpack-plugin) The webpack plugin to compile templates, [supports Handlebars](https://github.com/webdiscus/html-bundler-webpack-plugin#using-template-handlebars).
-- [incremental-bars](https://github.com/atomictag/incremental-bars) adds support for [incremental-dom](https://github.com/google/incremental-dom) as template target to Handlebars.
-- [jQuery plugin](https://71104.github.io/jquery-handlebars/) allows you to use Handlebars.js with [jQuery](http://jquery.com/).
-- [just-handlebars-helpers](https://github.com/leapfrogtechnology/just-handlebars-helpers) A fully tested lightweight package with common Handlebars helpers.
-- [koa-hbs](https://github.com/jwilm/koa-hbs) [koa](https://github.com/koajs/koa) generator based renderer for Handlebars.js.
-- [Marionette.Handlebars](https://github.com/hashchange/marionette.handlebars) adds support for Handlebars and Mustache templates to Marionette.
-- [openVALIDATION](https://github.com/openvalidation/openvalidation) a natural language compiler for validation rules. Generates program code in Java, JavaScript, C#, Python and Rust with handlebars.
-- [Plop](https://plopjs.com/) is a micro-generator framework that makes it easy to create files with a level of uniformity.
-- [promised-handlebars](https://github.com/nknapp/promised-handlebars) is a wrapper for Handlebars that allows helpers to return Promises.
-- [sammy.js](https://github.com/quirkey/sammy) by Aaron Quint, a.k.a. quirkey, supports Handlebars.js as one of its template plugins.
-- [Swag](https://github.com/elving/swag) by [@elving](https://github.com/elving) is a growing collection of helpers for handlebars.js. Give your handlebars.js templates some swag son!
-- [SproutCore](https://www.sproutcore.com) uses Handlebars.js as its main templating engine, extending it with automatic data binding support.
-- [vite-plugin-handlebars](https://github.com/alexlafroscia/vite-plugin-handlebars) A package for Vite 2. Allows for running your HTML files through the Handlebars compiler.
-- [YUI](https://yuilibrary.com/yui/docs/handlebars/) implements a port of handlebars.
-
-## External Resources
-
-- [Gist about Synchronous and asynchronous loading of external handlebars templates](https://gist.github.com/2287070)
-
-Have a project using Handlebars? Send us a [pull request][pull-request]!
-
-## License
-
-Handlebars.js is released under the MIT license.
-
-[pull-request]: https://github.com/handlebars-lang/handlebars.js/pull/new/master

SECURITY.md

@@ -1,15 +0,0 @@
-# Security Policy
-
-We recommend always using the latest versions of Handlebars and its official companion libraries to ensure your application remains as secure as possible.
-
-## Supported Versions
-
-| Version | Supported          |
-| ------- | ------------------ |
-| 5.0.x   | :white_check_mark: |
-| 4.7.x   | :white_check_mark: |
-| < 4.7   | :x:                |
-
-## Reporting a Vulnerability
-
-To report a vulnerability, please visit https://github.com/handlebars-lang/handlebars.js/security.

bin/.eslintrc.js

@@ -0,0 +1,6 @@
+module.exports = {
+  rules: {
+    'no-console': 0,
+    'no-var': 0
+  }
+};

bin/handlebars

@@ -0,0 +1,176 @@
+#!/usr/bin/env node
+
+var argv = parseArgs({
+  'f': {
+    'type': 'string',
+    'description': 'Output File',
+    'alias': 'output'
+  },
+  'map': {
+    'type': 'string',
+    'description': 'Source Map File'
+  },
+  'a': {
+    'type': 'boolean',
+    'description': 'Exports amd style (require.js)',
+    'alias': 'amd'
+  },
+  'c': {
+    'type': 'string',
+    'description': 'Exports CommonJS style, path to Handlebars module',
+    'alias': 'commonjs',
+    'default': null
+  },
+  'h': {
+    'type': 'string',
+    'description': 'Path to handlebar.js (only valid for amd-style)',
+    'alias': 'handlebarPath',
+    'default': ''
+  },
+  'k': {
+    'type': 'string',
+    'description': 'Known helpers',
+    'alias': 'known'
+  },
+  'o': {
+    'type': 'boolean',
+    'description': 'Known helpers only',
+    'alias': 'knownOnly'
+  },
+  'm': {
+    'type': 'boolean',
+    'description': 'Minimize output',
+    'alias': 'min'
+  },
+  'n': {
+    'type': 'string',
+    'description': 'Template namespace',
+    'alias': 'namespace',
+    'default': 'Handlebars.templates'
+  },
+  's': {
+    'type': 'boolean',
+    'description': 'Output template function only.',
+    'alias': 'simple'
+  },
+  'N': {
+    'type': 'string',
+    'description': 'Name of passed string templates. Optional if running in a simple mode. Required when operating on multiple templates.',
+    'alias': 'name'
+  },
+  'i': {
+    'type': 'string',
+    'description': 'Generates a template from the passed CLI argument.\n"-" is treated as a special value and causes stdin to be read for the template value.',
+    'alias': 'string'
+  },
+  'r': {
+    'type': 'string',
+    'description': 'Template root. Base value that will be stripped from template names.',
+    'alias': 'root'
+  },
+  'p': {
+    'type': 'boolean',
+    'description': 'Compiling a partial template',
+    'alias': 'partial'
+  },
+  'd': {
+    'type': 'boolean',
+    'description': 'Include data when compiling',
+    'alias': 'data'
+  },
+  'e': {
+    'type': 'string',
+    'description': 'Template extension.',
+    'alias': 'extension',
+    'default': 'handlebars'
+  },
+  'b': {
+    'type': 'boolean',
+    'description': 'Removes the BOM (Byte Order Mark) from the beginning of the templates.',
+    'alias': 'bom'
+  },
+  'v': {
+    'type': 'boolean',
+    'description': 'Prints the current compiler version',
+    'alias': 'version'
+  },
+  'help': {
+    'type': 'boolean',
+    'description': 'Outputs this message'
+  }
+});
+
+argv.files = argv._;
+delete argv._;
+
+var Precompiler = require('../dist/cjs/precompiler');
+Precompiler.loadTemplates(argv, function(err, opts) {
+
+  if (err) {
+    throw err;
+  }
+
+  if (opts.help || (!opts.templates.length && !opts.version)) {
+    printUsage(argv._spec, 120);
+  } else {
+    Precompiler.cli(opts);
+  }
+});
+
+function pad(n) {
+  var str = '';
+  while (str.length < n) {
+    str += ' ';
+  }
+  return str;
+}
+
+function parseArgs(spec) {
+  var opts = { alias: {}, boolean: [], default: {}, string: [] };
+
+  Object.keys(spec).forEach(function (arg) {
+    var opt = spec[arg];
+    opts[opt.type].push(arg);
+    if ('alias' in opt) opts.alias[arg] = opt.alias;
+    if ('default' in opt) opts.default[arg] = opt.default;
+  });
+
+  var argv = require('minimist')(process.argv.slice(2), opts);
+  argv._spec = spec;
+  return argv;
+}
+
+function printUsage(spec, wrap) {
+  var wordwrap = require('wordwrap');
+
+  console.log('Precompile handlebar templates.');
+  console.log('Usage: handlebars [template|directory]...');
+
+  var opts = [];
+  var width = 0;
+  Object.keys(spec).forEach(function (arg) {
+    var opt = spec[arg];
+
+    var name = (arg.length === 1 ? '-' : '--') + arg;
+    if ('alias' in opt) name += ', --' + opt.alias;
+
+    var meta = '[' + opt.type + ']';
+    if ('default' in opt) meta += ' [default: ' + JSON.stringify(opt.default) + ']';
+
+    opts.push({ name: name, desc: opt.description, meta: meta });
+    if (name.length > width) width = name.length;
+  });
+
+  console.log('Options:');
+  opts.forEach(function (opt) {
+    var desc = wordwrap(width + 4, wrap + 1)(opt.desc);
+
+    console.log('  %s%s%s%s%s',
+      opt.name,
+      pad(width - opt.name.length + 2),
+      desc.slice(width + 4),
+      pad(wrap - opt.meta.length - desc.split(/\n/).pop().length),
+      opt.meta
+      );
+  });
+}

bin/handlebars.mjs

@@ -1,136 +0,0 @@
-#!/usr/bin/env node
-
-import { createRequire } from 'node:module';
-import yargs from 'yargs';
-
-const require = createRequire(import.meta.url);
-const Precompiler = require('../dist/cjs/precompiler');
-
-const parser = yargs(process.argv.slice(2))
-  .usage('Precompile handlebar templates.\nUsage: $0 [template|directory]...')
-  .help(false)
-  .version(false)
-  .option('f', {
-    type: 'string',
-    description: 'Output File',
-    alias: 'output',
-  })
-  .option('map', {
-    type: 'string',
-    description: 'Source Map File',
-  })
-  .option('a', {
-    type: 'boolean',
-    description: 'Exports amd style (require.js)',
-    alias: 'amd',
-  })
-  .option('c', {
-    type: 'string',
-    description: 'Exports CommonJS style, path to Handlebars module',
-    alias: 'commonjs',
-    default: null,
-  })
-  .option('h', {
-    type: 'string',
-    description: 'Path to handlebar.js (only valid for amd-style)',
-    alias: 'handlebarPath',
-    default: '',
-  })
-  .option('k', {
-    type: 'string',
-    description: 'Known helpers',
-    alias: 'known',
-  })
-  .option('o', {
-    type: 'boolean',
-    description: 'Known helpers only',
-    alias: 'knownOnly',
-  })
-  .option('m', {
-    type: 'boolean',
-    description: 'Minimize output',
-    alias: 'min',
-  })
-  .option('n', {
-    type: 'string',
-    description: 'Template namespace',
-    alias: 'namespace',
-    default: 'Handlebars.templates',
-  })
-  .option('s', {
-    type: 'boolean',
-    description: 'Output template function only.',
-    alias: 'simple',
-  })
-  .option('N', {
-    type: 'string',
-    description:
-      'Name of passed string templates. Optional if running in a simple mode. Required when operating on multiple templates.',
-    alias: 'name',
-  })
-  .option('i', {
-    type: 'string',
-    description:
-      'Generates a template from the passed CLI argument.\n"-" is treated as a special value and causes stdin to be read for the template value.',
-    alias: 'string',
-  })
-  .option('r', {
-    type: 'string',
-    description:
-      'Template root. Base value that will be stripped from template names.',
-    alias: 'root',
-  })
-  .option('p', {
-    type: 'boolean',
-    description: 'Compiling a partial template',
-    alias: 'partial',
-  })
-  .option('d', {
-    type: 'boolean',
-    description: 'Include data when compiling',
-    alias: 'data',
-  })
-  .option('e', {
-    type: 'string',
-    description: 'Template extension.',
-    alias: 'extension',
-    default: 'handlebars',
-  })
-  .option('b', {
-    type: 'boolean',
-    description:
-      'Removes the BOM (Byte Order Mark) from the beginning of the templates.',
-    alias: 'bom',
-  })
-  .option('v', {
-    type: 'boolean',
-    description: 'Prints the current compiler version',
-    alias: 'version',
-  })
-  .option('help', {
-    type: 'boolean',
-    description: 'Outputs this message',
-  })
-  .wrap(120);
-
-const argv = parser.parseSync();
-argv.files = argv._;
-delete argv._;
-
-Precompiler.loadTemplates(argv, function (err, opts) {
-  if (err) {
-    throw err;
-  }
-
-  if (opts.help || (!opts.templates.length && !opts.version)) {
-    parser.showHelp('log');
-  } else {
-    // cli() is async (returns a Promise), so errors would become unhandled
-    // rejections. Re-throw via nextTick to surface them as uncaught exceptions.
-    Promise.resolve(Precompiler.cli(opts)).catch((error) => {
-      process.nextTick(() => {
-        throw error;
-      });
-    });
-  }
-});

components/bower.json

@@ -1,6 +1,6 @@
 {
   "name": "handlebars",
-  "version": "5.0.0-alpha.1",
+  "version": "4.7.9",
   "main": "handlebars.js",
   "license": "MIT",
   "dependencies": {}

components/component.json

@@ -3,5 +3,7 @@
   "repo": "components/handlebars.js",
   "version": "1.0.0",
   "main": "handlebars.js",
-  "scripts": ["handlebars.js"]
+  "scripts": [
+    "handlebars.js"
+  ]
 }

components/composer.json

@@ -1,35 +1,31 @@
 {
-  "name": "components/handlebars.js",
+    "name": "components/handlebars.js",
-  "description": "Handlebars.js and Mustache are both logicless templating languages that keep the view and the code separated like we all know they should be.",
+    "description": "Handlebars.js and Mustache are both logicless templating languages that keep the view and the code separated like we all know they should be.",
-  "homepage": "http://handlebarsjs.com",
+    "homepage": "https://handlebarsjs.com",
-  "license": "MIT",
+    "license": "MIT",
-  "type": "component",
+    "type": "component",
-  "keywords": [
+    "keywords": [
-    "handlebars",
+        "handlebars",
-    "mustache",
+        "mustache",
-    "html"
+        "html"
-  ],
+    ],
-  "authors": [
+    "authors": [
-    {
+        {
-      "name": "Chris Wanstrath",
+            "name": "Chris Wanstrath"
-      "homepage": "http://chriswanstrath.com"
+        }
+    ],
+    "extra": {
+        "component": {
+            "name": "handlebars",
+            "scripts": [
+                "handlebars.js"
+            ],
+            "files": [
+                "handlebars.runtime.js"
+            ],
+            "shim": {
+                "exports": "Handlebars"
+            }
+        }
     }
-  ],
-  "require": {
-    "robloach/component-installer": "*"
-  },
-  "extra": {
-    "component": {
-      "name": "handlebars",
-      "scripts": [
-        "handlebars.js"
-      ],
-      "files": [
-        "handlebars.runtime.js"
-      ],
-      "shim": {
-        "exports": "Handlebars"
-      }
-    }
-  }
 }

components/handlebars.js.nuspec

@@ -2,7 +2,7 @@
 <package>
 	<metadata>
 		<id>handlebars.js</id>
-		<version>5.0.0-alpha.1</version>
+		<version>4.7.9</version>
 		<authors>handlebars.js Authors</authors>
 		<licenseUrl>https://github.com/handlebars-lang/handlebars.js/blob/master/LICENSE</licenseUrl>
 		<projectUrl>https://github.com/handlebars-lang/handlebars.js/</projectUrl>

components/package.json

@@ -1,6 +1,6 @@
 {
   "name": "handlebars",
-  "version": "5.0.0-alpha.1",
+  "version": "4.7.9",
   "license": "MIT",
   "jspm": {
     "main": "handlebars",

docs/compiler-api.md

@@ -34,8 +34,8 @@ let ast = Handlebars.parseWithoutProcessing(myTemplate);
 
 `Handlebars.parse` will parse the template with `parseWithoutProcessing` (see above) then it will update the AST to strip extraneous whitespace. The whitespace stripping functionality handles two distinct situations:
 
-- Removes whitespace around dynamic statements that are on a line by themselves (aka "stand alone")
+* Removes whitespace around dynamic statements that are on a line by themselves (aka "stand alone")
-- Applies "whitespace control" characters (i.e. `~`) by truncating the `ContentStatement` `value` property appropriately (e.g. `\n\n{{~foo}}` would have a `ContentStatement` with a `value` of `''`)
+* Applies "whitespace control" characters (i.e. `~`) by truncating the `ContentStatement` `value` property appropriately (e.g. `\n\n{{~foo}}` would have a `ContentStatement` with a `value` of `''`)
 
 `Handlebars.parse` is used internally by `Handlebars.precompile` and `Handlebars.compile`.
 
@@ -71,7 +71,7 @@ interface Position {
 interface Program <: Node {
     type: "Program";
     body: [ Statement ];
-
+    
     blockParams: [ string ];
 }
 ```
@@ -132,6 +132,7 @@ interface PartialBlockStatement <: Statement {
 
 `name` will be a `SubExpression` when tied to a dynamic partial, i.e. `{{> (foo) }}`, otherwise this is a path or literal whose `original` value is used to lookup the desired partial.
 
+
 ```java
 interface ContentStatement <: Statement {
     type: "ContentStatement";
@@ -147,6 +148,7 @@ interface CommentStatement <: Statement {
 }
 ```
 
+
 ```java
 interface Decorator <: Statement {
     type: "Decorator";
@@ -207,6 +209,7 @@ interface PathExpression <: Expression {
 - `parts` is an array of the names in the path. `foo.bar` would be `['foo', 'bar']`. Scope references, `.`, `..`, and `this` should be omitted from this array.
 - `original` is the path as entered by the user. Separator and scope references are left untouched.
 
+
 ##### Literals
 
 ```java
@@ -239,6 +242,7 @@ interface NullLiteral <: Literal {
 }
 ```
 
+
 ### Miscellaneous
 
 ```java
@@ -275,8 +279,8 @@ function ImportScanner() {
 }
 ImportScanner.prototype = new Visitor();
 
-ImportScanner.prototype.PartialStatement = function (partial) {
+ImportScanner.prototype.PartialStatement = function(partial) {
-  this.partials.push({ request: partial.name.original });
+  this.partials.push({request: partial.name.original});
 
   Visitor.prototype.PartialStatement.call(this, partial);
 };
@@ -287,7 +291,7 @@ scanner.accept(ast);
 
 The current node's ancestors will be maintained in the `parents` array, with the most recent parent listed first.
 
-The visitor may also be configured to operate in mutation mode by setting the `mutating` field to true. When in this mode, handler methods may return any valid AST node and it will replace the one they are currently operating on. Returning `false` will remove the given value (if valid) and returning `undefined` will leave the node intact. This return structure only apply to mutation mode and non-mutation mode visitors are free to return whatever values they wish.
+The visitor may also be configured to operate in mutation mode by setting the `mutation` field to true. When in this mode, handler methods may return any valid AST node and it will replace the one they are currently operating on. Returning `false` will remove the given value (if valid) and returning `undefined` will leave the node in tact. This return structure only apply to mutation mode and non-mutation mode visitors are free to return whatever values they wish.
 
 Implementors that may need to support mutation mode are encouraged to utilize the `acceptKey`, `acceptRequired` and `acceptArray` helpers which provide the conditional overwrite behavior as well as implement sanity checks where pertinent.
 
@@ -296,7 +300,8 @@ Implementors that may need to support mutation mode are encouraged to utilize th
 The `Handlebars.JavaScriptCompiler` object has a number of methods that may be customized to alter the output of the compiler:
 
 - `nameLookup(parent, name, type)`
-  Used to generate the code to resolve a given path component.
+  Used to generate the code to resolve a give path component.
+
   - `parent` is the existing code in the path resolution
   - `name` is the current path component
   - `type` is the type of name being evaluated. May be one of `context`, `data`, `helper`, `decorator`, or `partial`.
@@ -304,19 +309,20 @@ The `Handlebars.JavaScriptCompiler` object has a number of methods that may be c
   Note that this does not impact dynamic partials, which implementors need to be aware of. Overriding `VM.resolvePartial` may be required to support dynamic cases.
 
 - `depthedLookup(name)`
-  Used to generate code that resolves parameters within any context in the stack. Is only used in `compat` mode.
+  Used to generate code that resolves parameters within any context in the stack. Is only used in `compat` mode. 
 
 - `compilerInfo()`
   Allows for custom compiler flags used in the runtime version checking logic.
 
 - `appendToBuffer(source, location, explicit)`
-  Allows for code buffer emitting code. Defaults behavior is string concatenation.
+    Allows for code buffer emitting code. Defaults behavior is string concatenation.
-  - `source` is the source code whose result is to be appending
+
-  - `location` is the location of the source in the source map.
+    - `source` is the source code whose result is to be appending
-  - `explicit` is a flag signaling that the emit operation must occur, vs. the lazy evaled options otherwise.
+    - `location` is the location of the source in the source map.
+    - `explicit` is a flag signaling that the emit operation must occur, vs. the lazy evaled options otherwise.
 
 - `initializeBuffer()`
-  Allows for buffers other than the default string buffer to be used. Generally needs to be paired with a custom `appendToBuffer` implementation.
+    Allows for buffers other than the default string buffer to be used. Generally needs to be paired with a custom `appendToBuffer` implementation.
 
 ### Example for the compiler api.
 
@@ -324,6 +330,7 @@ This example changes all lookups of properties are performed by a helper (`looku
 
 There is also [a jsfiddle with this code](https://jsfiddle.net/9D88g/162/) if you want to play around with it.
 
+
 ```javascript
 function MyCompiler() {
   Handlebars.JavaScriptCompiler.apply(this, arguments);
@@ -331,35 +338,29 @@ function MyCompiler() {
 MyCompiler.prototype = new Handlebars.JavaScriptCompiler();
 
 // Use this compile to compile BlockStatment-Blocks
-MyCompiler.prototype.compiler = MyCompiler;
+MyCompiler.prototype.compiler = MyCompiler
 
-MyCompiler.prototype.nameLookup = function (parent, name, type) {
+MyCompiler.prototype.nameLookup = function(parent, name, type) {
   if (type === 'context') {
-    return this.source.functionCall('helpers.lookupLowerCase', '', [
+    return this.source.functionCall('helpers.lookupLowerCase', '', [parent, JSON.stringify(name)])
-      parent,
-      JSON.stringify(name),
-    ]);
   } else {
-    return Handlebars.JavaScriptCompiler.prototype.nameLookup.call(
+    return Handlebars.JavaScriptCompiler.prototype.nameLookup.call(this, parent, name, type);
-      this,
-      parent,
-      name,
-      type
-    );
   }
-};
+}
 
 var env = Handlebars.create();
-env.registerHelper('lookupLowerCase', function (parent, name) {
+env.registerHelper('lookupLowerCase', function(parent, name) {
-  return parent[name.toLowerCase()];
+  return parent[name.toLowerCase()]
-});
+})
 
 env.JavaScriptCompiler = MyCompiler;
 
 var template = env.compile('{{#each Test}} ({{Value}}) {{/each}}');
-console.log(
+console.log(template({
-  template({
+  test: [ 
-    test: [{ value: 'a' }, { value: 'b' }, { value: 'c' }],
+    {value: 'a'},
-  })
+    {value: 'b'},
-);
+    {value: 'c'}
+    ]
+}));
 ```

docs/decorators-api.md

@@ -1,8 +1,6 @@
 # Decorators
 
-**Decorators are deprecated, please join the discussion at [#1574](https://github.com/handlebars-lang/handlebars.js/issues/1574) to see what we can do about it.**
+Decorators allow for blocks to be annotated with metadata or wrapped in functionality prior to execution of the block. This may be used to communicate with the containing helper or to setup a particular state in the system prior to running the block.
-
-Decorators allow for blocks to be annotated with metadata or wrapped in functionality prior to execution of the block. This may be used to communicate with the containing helper or to set up a particular state in the system prior to running the block.
 
 Decorators are registered through similar methods as helpers, `registerDecorators` and `unregisterDecorators`. These can then be referenced via the friendly name in the template using the `{{* decorator}}` and `{{#* decorator}}{/decorator}}` syntaxes. These syntaxes are derivatives of the normal mustache syntax and as such have all of the same argument and whitespace behaviors.
 

eslint.config.mjs

@@ -1,17 +0,0 @@
-import compat from 'eslint-plugin-compat';
-
-export default [
-  {
-    // Ignore everything except lib/
-    ignores: ['**', '!lib/**'],
-  },
-  {
-    // Only check browser API compat in the runtime library code.
-    // All other linting is handled by oxlint.
-    ...compat.configs['flat/recommended'],
-    files: ['lib/**/*.js'],
-    linterOptions: {
-      reportUnusedDisableDirectives: 'off',
-    },
-  },
-];

lib/.eslintrc.js

@@ -0,0 +1,8 @@
+module.exports = {
+  env: {
+    // Handlebars should not use node or browser-specific APIs
+    'shared-node-browser': true,
+    node: false,
+    browser: false
+  }
+};

lib/handlebars.js

@@ -1,16 +1,15 @@
-import {
-  parser as Parser,
-  parse,
-  parseWithoutProcessing,
-  Visitor,
-} from '@handlebars/parser';
-
 import runtime from './handlebars.runtime';
 
 // Compiler imports
 import AST from './handlebars/compiler/ast';
+import {
+  parser as Parser,
+  parse,
+  parseWithoutProcessing
+} from './handlebars/compiler/base';
 import { Compiler, compile, precompile } from './handlebars/compiler/compiler';
 import JavaScriptCompiler from './handlebars/compiler/javascript-compiler';
+import Visitor from './handlebars/compiler/visitor';
 
 import noConflict from './handlebars/no-conflict';
 
@@ -18,10 +17,10 @@ let _create = runtime.create;
 function create() {
   let hb = _create();
 
-  hb.compile = function (input, options) {
+  hb.compile = function(input, options) {
     return compile(input, options, hb);
   };
-  hb.precompile = function (input, options) {
+  hb.precompile = function(input, options) {
     return precompile(input, options, hb);
   };
 

lib/handlebars.runtime.js

@@ -1,9 +1,9 @@
-import { Exception } from '@handlebars/parser';
 import * as base from './handlebars/base';
 
 // Each of these augment the Handlebars object. No need to setup here.
 // (This is done to easily share code between commonjs and browse envs)
 import SafeString from './handlebars/safe-string';
+import Exception from './handlebars/exception';
 import * as Utils from './handlebars/utils';
 import * as runtime from './handlebars/runtime';
 
@@ -19,11 +19,8 @@ function create() {
   hb.Utils = Utils;
   hb.escapeExpression = Utils.escapeExpression;
 
-  // Spread into a plain object so that runtime functions (e.g. checkRevision)
+  hb.VM = runtime;
-  // can be overridden by consumers. ES module namespace objects are sealed with
+  hb.template = function(spec) {
-  // getter-only properties per spec, which would prevent monkey-patching.
-  hb.VM = { ...runtime };
-  hb.template = function (spec) {
     return runtime.template(spec, hb);
   };
 

lib/handlebars/base.js

@@ -1,11 +1,11 @@
-import { Exception } from '@handlebars/parser';
 import { createFrame, extend, toString } from './utils';
+import Exception from './exception';
 import { registerDefaultHelpers } from './helpers';
 import { registerDefaultDecorators } from './decorators';
 import logger from './logger';
 import { resetLoggedProperties } from './internal/proto-access';
 
-export const VERSION = '4.7.7';
+export const VERSION = '4.7.9';
 export const COMPILER_REVISION = 8;
 export const LAST_COMPATIBLE_COMPILER_REVISION = 7;
 
@@ -17,7 +17,7 @@ export const REVISION_CHANGES = {
   5: '== 2.0.0-alpha.x',
   6: '>= 2.0.0-beta.1',
   7: '>= 4.0.0 <4.3.0',
-  8: '>= 4.3.0',
+  8: '>= 4.3.0'
 };
 
 const objectType = '[object Object]';
@@ -37,7 +37,7 @@ HandlebarsEnvironment.prototype = {
   logger: logger,
   log: logger.log,
 
-  registerHelper: function (name, fn) {
+  registerHelper: function(name, fn) {
     if (toString.call(name) === objectType) {
       if (fn) {
         throw new Exception('Arg not supported with multiple helpers');
@@ -47,11 +47,11 @@ HandlebarsEnvironment.prototype = {
       this.helpers[name] = fn;
     }
   },
-  unregisterHelper: function (name) {
+  unregisterHelper: function(name) {
     delete this.helpers[name];
   },
 
-  registerPartial: function (name, partial) {
+  registerPartial: function(name, partial) {
     if (toString.call(name) === objectType) {
       extend(this.partials, name);
     } else {
@@ -63,11 +63,11 @@ HandlebarsEnvironment.prototype = {
       this.partials[name] = partial;
     }
   },
-  unregisterPartial: function (name) {
+  unregisterPartial: function(name) {
     delete this.partials[name];
   },
 
-  registerDecorator: function (name, fn) {
+  registerDecorator: function(name, fn) {
     if (toString.call(name) === objectType) {
       if (fn) {
         throw new Exception('Arg not supported with multiple decorators');
@@ -77,7 +77,7 @@ HandlebarsEnvironment.prototype = {
       this.decorators[name] = fn;
     }
   },
-  unregisterDecorator: function (name) {
+  unregisterDecorator: function(name) {
     delete this.decorators[name];
   },
   /**
@@ -86,7 +86,7 @@ HandlebarsEnvironment.prototype = {
    */
   resetLoggedPropertyAccesses() {
     resetLoggedProperties();
-  },
+  }
 };
 
 export let log = logger.log;

lib/handlebars/compiler/ast.js

@@ -4,7 +4,7 @@ let AST = {
     // a mustache is definitely a helper if:
     // * it is an eligible helper, and
     // * it has at least one parameter or hash segment
-    helperExpression: function (node) {
+    helperExpression: function(node) {
       return (
         node.type === 'SubExpression' ||
         ((node.type === 'MustacheStatement' ||
@@ -13,18 +13,18 @@ let AST = {
       );
     },
 
-    scopedId: function (path) {
+    scopedId: function(path) {
       return /^\.|this\b/.test(path.original);
     },
 
     // an ID is simple if it only has one part, and that part is not
     // `..` or `this`.
-    simpleId: function (path) {
+    simpleId: function(path) {
       return (
         path.parts.length === 1 && !AST.helpers.scopedId(path) && !path.depth
       );
-    },
+    }
-  },
+  }
 };
 
 // Must be exported as an object rather than the root of the module as the jison lexer

lib/handlebars/compiler/base.js

@@ -0,0 +1,34 @@
+import parser from './parser';
+import WhitespaceControl from './whitespace-control';
+import * as Helpers from './helpers';
+import { extend } from '../utils';
+
+export { parser };
+
+let yy = {};
+extend(yy, Helpers);
+
+export function parseWithoutProcessing(input, options) {
+  // Just return if an already-compiled AST was passed in.
+  if (input.type === 'Program') {
+    return input;
+  }
+
+  parser.yy = yy;
+
+  // Altering the shared object here, but this is ok as parser is a sync operation
+  yy.locInfo = function(locInfo) {
+    return new yy.SourceLocation(options && options.srcName, locInfo);
+  };
+
+  let ast = parser.parse(input);
+
+  return ast;
+}
+
+export function parse(input, options) {
+  let ast = parseWithoutProcessing(input, options);
+  let strip = new WhitespaceControl(options);
+
+  return strip.accept(ast);
+}

lib/handlebars/compiler/code-gen.js

@@ -1,54 +1,48 @@
-/* global define */
+/* global define, require */
 import { isArray } from '../utils';
 
 let SourceNode;
 
 try {
-  /* v8 ignore next */
+  /* istanbul ignore next */
   if (typeof define !== 'function' || !define.amd) {
     // We don't support this in AMD environments. For these environments, we assume that
     // they are running on the browser and thus have no need for the source-map library.
-    // The variable indirection prevents bundlers from statically resolving and bundling
+    let SourceMap = require('source-map');
-    // source-map (which requires Node-built-ins). The stub SourceNode below handles
-    // browser/bundled usage. Bundlers may emit a "Critical dependency" warning — this
-    // is expected and harmless.
-    let mod = 'source-map';
-    let SourceMap = require(mod);
     SourceNode = SourceMap.SourceNode;
   }
-  // oxlint-disable-next-line no-unused-vars -- Babel 5 requires named catch param
 } catch (err) {
   /* NOP */
 }
 
-/* v8 ignore next -- tested but not covered due to dist build */
+/* istanbul ignore if: tested but not covered in istanbul due to dist build  */
 if (!SourceNode) {
-  SourceNode = function (line, column, srcFile, chunks) {
+  SourceNode = function(line, column, srcFile, chunks) {
     this.src = '';
     if (chunks) {
       this.add(chunks);
     }
   };
-  /* v8 ignore next */
+  /* istanbul ignore next */
   SourceNode.prototype = {
-    add: function (chunks) {
+    add: function(chunks) {
       if (isArray(chunks)) {
         chunks = chunks.join('');
       }
       this.src += chunks;
     },
-    prepend: function (chunks) {
+    prepend: function(chunks) {
       if (isArray(chunks)) {
         chunks = chunks.join('');
       }
       this.src = chunks + this.src;
     },
-    toStringWithSourceMap: function () {
+    toStringWithSourceMap: function() {
       return { code: this.toString() };
     },
-    toString: function () {
+    toString: function() {
       return this.src;
-    },
+    }
   };
 }
 
@@ -76,32 +70,32 @@ CodeGen.prototype = {
   isEmpty() {
     return !this.source.length;
   },
-  prepend: function (source, loc) {
+  prepend: function(source, loc) {
     this.source.unshift(this.wrap(source, loc));
   },
-  push: function (source, loc) {
+  push: function(source, loc) {
     this.source.push(this.wrap(source, loc));
   },
 
-  merge: function () {
+  merge: function() {
     let source = this.empty();
-    this.each(function (line) {
+    this.each(function(line) {
       source.add(['  ', line, '\n']);
     });
     return source;
   },
 
-  each: function (iter) {
+  each: function(iter) {
     for (let i = 0, len = this.source.length; i < len; i++) {
       iter(this.source[i]);
     }
   },
 
-  empty: function () {
+  empty: function() {
     let loc = this.currentLocation || { start: {} };
     return new SourceNode(loc.start.line, loc.start.column, this.srcFile);
   },
-  wrap: function (chunk, loc = this.currentLocation || { start: {} }) {
+  wrap: function(chunk, loc = this.currentLocation || { start: {} }) {
     if (chunk instanceof SourceNode) {
       return chunk;
     }
@@ -116,12 +110,12 @@ CodeGen.prototype = {
     );
   },
 
-  functionCall: function (fn, type, params) {
+  functionCall: function(fn, type, params) {
     params = this.generateList(params);
     return this.wrap([fn, type ? '.' + type + '(' : '(', params, ')']);
   },
 
-  quotedString: function (str) {
+  quotedString: function(str) {
     return (
       '"' +
       (str + '')
@@ -135,10 +129,10 @@ CodeGen.prototype = {
     );
   },
 
-  objectLiteral: function (obj) {
+  objectLiteral: function(obj) {
     let pairs = [];
 
-    Object.keys(obj).forEach((key) => {
+    Object.keys(obj).forEach(key => {
       let value = castChunk(obj[key], this);
       if (value !== 'undefined') {
         pairs.push([this.quotedString(key), ':', value]);
@@ -151,7 +145,7 @@ CodeGen.prototype = {
     return ret;
   },
 
-  generateList: function (entries) {
+  generateList: function(entries) {
     let ret = this.empty();
 
     for (let i = 0, len = entries.length; i < len; i++) {
@@ -165,13 +159,13 @@ CodeGen.prototype = {
     return ret;
   },
 
-  generateArray: function (entries) {
+  generateArray: function(entries) {
     let ret = this.generateList(entries);
     ret.prepend('[');
     ret.add(']');
 
     return ret;
-  },
+  }
 };
 
 export default CodeGen;

lib/handlebars/compiler/compiler.js

@@ -1,5 +1,13 @@
-import { Exception } from '@handlebars/parser';
+/* eslint-disable new-cap */
-import { isArray, indexOf, extend } from '../utils';
+
+import Exception from '../exception';
+import {
+  isArray,
+  indexOf,
+  extend,
+  sanitizeDepth,
+  sanitizeParts
+} from '../utils';
 import AST from './ast';
 
 const slice = [].slice;
@@ -14,7 +22,7 @@ export function Compiler() {}
 Compiler.prototype = {
   compiler: Compiler,
 
-  equals: function (other) {
+  equals: function(other) {
     let len = this.opcodes.length;
     if (other.opcodes.length !== len) {
       return false;
@@ -45,11 +53,13 @@ Compiler.prototype = {
 
   guid: 0,
 
-  compile: function (program, options) {
+  compile: function(program, options) {
     this.sourceNode = [];
     this.opcodes = [];
     this.children = [];
     this.options = options;
+    this.stringParams = options.stringParams;
+    this.trackIds = options.trackIds;
 
     options.blockParams = options.blockParams || [];
 
@@ -63,7 +73,7 @@ Compiler.prototype = {
         unless: true,
         with: true,
         log: true,
-        lookup: true,
+        lookup: true
       },
       options.knownHelpers
     );
@@ -71,8 +81,8 @@ Compiler.prototype = {
     return this.accept(program);
   },
 
-  compileProgram: function (program) {
+  compileProgram: function(program) {
-    let childCompiler = new this.compiler(),
+    let childCompiler = new this.compiler(), // eslint-disable-line new-cap
       result = childCompiler.compile(program, this.options),
       guid = this.guid++;
 
@@ -84,8 +94,8 @@ Compiler.prototype = {
     return guid;
   },
 
-  accept: function (node) {
+  accept: function(node) {
-    /* v8 ignore next -- Sanity code */
+    /* istanbul ignore next: Sanity code */
     if (!this[node.type]) {
       throw new Exception('Unknown type: ' + node.type, node);
     }
@@ -96,7 +106,7 @@ Compiler.prototype = {
     return ret;
   },
 
-  Program: function (program) {
+  Program: function(program) {
     this.options.blockParams.unshift(program.blockParams);
 
     let body = program.body,
@@ -113,7 +123,7 @@ Compiler.prototype = {
     return this;
   },
 
-  BlockStatement: function (block) {
+  BlockStatement: function(block) {
     transformLiteralToPath(block);
 
     let program = block.program,
@@ -158,7 +168,7 @@ Compiler.prototype = {
     this.opcode('registerDecorator', params.length, path.original);
   },
 
-  PartialStatement: function (partial) {
+  PartialStatement: function(partial) {
     this.usePartial = true;
 
     let program = partial.program;
@@ -197,11 +207,11 @@ Compiler.prototype = {
     this.opcode('invokePartial', isDynamic, partialName, indent);
     this.opcode('append');
   },
-  PartialBlockStatement: function (partialBlock) {
+  PartialBlockStatement: function(partialBlock) {
     this.PartialStatement(partialBlock);
   },
 
-  MustacheStatement: function (mustache) {
+  MustacheStatement: function(mustache) {
     this.SubExpression(mustache);
 
     if (mustache.escaped && !this.options.noEscape) {
@@ -214,15 +224,15 @@ Compiler.prototype = {
     this.DecoratorBlock(decorator);
   },
 
-  ContentStatement: function (content) {
+  ContentStatement: function(content) {
     if (content.value) {
       this.opcode('appendContent', content.value);
     }
   },
 
-  CommentStatement: function () {},
+  CommentStatement: function() {},
 
-  SubExpression: function (sexpr) {
+  SubExpression: function(sexpr) {
     transformLiteralToPath(sexpr);
     let type = this.classifySexpr(sexpr);
 
@@ -234,12 +244,12 @@ Compiler.prototype = {
       this.ambiguousSexpr(sexpr);
     }
   },
-  ambiguousSexpr: function (sexpr, program, inverse) {
+  ambiguousSexpr: function(sexpr, program, inverse) {
     let path = sexpr.path,
       name = path.parts[0],
       isBlock = program != null || inverse != null;
 
-    this.opcode('getContext', path.depth);
+    this.opcode('getContext', sanitizeDepth(path.depth));
 
     this.opcode('pushProgram', program);
     this.opcode('pushProgram', inverse);
@@ -250,14 +260,14 @@ Compiler.prototype = {
     this.opcode('invokeAmbiguous', name, isBlock);
   },
 
-  simpleSexpr: function (sexpr) {
+  simpleSexpr: function(sexpr) {
     let path = sexpr.path;
     path.strict = true;
     this.accept(path);
     this.opcode('resolvePossibleLambda');
   },
 
-  helperSexpr: function (sexpr, program, inverse) {
+  helperSexpr: function(sexpr, program, inverse) {
     let params = this.setupFullMustacheParams(sexpr, program, inverse),
       path = sexpr.path,
       name = path.parts[0];
@@ -283,54 +293,57 @@ Compiler.prototype = {
     }
   },
 
-  PathExpression: function (path) {
+  PathExpression: function(path) {
-    this.addDepth(path.depth);
+    // Sanitize untrusted AST values at the compiler boundary.
-    this.opcode('getContext', path.depth);
+    // javascript-compiler.js trusts all opcode arguments to be safe.
+    const depth = sanitizeDepth(path.depth);
+    const parts = sanitizeParts(path.parts);
 
-    let name = path.parts[0],
+    this.addDepth(depth);
+    this.opcode('getContext', depth);
+
+    let name = parts[0],
       scoped = AST.helpers.scopedId(path),
-      blockParamId = !path.depth && !scoped && this.blockParamIndex(name);
+      blockParamId = !depth && !scoped && this.blockParamIndex(name);
 
     if (blockParamId) {
-      this.opcode('lookupBlockParam', blockParamId, path.parts);
+      this.opcode(
+        'lookupBlockParam',
+        [Number(blockParamId[0]), Number(blockParamId[1])],
+        parts
+      );
     } else if (!name) {
       // Context reference, i.e. `{{foo .}}` or `{{foo ..}}`
       this.opcode('pushContext');
     } else if (path.data) {
       this.options.data = true;
-      this.opcode('lookupData', path.depth, path.parts, path.strict);
+      this.opcode('lookupData', depth, parts, path.strict);
     } else {
-      this.opcode(
+      this.opcode('lookupOnContext', parts, path.falsy, path.strict, scoped);
-        'lookupOnContext',
-        path.parts,
-        path.falsy,
-        path.strict,
-        scoped
-      );
     }
   },
 
-  StringLiteral: function (string) {
+  StringLiteral: function(string) {
     this.opcode('pushString', string.value);
   },
 
-  NumberLiteral: function (number) {
+  NumberLiteral: function(number) {
-    this.opcode('pushLiteral', number.value);
+    this.opcode('pushLiteral', Number(number.value));
   },
 
-  BooleanLiteral: function (bool) {
+  BooleanLiteral: function(bool) {
-    this.opcode('pushLiteral', bool.value);
+    this.opcode('pushLiteral', bool.value === true ? 'true' : 'false');
   },
 
-  UndefinedLiteral: function () {
+  UndefinedLiteral: function() {
     this.opcode('pushLiteral', 'undefined');
   },
 
-  NullLiteral: function () {
+  NullLiteral: function() {
     this.opcode('pushLiteral', 'null');
   },
 
-  Hash: function (hash) {
+  Hash: function(hash) {
     let pairs = hash.pairs,
       i = 0,
       l = pairs.length;
@@ -347,15 +360,15 @@ Compiler.prototype = {
   },
 
   // HELPERS
-  opcode: function (name) {
+  opcode: function(name) {
     this.opcodes.push({
       opcode: name,
       args: slice.call(arguments, 1),
-      loc: this.sourceNode[0].loc,
+      loc: this.sourceNode[0].loc
     });
   },
 
-  addDepth: function (depth) {
+  addDepth: function(depth) {
     if (!depth) {
       return;
     }
@@ -363,7 +376,7 @@ Compiler.prototype = {
     this.useDepths = true;
   },
 
-  classifySexpr: function (sexpr) {
+  classifySexpr: function(sexpr) {
     let isSimple = AST.helpers.simpleId(sexpr.path);
 
     let isBlockParam = isSimple && !!this.blockParamIndex(sexpr.path.parts[0]);
@@ -398,17 +411,57 @@ Compiler.prototype = {
     }
   },
 
-  pushParams: function (params) {
+  pushParams: function(params) {
     for (let i = 0, l = params.length; i < l; i++) {
       this.pushParam(params[i]);
     }
   },
 
-  pushParam: function (val) {
+  pushParam: function(val) {
-    this.accept(val);
+    let value = val.value != null ? val.value : val.original || '';
+    let depth = sanitizeDepth(val.depth);
+
+    if (this.stringParams) {
+      if (value.replace) {
+        value = value.replace(/^(\.?\.\/)*/g, '').replace(/\//g, '.');
+      }
+      if (depth) {
+        this.addDepth(depth);
+      }
+      this.opcode('getContext', depth);
+      this.opcode('pushStringParam', value, val.type);
+
+      if (val.type === 'SubExpression') {
+        // SubExpressions get evaluated and passed in
+        // in string params mode.
+        this.accept(val);
+      }
+    } else {
+      if (this.trackIds) {
+        let blockParamIndex;
+        if (val.parts && !AST.helpers.scopedId(val) && !val.depth) {
+          blockParamIndex = this.blockParamIndex(val.parts[0]);
+        }
+        if (blockParamIndex) {
+          let blockParamChild = val.parts.slice(1).join('.');
+          this.opcode('pushId', 'BlockParam', blockParamIndex, blockParamChild);
+        } else {
+          value = val.original || value;
+          if (value.replace) {
+            value = value
+              .replace(/^this(?:\.|$)/, '')
+              .replace(/^\.\//, '')
+              .replace(/^\.$/, '');
+          }
+
+          this.opcode('pushId', val.type, value);
+        }
+      }
+      this.accept(val);
+    }
   },
 
-  setupFullMustacheParams: function (sexpr, program, inverse, omitEmpty) {
+  setupFullMustacheParams: function(sexpr, program, inverse, omitEmpty) {
     let params = sexpr.params;
     this.pushParams(params);
 
@@ -424,7 +477,7 @@ Compiler.prototype = {
     return params;
   },
 
-  blockParamIndex: function (name) {
+  blockParamIndex: function(name) {
     for (
       let depth = 0, len = this.options.blockParams.length;
       depth < len;
@@ -436,44 +489,34 @@ Compiler.prototype = {
         return [depth, param];
       }
     }
-  },
+  }
 };
 
-export function precompile(input, options = {}, env) {
+export function precompile(input, options, env) {
-  validateInput(input, options);
+  if (
+    input == null ||
+    (typeof input !== 'string' && input.type !== 'Program')
+  ) {
+    throw new Exception(
+      'You must pass a string or Handlebars AST to Handlebars.precompile. You passed ' +
+        input
+    );
+  }
 
-  let environment = compileEnvironment(input, options, env);
+  options = options || {};
+  if (!('data' in options)) {
+    options.data = true;
+  }
+  if (options.compat) {
+    options.useDepths = true;
+  }
+
+  let ast = env.parse(input, options),
+    environment = new env.Compiler().compile(ast, options);
   return new env.JavaScriptCompiler().compile(environment, options);
 }
 
 export function compile(input, options = {}, env) {
-  options = extend({}, options);
-
-  validateInput(input, options);
-
-  let compiled;
-
-  function compileInput() {
-    let environment = compileEnvironment(input, options, env),
-      templateSpec = new env.JavaScriptCompiler().compile(
-        environment,
-        options,
-        undefined,
-        true
-      );
-    return env.template(templateSpec);
-  }
-
-  // Template is only compiled on first use and cached after that point.
-  return function (context, execOptions) {
-    if (!compiled) {
-      compiled = compileInput();
-    }
-    return compiled.call(this, context, execOptions);
-  };
-}
-
-function validateInput(input, options) {
   if (
     input == null ||
     (typeof input !== 'string' && input.type !== 'Program')
@@ -484,22 +527,48 @@ function validateInput(input, options) {
     );
   }
 
-  if (options.trackIds || options.stringParams) {
+  options = extend({}, options);
-    throw new Exception(
-      'TrackIds and stringParams are no longer supported. See Github #1145'
-    );
-  }
-
   if (!('data' in options)) {
     options.data = true;
   }
   if (options.compat) {
     options.useDepths = true;
   }
-}
+
-function compileEnvironment(input, options, env) {
+  let compiled;
-  let ast = env.parse(input, options);
+
-  return new env.Compiler().compile(ast, options);
+  function compileInput() {
+    let ast = env.parse(input, options),
+      environment = new env.Compiler().compile(ast, options),
+      templateSpec = new env.JavaScriptCompiler().compile(
+        environment,
+        options,
+        undefined,
+        true
+      );
+    return env.template(templateSpec);
+  }
+
+  // Template is only compiled on first use and cached after that point.
+  function ret(context, execOptions) {
+    if (!compiled) {
+      compiled = compileInput();
+    }
+    return compiled.call(this, context, execOptions);
+  }
+  ret._setup = function(setupOptions) {
+    if (!compiled) {
+      compiled = compileInput();
+    }
+    return compiled._setup(setupOptions);
+  };
+  ret._child = function(i, data, blockParams, depths) {
+    if (!compiled) {
+      compiled = compileInput();
+    }
+    return compiled._child(i, data, blockParams, depths);
+  };
+  return ret;
 }
 
 function argEquals(a, b) {
@@ -528,7 +597,7 @@ function transformLiteralToPath(sexpr) {
       depth: 0,
       parts: [literal.original + ''],
       original: literal.original + '',
-      loc: literal.loc,
+      loc: literal.loc
     };
   }
 }

lib/handlebars/compiler/helpers.js

@@ -0,0 +1,219 @@
+import Exception from '../exception';
+
+function validateClose(open, close) {
+  close = close.path ? close.path.original : close;
+
+  if (open.path.original !== close) {
+    let errorNode = { loc: open.path.loc };
+
+    throw new Exception(
+      open.path.original + " doesn't match " + close,
+      errorNode
+    );
+  }
+}
+
+export function SourceLocation(source, locInfo) {
+  this.source = source;
+  this.start = {
+    line: locInfo.first_line,
+    column: locInfo.first_column
+  };
+  this.end = {
+    line: locInfo.last_line,
+    column: locInfo.last_column
+  };
+}
+
+export function id(token) {
+  if (/^\[.*\]$/.test(token)) {
+    return token.substring(1, token.length - 1);
+  } else {
+    return token;
+  }
+}
+
+export function stripFlags(open, close) {
+  return {
+    open: open.charAt(2) === '~',
+    close: close.charAt(close.length - 3) === '~'
+  };
+}
+
+export function stripComment(comment) {
+  return comment.replace(/^\{\{~?!-?-?/, '').replace(/-?-?~?\}\}$/, '');
+}
+
+export function preparePath(data, parts, loc) {
+  loc = this.locInfo(loc);
+
+  let original = data ? '@' : '',
+    dig = [],
+    depth = 0;
+
+  for (let i = 0, l = parts.length; i < l; i++) {
+    let part = parts[i].part,
+      // If we have [] syntax then we do not treat path references as operators,
+      // i.e. foo.[this] resolves to approximately context.foo['this']
+      isLiteral = parts[i].original !== part;
+    original += (parts[i].separator || '') + part;
+
+    if (!isLiteral && (part === '..' || part === '.' || part === 'this')) {
+      if (dig.length > 0) {
+        throw new Exception('Invalid path: ' + original, { loc });
+      } else if (part === '..') {
+        depth++;
+      }
+    } else {
+      dig.push(part);
+    }
+  }
+
+  return {
+    type: 'PathExpression',
+    data,
+    depth,
+    parts: dig,
+    original,
+    loc
+  };
+}
+
+export function prepareMustache(path, params, hash, open, strip, locInfo) {
+  // Must use charAt to support IE pre-10
+  let escapeFlag = open.charAt(3) || open.charAt(2),
+    escaped = escapeFlag !== '{' && escapeFlag !== '&';
+
+  let decorator = /\*/.test(open);
+  return {
+    type: decorator ? 'Decorator' : 'MustacheStatement',
+    path,
+    params,
+    hash,
+    escaped,
+    strip,
+    loc: this.locInfo(locInfo)
+  };
+}
+
+export function prepareRawBlock(openRawBlock, contents, close, locInfo) {
+  validateClose(openRawBlock, close);
+
+  locInfo = this.locInfo(locInfo);
+  let program = {
+    type: 'Program',
+    body: contents,
+    strip: {},
+    loc: locInfo
+  };
+
+  return {
+    type: 'BlockStatement',
+    path: openRawBlock.path,
+    params: openRawBlock.params,
+    hash: openRawBlock.hash,
+    program,
+    openStrip: {},
+    inverseStrip: {},
+    closeStrip: {},
+    loc: locInfo
+  };
+}
+
+export function prepareBlock(
+  openBlock,
+  program,
+  inverseAndProgram,
+  close,
+  inverted,
+  locInfo
+) {
+  if (close && close.path) {
+    validateClose(openBlock, close);
+  }
+
+  let decorator = /\*/.test(openBlock.open);
+
+  program.blockParams = openBlock.blockParams;
+
+  let inverse, inverseStrip;
+
+  if (inverseAndProgram) {
+    if (decorator) {
+      throw new Exception(
+        'Unexpected inverse block on decorator',
+        inverseAndProgram
+      );
+    }
+
+    if (inverseAndProgram.chain) {
+      inverseAndProgram.program.body[0].closeStrip = close.strip;
+    }
+
+    inverseStrip = inverseAndProgram.strip;
+    inverse = inverseAndProgram.program;
+  }
+
+  if (inverted) {
+    inverted = inverse;
+    inverse = program;
+    program = inverted;
+  }
+
+  return {
+    type: decorator ? 'DecoratorBlock' : 'BlockStatement',
+    path: openBlock.path,
+    params: openBlock.params,
+    hash: openBlock.hash,
+    program,
+    inverse,
+    openStrip: openBlock.strip,
+    inverseStrip,
+    closeStrip: close && close.strip,
+    loc: this.locInfo(locInfo)
+  };
+}
+
+export function prepareProgram(statements, loc) {
+  if (!loc && statements.length) {
+    const firstLoc = statements[0].loc,
+      lastLoc = statements[statements.length - 1].loc;
+
+    /* istanbul ignore else */
+    if (firstLoc && lastLoc) {
+      loc = {
+        source: firstLoc.source,
+        start: {
+          line: firstLoc.start.line,
+          column: firstLoc.start.column
+        },
+        end: {
+          line: lastLoc.end.line,
+          column: lastLoc.end.column
+        }
+      };
+    }
+  }
+
+  return {
+    type: 'Program',
+    body: statements,
+    strip: {},
+    loc: loc
+  };
+}
+
+export function preparePartialBlock(open, program, close, locInfo) {
+  validateClose(open, close);
+
+  return {
+    type: 'PartialBlockStatement',
+    name: open.path,
+    params: open.params,
+    hash: open.hash,
+    program,
+    openStrip: open.strip,
+    closeStrip: close && close.strip,
+    loc: this.locInfo(locInfo)
+  };
+}

lib/handlebars/compiler/javascript-compiler.js

@@ -1,5 +1,5 @@
-import { Exception } from '@handlebars/parser';
 import { COMPILER_REVISION, REVISION_CHANGES } from '../base';
+import Exception from '../exception';
 import { isArray } from '../utils';
 import CodeGen from './code-gen';
 
@@ -12,25 +12,25 @@ function JavaScriptCompiler() {}
 JavaScriptCompiler.prototype = {
   // PUBLIC API: You can override these methods in a subclass to provide
   // alternative compiled forms for name lookup and buffering semantics
-  nameLookup: function (parent, name /*,  type */) {
+  nameLookup: function(parent, name /*,  type */) {
     return this.internalNameLookup(parent, name);
   },
-  depthedLookup: function (name) {
+  depthedLookup: function(name) {
     return [
       this.aliasable('container.lookup'),
       '(depths, ',
       JSON.stringify(name),
-      ')',
+      ')'
     ];
   },
 
-  compilerInfo: function () {
+  compilerInfo: function() {
     const revision = COMPILER_REVISION,
       versions = REVISION_CHANGES[revision];
     return [revision, versions];
   },
 
-  appendToBuffer: function (source, location, explicit) {
+  appendToBuffer: function(source, location, explicit) {
     // Force a source as this simplifies the merge logic.
     if (!isArray(source)) {
       source = [source];
@@ -50,20 +50,22 @@ JavaScriptCompiler.prototype = {
     }
   },
 
-  initializeBuffer: function () {
+  initializeBuffer: function() {
     return this.quotedString('');
   },
   // END PUBLIC API
-  internalNameLookup: function (parent, name) {
+  internalNameLookup: function(parent, name) {
     this.lookupPropertyFunctionIsUsed = true;
     return ['lookupProperty(', parent, ',', JSON.stringify(name), ')'];
   },
 
   lookupPropertyFunctionIsUsed: false,
 
-  compile: function (environment, options, context, asObject) {
+  compile: function(environment, options, context, asObject) {
     this.environment = environment;
     this.options = options;
+    this.stringParams = this.options.stringParams;
+    this.trackIds = this.options.trackIds;
     this.precompile = !asObject;
 
     this.name = this.environment.name;
@@ -71,7 +73,7 @@ JavaScriptCompiler.prototype = {
     this.context = context || {
       decorators: [],
       programs: [],
-      environments: [],
+      environments: []
     };
 
     this.preamble();
@@ -112,7 +114,7 @@ JavaScriptCompiler.prototype = {
     this.source.currentLocation = firstLoc;
     this.pushSource('');
 
-    /* v8 ignore next */
+    /* istanbul ignore next */
     if (this.stackSlot || this.inlineStack.length || this.compileStack.length) {
       throw new Exception('Compile completed with content left on stack');
     }
@@ -123,12 +125,11 @@ JavaScriptCompiler.prototype = {
       this.decorators.prepend([
         'var decorators = container.decorators, ',
         this.lookupPropertyFunctionVarDeclaration(),
-        ';\n',
+        ';\n'
       ]);
       this.decorators.push('return fn;');
 
       if (asObject) {
-        // eslint-disable-next-line no-new-func
         this.decorators = Function.apply(this, [
           'fn',
           'props',
@@ -137,7 +138,7 @@ JavaScriptCompiler.prototype = {
           'data',
           'blockParams',
           'depths',
-          this.decorators.merge(),
+          this.decorators.merge()
         ]);
       } else {
         this.decorators.prepend(
@@ -154,11 +155,11 @@ JavaScriptCompiler.prototype = {
     if (!this.isChild) {
       let ret = {
         compiler: this.compilerInfo(),
-        main: fn,
+        main: fn
       };
 
       if (this.decorators) {
-        ret.main_d = this.decorators;
+        ret.main_d = this.decorators; // eslint-disable-line camelcase
         ret.useDecorators = true;
       }
 
@@ -171,9 +172,6 @@ JavaScriptCompiler.prototype = {
         }
       }
 
-      // Release AST/compiler references only needed during compilation for dedup
-      this.context.environments.length = 0;
-
       if (this.environment.usePartial) {
         ret.usePartial = true;
       }
@@ -212,7 +210,7 @@ JavaScriptCompiler.prototype = {
     }
   },
 
-  preamble: function () {
+  preamble: function() {
     // track the last context pushed into place to allow skipping the
     // getContext opcode when it would be a noop
     this.lastContext = 0;
@@ -220,7 +218,7 @@ JavaScriptCompiler.prototype = {
     this.decorators = new CodeGen(this.options.srcName);
   },
 
-  createFunctionContext: function (asObject) {
+  createFunctionContext: function(asObject) {
     let varDeclarations = '';
 
     let locals = this.stackVars.concat(this.registers.list);
@@ -235,7 +233,7 @@ JavaScriptCompiler.prototype = {
     // aliases will not be used, but this case is already being run on the client and
     // we aren't concern about minimizing the template size.
     let aliasCount = 0;
-    Object.keys(this.aliases).forEach((alias) => {
+    Object.keys(this.aliases).forEach(alias => {
       let node = this.aliases[alias];
       if (node.children && node.referenceCount > 1) {
         varDeclarations += ', alias' + ++aliasCount + '=' + alias;
@@ -262,25 +260,25 @@ JavaScriptCompiler.prototype = {
     if (asObject) {
       params.push(source);
 
-      return Function.apply(this, params); // eslint-disable-line no-new-func
+      return Function.apply(this, params);
     } else {
       return this.source.wrap([
         'function(',
         params.join(','),
         ') {\n  ',
         source,
-        '}',
+        '}'
       ]);
     }
   },
-  mergeSource: function (varDeclarations) {
+  mergeSource: function(varDeclarations) {
     let isSimple = this.environment.isSimple,
       appendOnly = !this.forceBuffer,
       appendFirst,
       sourceSeen,
       bufferStart,
       bufferEnd;
-    this.source.each((line) => {
+    this.source.each(line => {
       if (line.appendToBuffer) {
         if (bufferStart) {
           line.prepend('  + ');
@@ -334,7 +332,7 @@ JavaScriptCompiler.prototype = {
     return this.source.merge();
   },
 
-  lookupPropertyFunctionVarDeclaration: function () {
+  lookupPropertyFunctionVarDeclaration: function() {
     return `
       lookupProperty = container.lookupProperty || function(parent, propertyName) {
         if (Object.prototype.hasOwnProperty.call(parent, propertyName)) {
@@ -354,7 +352,7 @@ JavaScriptCompiler.prototype = {
   // `{{#this.foo}}...{{/this.foo}}`, resolve the value of `foo`, and
   // replace it on the stack with the result of properly
   // invoking blockHelperMissing.
-  blockValue: function (name) {
+  blockValue: function(name) {
     let blockHelperMissing = this.aliasable(
         'container.hooks.blockHelperMissing'
       ),
@@ -373,7 +371,7 @@ JavaScriptCompiler.prototype = {
   // Compiler value, before: lastHelper=value of last found helper, if any
   // On stack, after, if no lastHelper: same as [blockValue]
   // On stack, after, if lastHelper: value
-  ambiguousBlockValue: function () {
+  ambiguousBlockValue: function() {
     // We're being a bit cheeky and reusing the options value from the prior exec
     let blockHelperMissing = this.aliasable(
         'container.hooks.blockHelperMissing'
@@ -393,7 +391,7 @@ JavaScriptCompiler.prototype = {
       current,
       ' = ',
       this.source.functionCall(blockHelperMissing, 'call', params),
-      '}',
+      '}'
     ]);
   },
 
@@ -403,7 +401,7 @@ JavaScriptCompiler.prototype = {
   // On stack, after: ...
   //
   // Appends the string value of `content` to the current buffer
-  appendContent: function (content) {
+  appendContent: function(content) {
     if (this.pendingContent) {
       content = this.pendingContent + content;
     } else {
@@ -422,9 +420,9 @@ JavaScriptCompiler.prototype = {
   //
   // If `value` is truthy, or 0, it is coerced into a string and appended
   // Otherwise, the empty string is appended
-  append: function () {
+  append: function() {
     if (this.isInline()) {
-      this.replaceStack((current) => [' != null ? ', current, ' : ""']);
+      this.replaceStack(current => [' != null ? ', current, ' : ""']);
 
       this.pushSource(this.appendToBuffer(this.popStack()));
     } else {
@@ -434,13 +432,13 @@ JavaScriptCompiler.prototype = {
         local,
         ' != null) { ',
         this.appendToBuffer(local, undefined, true),
-        ' }',
+        ' }'
       ]);
       if (this.environment.isSimple) {
         this.pushSource([
           'else { ',
           this.appendToBuffer("''", undefined, true),
-          ' }',
+          ' }'
         ]);
       }
     }
@@ -452,13 +450,13 @@ JavaScriptCompiler.prototype = {
   // On stack, after: ...
   //
   // Escape `value` and append it to the buffer
-  appendEscaped: function () {
+  appendEscaped: function() {
     this.pushSource(
       this.appendToBuffer([
         this.aliasable('container.escapeExpression'),
         '(',
         this.popStack(),
-        ')',
+        ')'
       ])
     );
   },
@@ -470,7 +468,7 @@ JavaScriptCompiler.prototype = {
   // Compiler value, after: lastContext=depth
   //
   // Set the value of the `lastContext` compiler value to the depth
-  getContext: function (depth) {
+  getContext: function(depth) {
     this.lastContext = depth;
   },
 
@@ -480,7 +478,7 @@ JavaScriptCompiler.prototype = {
   // On stack, after: currentContext, ...
   //
   // Pushes the value of the current context onto the stack.
-  pushContext: function () {
+  pushContext: function() {
     this.pushStackLiteral(this.contextName(this.lastContext));
   },
 
@@ -491,7 +489,7 @@ JavaScriptCompiler.prototype = {
   //
   // Looks up the value of `name` on the current context and pushes
   // it onto the stack.
-  lookupOnContext: function (parts, falsy, strict, scoped) {
+  lookupOnContext: function(parts, falsy, strict, scoped) {
     let i = 0;
 
     if (!scoped && this.options.compat && !this.lastContext) {
@@ -512,7 +510,7 @@ JavaScriptCompiler.prototype = {
   //
   // Looks up the value of `parts` on the given block param and pushes
   // it onto the stack.
-  lookupBlockParam: function (blockParamId, parts) {
+  lookupBlockParam: function(blockParamId, parts) {
     this.useBlockParams = true;
 
     this.push(['blockParams[', blockParamId[0], '][', blockParamId[1], ']']);
@@ -525,7 +523,7 @@ JavaScriptCompiler.prototype = {
   // On stack, after: data, ...
   //
   // Push the data lookup operator
-  lookupData: function (depth, parts, strict) {
+  lookupData: function(depth, parts, strict) {
     if (!depth) {
       this.pushStackLiteral('data');
     } else {
@@ -535,7 +533,7 @@ JavaScriptCompiler.prototype = {
     this.resolvePath('data', parts, 0, true, strict);
   },
 
-  resolvePath: function (type, parts, startPartIndex, falsy, strict) {
+  resolvePath: function(type, parts, startPartIndex, falsy, strict) {
     if (this.options.strict || this.options.assumeObjects) {
       this.push(
         strictLookup(
@@ -552,7 +550,7 @@ JavaScriptCompiler.prototype = {
     let len = parts.length;
     for (let i = startPartIndex; i < len; i++) {
       /* eslint-disable no-loop-func */
-      this.replaceStack((current) => {
+      this.replaceStack(current => {
         let lookup = this.nameLookup(current, parts[i], type);
         // We want to ensure that zero and false are handled properly if the context (falsy flag)
         // needs to have the special handling for these values.
@@ -574,30 +572,68 @@ JavaScriptCompiler.prototype = {
   //
   // If the `value` is a lambda, replace it on the stack by
   // the return value of the lambda
-  resolvePossibleLambda: function () {
+  resolvePossibleLambda: function() {
     this.push([
       this.aliasable('container.lambda'),
       '(',
       this.popStack(),
       ', ',
       this.contextName(0),
-      ')',
+      ')'
     ]);
   },
 
-  emptyHash: function (omitEmpty) {
+  // [pushStringParam]
+  //
+  // On stack, before: ...
+  // On stack, after: string, currentContext, ...
+  //
+  // This opcode is designed for use in string mode, which
+  // provides the string value of a parameter along with its
+  // depth rather than resolving it immediately.
+  pushStringParam: function(string, type) {
+    this.pushContext();
+    this.pushString(type);
+
+    // If it's a subexpression, the string result
+    // will be pushed after this opcode.
+    if (type !== 'SubExpression') {
+      if (typeof string === 'string') {
+        this.pushString(string);
+      } else {
+        this.pushStackLiteral(string);
+      }
+    }
+  },
+
+  emptyHash: function(omitEmpty) {
+    if (this.trackIds) {
+      this.push('{}'); // hashIds
+    }
+    if (this.stringParams) {
+      this.push('{}'); // hashContexts
+      this.push('{}'); // hashTypes
+    }
     this.pushStackLiteral(omitEmpty ? 'undefined' : '{}');
   },
-  pushHash: function () {
+  pushHash: function() {
     if (this.hash) {
       this.hashes.push(this.hash);
     }
-    this.hash = { values: {} };
+    this.hash = { values: {}, types: [], contexts: [], ids: [] };
   },
-  popHash: function () {
+  popHash: function() {
     let hash = this.hash;
     this.hash = this.hashes.pop();
 
+    if (this.trackIds) {
+      this.push(this.objectLiteral(hash.ids));
+    }
+    if (this.stringParams) {
+      this.push(this.objectLiteral(hash.contexts));
+      this.push(this.objectLiteral(hash.types));
+    }
+
     this.push(this.objectLiteral(hash.values));
   },
 
@@ -607,7 +643,7 @@ JavaScriptCompiler.prototype = {
   // On stack, after: quotedString(string), ...
   //
   // Push a quoted version of `string` onto the stack
-  pushString: function (string) {
+  pushString: function(string) {
     this.pushStackLiteral(this.quotedString(string));
   },
 
@@ -619,7 +655,7 @@ JavaScriptCompiler.prototype = {
   // Pushes a value onto the stack. This operation prevents
   // the compiler from creating a temporary variable to hold
   // it.
-  pushLiteral: function (value) {
+  pushLiteral: function(value) {
     this.pushStackLiteral(value);
   },
 
@@ -631,7 +667,7 @@ JavaScriptCompiler.prototype = {
   // Push a program expression onto the stack. This takes
   // a compile-time guid and converts it into a runtime-accessible
   // expression.
-  pushProgram: function (guid) {
+  pushProgram: function(guid) {
     if (guid != null) {
       this.pushStackLiteral(this.programExpression(guid));
     } else {
@@ -650,15 +686,24 @@ JavaScriptCompiler.prototype = {
     let foundDecorator = this.nameLookup('decorators', name, 'decorator'),
       options = this.setupHelperArgs(name, paramSize);
 
+    // Store the resolved decorator in a variable and verify it is a function before
+    // calling it. Without this, unregistered decorators can cause an unhandled TypeError
+    // (calling undefined), which crashes the process — enabling Denial of Service.
+    this.decorators.push(['var decorator = ', foundDecorator, ';']);
+    this.decorators.push([
+      'if (typeof decorator !== "function") { throw new Error(',
+      this.quotedString('Missing decorator: "' + name + '"'),
+      '); }'
+    ]);
     this.decorators.push([
       'fn = ',
-      this.decorators.functionCall(foundDecorator, '', [
+      this.decorators.functionCall('decorator', '', [
         'fn',
         'props',
         'container',
-        options,
+        options
       ]),
-      ' || fn;',
+      ' || fn;'
     ]);
   },
 
@@ -671,7 +716,7 @@ JavaScriptCompiler.prototype = {
   // and pushes the helper's return value onto the stack.
   //
   // If the helper is not found, `helperMissing` is called.
-  invokeHelper: function (paramSize, name, isSimple) {
+  invokeHelper: function(paramSize, name, isSimple) {
     let nonHelper = this.popStack(),
       helper = this.setupHelper(paramSize, name);
 
@@ -692,7 +737,7 @@ JavaScriptCompiler.prototype = {
     let functionLookupCode = [
       '(',
       this.itemsSeparatedBy(possibleFunctionCalls, '||'),
-      ')',
+      ')'
     ];
     let functionCall = this.source.functionCall(
       functionLookupCode,
@@ -702,7 +747,7 @@ JavaScriptCompiler.prototype = {
     this.push(functionCall);
   },
 
-  itemsSeparatedBy: function (items, separator) {
+  itemsSeparatedBy: function(items, separator) {
     let result = [];
     result.push(items[0]);
     for (let i = 1; i < items.length; i++) {
@@ -717,7 +762,7 @@ JavaScriptCompiler.prototype = {
   //
   // This operation is used when the helper is known to exist,
   // so a `helperMissing` fallback is not required.
-  invokeKnownHelper: function (paramSize, name) {
+  invokeKnownHelper: function(paramSize, name) {
     let helper = this.setupHelper(paramSize, name);
     this.push(this.source.functionCall(helper.name, 'call', helper.callParams));
   },
@@ -734,7 +779,7 @@ JavaScriptCompiler.prototype = {
   // This operation emits more code than the other options,
   // and can be avoided by passing the `knownHelpers` and
   // `knownHelpersOnly` flags at compile-time.
-  invokeAmbiguous: function (name, helperCall) {
+  invokeAmbiguous: function(name, helperCall) {
     this.useRegister('helper');
 
     let nonHelper = this.popStack();
@@ -766,7 +811,7 @@ JavaScriptCompiler.prototype = {
       this.aliasable('"function"'),
       ' ? ',
       this.source.functionCall('helper', 'call', helper.callParams),
-      ' : helper))',
+      ' : helper))'
     ]);
   },
 
@@ -777,7 +822,7 @@ JavaScriptCompiler.prototype = {
   //
   // This operation pops off a context, invokes a partial with that context,
   // and pushes the result of the invocation back.
-  invokePartial: function (isDynamic, name, indent) {
+  invokePartial: function(isDynamic, name, indent) {
     let params = [],
       options = this.setupParams(name, 1, params);
 
@@ -814,22 +859,64 @@ JavaScriptCompiler.prototype = {
   // On stack, after: ..., hash, ...
   //
   // Pops a value off the stack and assigns it to the current hash
-  assignToHash: function (key) {
+  assignToHash: function(key) {
-    this.hash.values[key] = this.popStack();
+    let value = this.popStack(),
+      context,
+      type,
+      id;
+
+    if (this.trackIds) {
+      id = this.popStack();
+    }
+    if (this.stringParams) {
+      type = this.popStack();
+      context = this.popStack();
+    }
+
+    let hash = this.hash;
+    if (context) {
+      hash.contexts[key] = context;
+    }
+    if (type) {
+      hash.types[key] = type;
+    }
+    if (id) {
+      hash.ids[key] = id;
+    }
+    hash.values[key] = value;
+  },
+
+  pushId: function(type, name, child) {
+    if (type === 'BlockParam') {
+      this.pushStackLiteral(
+        'blockParams[' +
+          name[0] +
+          '].path[' +
+          name[1] +
+          ']' +
+          (child ? ' + ' + JSON.stringify('.' + child) : '')
+      );
+    } else if (type === 'PathExpression') {
+      this.pushString(name);
+    } else if (type === 'SubExpression') {
+      this.pushStackLiteral('true');
+    } else {
+      this.pushStackLiteral('null');
+    }
   },
 
   // HELPERS
 
   compiler: JavaScriptCompiler,
 
-  compileChildren: function (environment, options) {
+  compileChildren: function(environment, options) {
     let children = environment.children,
       child,
       compiler;
 
     for (let i = 0, l = children.length; i < l; i++) {
       child = children[i];
-      compiler = new this.compiler();
+      compiler = new this.compiler(); // eslint-disable-line new-cap
 
       let existing = this.matchExistingProgram(child);
 
@@ -860,7 +947,7 @@ JavaScriptCompiler.prototype = {
       }
     }
   },
-  matchExistingProgram: function (child) {
+  matchExistingProgram: function(child) {
     for (let i = 0, len = this.context.environments.length; i < len; i++) {
       let environment = this.context.environments[i];
       if (environment && environment.equals(child)) {
@@ -869,7 +956,7 @@ JavaScriptCompiler.prototype = {
     }
   },
 
-  programExpression: function (guid) {
+  programExpression: function(guid) {
     let child = this.environment.children[guid],
       programParams = [child.index, 'data', child.blockParams];
 
@@ -883,14 +970,14 @@ JavaScriptCompiler.prototype = {
     return 'container.program(' + programParams.join(', ') + ')';
   },
 
-  useRegister: function (name) {
+  useRegister: function(name) {
     if (!this.registers[name]) {
       this.registers[name] = true;
       this.registers.list.push(name);
     }
   },
 
-  push: function (expr) {
+  push: function(expr) {
     if (!(expr instanceof Literal)) {
       expr = this.source.wrap(expr);
     }
@@ -899,11 +986,11 @@ JavaScriptCompiler.prototype = {
     return expr;
   },
 
-  pushStackLiteral: function (item) {
+  pushStackLiteral: function(item) {
     this.push(new Literal(item));
   },
 
-  pushSource: function (source) {
+  pushSource: function(source) {
     if (this.pendingContent) {
       this.source.push(
         this.appendToBuffer(
@@ -919,13 +1006,13 @@ JavaScriptCompiler.prototype = {
     }
   },
 
-  replaceStack: function (callback) {
+  replaceStack: function(callback) {
     let prefix = ['('],
       stack,
       createdStack,
       usedLiteral;
 
-    /* v8 ignore next */
+    /* istanbul ignore next */
     if (!this.isInline()) {
       throw new Exception('replaceStack on non-inline');
     }
@@ -958,22 +1045,22 @@ JavaScriptCompiler.prototype = {
     this.push(prefix.concat(item, ')'));
   },
 
-  incrStack: function () {
+  incrStack: function() {
     this.stackSlot++;
     if (this.stackSlot > this.stackVars.length) {
       this.stackVars.push('stack' + this.stackSlot);
     }
     return this.topStackName();
   },
-  topStackName: function () {
+  topStackName: function() {
     return 'stack' + this.stackSlot;
   },
-  flushInline: function () {
+  flushInline: function() {
     let inlineStack = this.inlineStack;
     this.inlineStack = [];
     for (let i = 0, len = inlineStack.length; i < len; i++) {
       let entry = inlineStack[i];
-      /* v8 ignore next */
+      /* istanbul ignore if */
       if (entry instanceof Literal) {
         this.compileStack.push(entry);
       } else {
@@ -983,11 +1070,11 @@ JavaScriptCompiler.prototype = {
       }
     }
   },
-  isInline: function () {
+  isInline: function() {
     return this.inlineStack.length;
   },
 
-  popStack: function (wrapped) {
+  popStack: function(wrapped) {
     let inline = this.isInline(),
       item = (inline ? this.inlineStack : this.compileStack).pop();
 
@@ -995,7 +1082,7 @@ JavaScriptCompiler.prototype = {
       return item.value;
     } else {
       if (!inline) {
-        /* v8 ignore next */
+        /* istanbul ignore next */
         if (!this.stackSlot) {
           throw new Exception('Invalid stack pop');
         }
@@ -1005,11 +1092,11 @@ JavaScriptCompiler.prototype = {
     }
   },
 
-  topStack: function () {
+  topStack: function() {
     let stack = this.isInline() ? this.inlineStack : this.compileStack,
       item = stack[stack.length - 1];
 
-    /* v8 ignore next */
+    /* istanbul ignore if */
     if (item instanceof Literal) {
       return item.value;
     } else {
@@ -1017,7 +1104,7 @@ JavaScriptCompiler.prototype = {
     }
   },
 
-  contextName: function (context) {
+  contextName: function(context) {
     if (this.useDepths && context) {
       return 'depths[' + context + ']';
     } else {
@@ -1025,15 +1112,15 @@ JavaScriptCompiler.prototype = {
     }
   },
 
-  quotedString: function (str) {
+  quotedString: function(str) {
     return this.source.quotedString(str);
   },
 
-  objectLiteral: function (obj) {
+  objectLiteral: function(obj) {
     return this.source.objectLiteral(obj);
   },
 
-  aliasable: function (name) {
+  aliasable: function(name) {
     let ret = this.aliases[name];
     if (ret) {
       ret.referenceCount++;
@@ -1047,7 +1134,7 @@ JavaScriptCompiler.prototype = {
     return ret;
   },
 
-  setupHelper: function (paramSize, name, blockHelper) {
+  setupHelper: function(paramSize, name, blockHelper) {
     let params = [],
       paramsInit = this.setupHelperArgs(name, paramSize, params, blockHelper);
     let foundHelper = this.nameLookup('helpers', name, 'helper'),
@@ -1061,12 +1148,15 @@ JavaScriptCompiler.prototype = {
       params: params,
       paramsInit: paramsInit,
       name: foundHelper,
-      callParams: [callContext].concat(params),
+      callParams: [callContext].concat(params)
     };
   },
 
-  setupParams: function (helper, paramSize, params) {
+  setupParams: function(helper, paramSize, params) {
     let options = {},
+      contexts = [],
+      types = [],
+      ids = [],
       objectArgs = !params,
       param;
 
@@ -1077,6 +1167,14 @@ JavaScriptCompiler.prototype = {
     options.name = this.quotedString(helper);
     options.hash = this.popStack();
 
+    if (this.trackIds) {
+      options.hashIds = this.popStack();
+    }
+    if (this.stringParams) {
+      options.hashTypes = this.popStack();
+      options.hashContexts = this.popStack();
+    }
+
     let inverse = this.popStack(),
       program = this.popStack();
 
@@ -1093,12 +1191,28 @@ JavaScriptCompiler.prototype = {
     while (i--) {
       param = this.popStack();
       params[i] = param;
+
+      if (this.trackIds) {
+        ids[i] = this.popStack();
+      }
+      if (this.stringParams) {
+        types[i] = this.popStack();
+        contexts[i] = this.popStack();
+      }
     }
 
     if (objectArgs) {
       options.args = this.source.generateArray(params);
     }
 
+    if (this.trackIds) {
+      options.ids = this.source.generateArray(ids);
+    }
+    if (this.stringParams) {
+      options.types = this.source.generateArray(types);
+      options.contexts = this.source.generateArray(contexts);
+    }
+
     if (this.options.data) {
       options.data = 'data';
     }
@@ -1108,7 +1222,7 @@ JavaScriptCompiler.prototype = {
     return options;
   },
 
-  setupHelperArgs: function (helper, paramSize, params, useRegister) {
+  setupHelperArgs: function(helper, paramSize, params, useRegister) {
     let options = this.setupParams(helper, paramSize, params);
     options.loc = JSON.stringify(this.source.currentLocation);
     options = this.objectLiteral(options);
@@ -1122,10 +1236,10 @@ JavaScriptCompiler.prototype = {
     } else {
       return options;
     }
-  },
+  }
 };
 
-(function () {
+(function() {
   const reservedWords = (
     'break else new var' +
     ' case finally return void' +
@@ -1155,7 +1269,7 @@ JavaScriptCompiler.prototype = {
 /**
  * @deprecated May be removed in the next major version
  */
-JavaScriptCompiler.isValidJavaScriptVariableName = function (name) {
+JavaScriptCompiler.isValidJavaScriptVariableName = function(name) {
   return (
     !JavaScriptCompiler.RESERVED_WORDS[name] &&
     /^[a-zA-Z_$][0-9a-zA-Z_$]*$/.test(name)
@@ -1182,7 +1296,7 @@ function strictLookup(requireTerminal, compiler, parts, startPartIndex, type) {
       compiler.quotedString(parts[len]),
       ', ',
       JSON.stringify(compiler.source.currentLocation),
-      ' )',
+      ' )'
     ];
   } else {
     return stack;

lib/handlebars/compiler/printer.js

@@ -0,0 +1,178 @@
+/* eslint-disable new-cap */
+import Visitor from './visitor';
+
+export function print(ast) {
+  return new PrintVisitor().accept(ast);
+}
+
+export function PrintVisitor() {
+  this.padding = 0;
+}
+
+PrintVisitor.prototype = new Visitor();
+
+PrintVisitor.prototype.pad = function(string) {
+  let out = '';
+
+  for (let i = 0, l = this.padding; i < l; i++) {
+    out += '  ';
+  }
+
+  out += string + '\n';
+  return out;
+};
+
+PrintVisitor.prototype.Program = function(program) {
+  let out = '',
+    body = program.body,
+    i,
+    l;
+
+  if (program.blockParams) {
+    let blockParams = 'BLOCK PARAMS: [';
+    for (i = 0, l = program.blockParams.length; i < l; i++) {
+      blockParams += ' ' + program.blockParams[i];
+    }
+    blockParams += ' ]';
+    out += this.pad(blockParams);
+  }
+
+  for (i = 0, l = body.length; i < l; i++) {
+    out += this.accept(body[i]);
+  }
+
+  this.padding--;
+
+  return out;
+};
+
+PrintVisitor.prototype.MustacheStatement = function(mustache) {
+  return this.pad('{{ ' + this.SubExpression(mustache) + ' }}');
+};
+PrintVisitor.prototype.Decorator = function(mustache) {
+  return this.pad('{{ DIRECTIVE ' + this.SubExpression(mustache) + ' }}');
+};
+
+PrintVisitor.prototype.BlockStatement = PrintVisitor.prototype.DecoratorBlock = function(
+  block
+) {
+  let out = '';
+
+  out += this.pad(
+    (block.type === 'DecoratorBlock' ? 'DIRECTIVE ' : '') + 'BLOCK:'
+  );
+  this.padding++;
+  out += this.pad(this.SubExpression(block));
+  if (block.program) {
+    out += this.pad('PROGRAM:');
+    this.padding++;
+    out += this.accept(block.program);
+    this.padding--;
+  }
+  if (block.inverse) {
+    if (block.program) {
+      this.padding++;
+    }
+    out += this.pad('{{^}}');
+    this.padding++;
+    out += this.accept(block.inverse);
+    this.padding--;
+    if (block.program) {
+      this.padding--;
+    }
+  }
+  this.padding--;
+
+  return out;
+};
+
+PrintVisitor.prototype.PartialStatement = function(partial) {
+  let content = 'PARTIAL:' + partial.name.original;
+  if (partial.params[0]) {
+    content += ' ' + this.accept(partial.params[0]);
+  }
+  if (partial.hash) {
+    content += ' ' + this.accept(partial.hash);
+  }
+  return this.pad('{{> ' + content + ' }}');
+};
+PrintVisitor.prototype.PartialBlockStatement = function(partial) {
+  let content = 'PARTIAL BLOCK:' + partial.name.original;
+  if (partial.params[0]) {
+    content += ' ' + this.accept(partial.params[0]);
+  }
+  if (partial.hash) {
+    content += ' ' + this.accept(partial.hash);
+  }
+
+  content += ' ' + this.pad('PROGRAM:');
+  this.padding++;
+  content += this.accept(partial.program);
+  this.padding--;
+
+  return this.pad('{{> ' + content + ' }}');
+};
+
+PrintVisitor.prototype.ContentStatement = function(content) {
+  return this.pad("CONTENT[ '" + content.value + "' ]");
+};
+
+PrintVisitor.prototype.CommentStatement = function(comment) {
+  return this.pad("{{! '" + comment.value + "' }}");
+};
+
+PrintVisitor.prototype.SubExpression = function(sexpr) {
+  let params = sexpr.params,
+    paramStrings = [],
+    hash;
+
+  for (let i = 0, l = params.length; i < l; i++) {
+    paramStrings.push(this.accept(params[i]));
+  }
+
+  params = '[' + paramStrings.join(', ') + ']';
+
+  hash = sexpr.hash ? ' ' + this.accept(sexpr.hash) : '';
+
+  return this.accept(sexpr.path) + ' ' + params + hash;
+};
+
+PrintVisitor.prototype.PathExpression = function(id) {
+  let path = id.parts.join('/');
+  return (id.data ? '@' : '') + 'PATH:' + path;
+};
+
+PrintVisitor.prototype.StringLiteral = function(string) {
+  return '"' + string.value + '"';
+};
+
+PrintVisitor.prototype.NumberLiteral = function(number) {
+  return 'NUMBER{' + number.value + '}';
+};
+
+PrintVisitor.prototype.BooleanLiteral = function(bool) {
+  return 'BOOLEAN{' + bool.value + '}';
+};
+
+PrintVisitor.prototype.UndefinedLiteral = function() {
+  return 'UNDEFINED';
+};
+
+PrintVisitor.prototype.NullLiteral = function() {
+  return 'NULL';
+};
+
+PrintVisitor.prototype.Hash = function(hash) {
+  let pairs = hash.pairs,
+    joinedPairs = [];
+
+  for (let i = 0, l = pairs.length; i < l; i++) {
+    joinedPairs.push(this.accept(pairs[i]));
+  }
+
+  return 'HASH{' + joinedPairs.join(', ') + '}';
+};
+PrintVisitor.prototype.HashPair = function(pair) {
+  return pair.key + '=' + this.accept(pair.value);
+};
+/* eslint-enable new-cap */

lib/handlebars/compiler/visitor.js

@@ -0,0 +1,136 @@
+import Exception from '../exception';
+
+function Visitor() {
+  this.parents = [];
+}
+
+Visitor.prototype = {
+  constructor: Visitor,
+  mutating: false,
+
+  // Visits a given value. If mutating, will replace the value if necessary.
+  acceptKey: function(node, name) {
+    let value = this.accept(node[name]);
+    if (this.mutating) {
+      // Hacky sanity check: This may have a few false positives for type for the helper
+      // methods but will generally do the right thing without a lot of overhead.
+      if (value && !Visitor.prototype[value.type]) {
+        throw new Exception(
+          'Unexpected node type "' +
+            value.type +
+            '" found when accepting ' +
+            name +
+            ' on ' +
+            node.type
+        );
+      }
+      node[name] = value;
+    }
+  },
+
+  // Performs an accept operation with added sanity check to ensure
+  // required keys are not removed.
+  acceptRequired: function(node, name) {
+    this.acceptKey(node, name);
+
+    if (!node[name]) {
+      throw new Exception(node.type + ' requires ' + name);
+    }
+  },
+
+  // Traverses a given array. If mutating, empty respnses will be removed
+  // for child elements.
+  acceptArray: function(array) {
+    for (let i = 0, l = array.length; i < l; i++) {
+      this.acceptKey(array, i);
+
+      if (!array[i]) {
+        array.splice(i, 1);
+        i--;
+        l--;
+      }
+    }
+  },
+
+  accept: function(object) {
+    if (!object) {
+      return;
+    }
+
+    /* istanbul ignore next: Sanity code */
+    if (!this[object.type]) {
+      throw new Exception('Unknown type: ' + object.type, object);
+    }
+
+    if (this.current) {
+      this.parents.unshift(this.current);
+    }
+    this.current = object;
+
+    let ret = this[object.type](object);
+
+    this.current = this.parents.shift();
+
+    if (!this.mutating || ret) {
+      return ret;
+    } else if (ret !== false) {
+      return object;
+    }
+  },
+
+  Program: function(program) {
+    this.acceptArray(program.body);
+  },
+
+  MustacheStatement: visitSubExpression,
+  Decorator: visitSubExpression,
+
+  BlockStatement: visitBlock,
+  DecoratorBlock: visitBlock,
+
+  PartialStatement: visitPartial,
+  PartialBlockStatement: function(partial) {
+    visitPartial.call(this, partial);
+
+    this.acceptKey(partial, 'program');
+  },
+
+  ContentStatement: function(/* content */) {},
+  CommentStatement: function(/* comment */) {},
+
+  SubExpression: visitSubExpression,
+
+  PathExpression: function(/* path */) {},
+
+  StringLiteral: function(/* string */) {},
+  NumberLiteral: function(/* number */) {},
+  BooleanLiteral: function(/* bool */) {},
+  UndefinedLiteral: function(/* literal */) {},
+  NullLiteral: function(/* literal */) {},
+
+  Hash: function(hash) {
+    this.acceptArray(hash.pairs);
+  },
+  HashPair: function(pair) {
+    this.acceptRequired(pair, 'value');
+  }
+};
+
+function visitSubExpression(mustache) {
+  this.acceptRequired(mustache, 'path');
+  this.acceptArray(mustache.params);
+  this.acceptKey(mustache, 'hash');
+}
+function visitBlock(block) {
+  visitSubExpression.call(this, block);
+
+  this.acceptKey(block, 'program');
+  this.acceptKey(block, 'inverse');
+}
+function visitPartial(partial) {
+  this.acceptRequired(partial, 'name');
+  this.acceptArray(partial.params);
+  this.acceptKey(partial, 'hash');
+}
+
+export default Visitor;

lib/handlebars/compiler/whitespace-control.js

@@ -0,0 +1,234 @@
+import Visitor from './visitor';
+
+function WhitespaceControl(options = {}) {
+  this.options = options;
+}
+WhitespaceControl.prototype = new Visitor();
+
+WhitespaceControl.prototype.Program = function(program) {
+  const doStandalone = !this.options.ignoreStandalone;
+
+  let isRoot = !this.isRootSeen;
+  this.isRootSeen = true;
+
+  let body = program.body;
+  for (let i = 0, l = body.length; i < l; i++) {
+    let current = body[i],
+      strip = this.accept(current);
+
+    if (!strip) {
+      continue;
+    }
+
+    let _isPrevWhitespace = isPrevWhitespace(body, i, isRoot),
+      _isNextWhitespace = isNextWhitespace(body, i, isRoot),
+      openStandalone = strip.openStandalone && _isPrevWhitespace,
+      closeStandalone = strip.closeStandalone && _isNextWhitespace,
+      inlineStandalone =
+        strip.inlineStandalone && _isPrevWhitespace && _isNextWhitespace;
+
+    if (strip.close) {
+      omitRight(body, i, true);
+    }
+    if (strip.open) {
+      omitLeft(body, i, true);
+    }
+
+    if (doStandalone && inlineStandalone) {
+      omitRight(body, i);
+
+      if (omitLeft(body, i)) {
+        // If we are on a standalone node, save the indent info for partials
+        if (current.type === 'PartialStatement') {
+          // Pull out the whitespace from the final line
+          current.indent = /([ \t]+$)/.exec(body[i - 1].original)[1];
+        }
+      }
+    }
+    if (doStandalone && openStandalone) {
+      omitRight((current.program || current.inverse).body);
+
+      // Strip out the previous content node if it's whitespace only
+      omitLeft(body, i);
+    }
+    if (doStandalone && closeStandalone) {
+      // Always strip the next node
+      omitRight(body, i);
+
+      omitLeft((current.inverse || current.program).body);
+    }
+  }
+
+  return program;
+};
+
+WhitespaceControl.prototype.BlockStatement = WhitespaceControl.prototype.DecoratorBlock = WhitespaceControl.prototype.PartialBlockStatement = function(
+  block
+) {
+  this.accept(block.program);
+  this.accept(block.inverse);
+
+  // Find the inverse program that is involed with whitespace stripping.
+  let program = block.program || block.inverse,
+    inverse = block.program && block.inverse,
+    firstInverse = inverse,
+    lastInverse = inverse;
+
+  if (inverse && inverse.chained) {
+    firstInverse = inverse.body[0].program;
+
+    // Walk the inverse chain to find the last inverse that is actually in the chain.
+    while (lastInverse.chained) {
+      lastInverse = lastInverse.body[lastInverse.body.length - 1].program;
+    }
+  }
+
+  let strip = {
+    open: block.openStrip.open,
+    close: block.closeStrip.close,
+
+    // Determine the standalone candiacy. Basically flag our content as being possibly standalone
+    // so our parent can determine if we actually are standalone
+    openStandalone: isNextWhitespace(program.body),
+    closeStandalone: isPrevWhitespace((firstInverse || program).body)
+  };
+
+  if (block.openStrip.close) {
+    omitRight(program.body, null, true);
+  }
+
+  if (inverse) {
+    let inverseStrip = block.inverseStrip;
+
+    if (inverseStrip.open) {
+      omitLeft(program.body, null, true);
+    }
+
+    if (inverseStrip.close) {
+      omitRight(firstInverse.body, null, true);
+    }
+    if (block.closeStrip.open) {
+      omitLeft(lastInverse.body, null, true);
+    }
+
+    // Find standalone else statments
+    if (
+      !this.options.ignoreStandalone &&
+      isPrevWhitespace(program.body) &&
+      isNextWhitespace(firstInverse.body)
+    ) {
+      omitLeft(program.body);
+      omitRight(firstInverse.body);
+    }
+  } else if (block.closeStrip.open) {
+    omitLeft(program.body, null, true);
+  }
+
+  return strip;
+};
+
+WhitespaceControl.prototype.Decorator = WhitespaceControl.prototype.MustacheStatement = function(
+  mustache
+) {
+  return mustache.strip;
+};
+
+WhitespaceControl.prototype.PartialStatement = WhitespaceControl.prototype.CommentStatement = function(
+  node
+) {
+  /* istanbul ignore next */
+  let strip = node.strip || {};
+  return {
+    inlineStandalone: true,
+    open: strip.open,
+    close: strip.close
+  };
+};
+
+function isPrevWhitespace(body, i, isRoot) {
+  if (i === undefined) {
+    i = body.length;
+  }
+
+  // Nodes that end with newlines are considered whitespace (but are special
+  // cased for strip operations)
+  let prev = body[i - 1],
+    sibling = body[i - 2];
+  if (!prev) {
+    return isRoot;
+  }
+
+  if (prev.type === 'ContentStatement') {
+    return (sibling || !isRoot ? /\r?\n\s*?$/ : /(^|\r?\n)\s*?$/).test(
+      prev.original
+    );
+  }
+}
+function isNextWhitespace(body, i, isRoot) {
+  if (i === undefined) {
+    i = -1;
+  }
+
+  let next = body[i + 1],
+    sibling = body[i + 2];
+  if (!next) {
+    return isRoot;
+  }
+
+  if (next.type === 'ContentStatement') {
+    return (sibling || !isRoot ? /^\s*?\r?\n/ : /^\s*?(\r?\n|$)/).test(
+      next.original
+    );
+  }
+}
+
+// Marks the node to the right of the position as omitted.
+// I.e. {{foo}}' ' will mark the ' ' node as omitted.
+//
+// If i is undefined, then the first child will be marked as such.
+//
+// If mulitple is truthy then all whitespace will be stripped out until non-whitespace
+// content is met.
+function omitRight(body, i, multiple) {
+  let current = body[i == null ? 0 : i + 1];
+  if (
+    !current ||
+    current.type !== 'ContentStatement' ||
+    (!multiple && current.rightStripped)
+  ) {
+    return;
+  }
+
+  let original = current.value;
+  current.value = current.value.replace(
+    multiple ? /^\s+/ : /^[ \t]*\r?\n?/,
+    ''
+  );
+  current.rightStripped = current.value !== original;
+}
+
+// Marks the node to the left of the position as omitted.
+// I.e. ' '{{foo}} will mark the ' ' node as omitted.
+//
+// If i is undefined then the last child will be marked as such.
+//
+// If mulitple is truthy then all whitespace will be stripped out until non-whitespace
+// content is met.
+function omitLeft(body, i, multiple) {
+  let current = body[i == null ? body.length - 1 : i - 1];
+  if (
+    !current ||
+    current.type !== 'ContentStatement' ||
+    (!multiple && current.leftStripped)
+  ) {
+    return;
+  }
+
+  // We omit the last node if it's whitespace only and not preceded by a non-content node.
+  let original = current.value;
+  current.value = current.value.replace(multiple ? /\s+$/ : /[ \t]+$/, '');
+  current.leftStripped = current.value !== original;
+  return current.leftStripped;
+}
+
+export default WhitespaceControl;

lib/handlebars/decorators/inline.js

@@ -1,25 +1,22 @@
 import { extend } from '../utils';
 
-export default function (instance) {
+export default function(instance) {
-  instance.registerDecorator(
+  instance.registerDecorator('inline', function(fn, props, container, options) {
-    'inline',
+    let ret = fn;
-    function (fn, props, container, options) {
+    if (!props.partials) {
-      let ret = fn;
+      props.partials = {};
-      if (!props.partials) {
+      ret = function(context, options) {
-        props.partials = {};
+        // Create a new partials stack frame prior to exec.
-        ret = function (context, options) {
+        let original = container.partials;
-          // Create a new partials stack frame prior to exec.
+        container.partials = extend({}, original, props.partials);
-          let original = container.partials;
+        let ret = fn(context, options);
-          container.partials = extend({}, original, props.partials);
+        container.partials = original;
-          let ret = fn(context, options);
+        return ret;
-          container.partials = original;
+      };
-          return ret;
-        };
-      }
-
-      props.partials[options.args[0]] = options.fn;
-
-      return ret;
     }
-  );
+
+    props.partials[options.args[0]] = options.fn;
+
+    return ret;
+  });
 }

lib/handlebars/exception.js

@@ -0,0 +1,68 @@
+const errorProps = [
+  'description',
+  'fileName',
+  'lineNumber',
+  'endLineNumber',
+  'message',
+  'name',
+  'number',
+  'stack'
+];
+
+function Exception(message, node) {
+  let loc = node && node.loc,
+    line,
+    endLineNumber,
+    column,
+    endColumn;
+
+  if (loc) {
+    line = loc.start.line;
+    endLineNumber = loc.end.line;
+    column = loc.start.column;
+    endColumn = loc.end.column;
+
+    message += ' - ' + line + ':' + column;
+  }
+
+  let tmp = Error.prototype.constructor.call(this, message);
+
+  // Unfortunately errors are not enumerable in Chrome (at least), so `for prop in tmp` doesn't work.
+  for (let idx = 0; idx < errorProps.length; idx++) {
+    this[errorProps[idx]] = tmp[errorProps[idx]];
+  }
+
+  /* istanbul ignore else */
+  if (Error.captureStackTrace) {
+    Error.captureStackTrace(this, Exception);
+  }
+
+  try {
+    if (loc) {
+      this.lineNumber = line;
+      this.endLineNumber = endLineNumber;
+
+      // Work around issue under safari where we can't directly set the column value
+      /* istanbul ignore next */
+      if (Object.defineProperty) {
+        Object.defineProperty(this, 'column', {
+          value: column,
+          enumerable: true
+        });
+        Object.defineProperty(this, 'endColumn', {
+          value: endColumn,
+          enumerable: true
+        });
+      } else {
+        this.column = column;
+        this.endColumn = endColumn;
+      }
+    }
+  } catch (nop) {
+    /* Ignore if the browser is very particular */
+  }
+}
+
+Exception.prototype = new Error();
+
+export default Exception;

lib/handlebars/helpers/block-helper-missing.js

@@ -1,7 +1,7 @@
-import { isArray } from '../utils';
+import { appendContextPath, createFrame, isArray } from '../utils';
 
-export default function (instance) {
+export default function(instance) {
-  instance.registerHelper('blockHelperMissing', function (context, options) {
+  instance.registerHelper('blockHelperMissing', function(context, options) {
     let inverse = options.inverse,
       fn = options.fn;
 
@@ -11,11 +11,24 @@ export default function (instance) {
       return inverse(this);
     } else if (isArray(context)) {
       if (context.length > 0) {
+        if (options.ids) {
+          options.ids = [options.name];
+        }
+
         return instance.helpers.each(context, options);
       } else {
         return inverse(this);
       }
     } else {
+      if (options.data && options.ids) {
+        let data = createFrame(options.data);
+        data.contextPath = appendContextPath(
+          options.data.contextPath,
+          options.name
+        );
+        options = { data: data };
+      }
+
       return fn(context, options);
     }
   });

lib/handlebars/helpers/each.js

@@ -1,8 +1,14 @@
-import { Exception } from '@handlebars/parser';
+import {
-import { createFrame, isArray, isFunction, isMap, isSet } from '../utils';
+  appendContextPath,
+  blockParams,
+  createFrame,
+  isArray,
+  isFunction
+} from '../utils';
+import Exception from '../exception';
 
-export default function (instance) {
+export default function(instance) {
-  instance.registerHelper('each', function (context, options) {
+  instance.registerHelper('each', function(context, options) {
     if (!options) {
       throw new Exception('Must pass iterator to #each');
     }
@@ -11,7 +17,13 @@ export default function (instance) {
       inverse = options.inverse,
       i = 0,
       ret = '',
-      data;
+      data,
+      contextPath;
+
+    if (options.data && options.ids) {
+      contextPath =
+        appendContextPath(options.data.contextPath, options.ids[0]) + '.';
+    }
 
     if (isFunction(context)) {
       context = context.call(this);
@@ -21,19 +33,26 @@ export default function (instance) {
       data = createFrame(options.data);
     }
 
-    function execIteration(field, value, index, last) {
+    function execIteration(field, index, last) {
       if (data) {
         data.key = field;
         data.index = index;
         data.first = index === 0;
         data.last = !!last;
+
+        if (contextPath) {
+          data.contextPath = contextPath + field;
+        }
       }
 
       ret =
         ret +
-        fn(value, {
+        fn(context[field], {
           data: data,
-          blockParams: [context[field], field],
+          blockParams: blockParams(
+            [context[field], field],
+            [contextPath + field, null]
+          )
         });
     }
 
@@ -41,19 +60,9 @@ export default function (instance) {
       if (isArray(context)) {
         for (let j = context.length; i < j; i++) {
           if (i in context) {
-            execIteration(i, context[i], i, i === context.length - 1);
+            execIteration(i, i, i === context.length - 1);
           }
         }
-      } else if (isMap(context)) {
-        const j = context.size;
-        for (const [key, value] of context) {
-          execIteration(key, value, i++, i === j);
-        }
-      } else if (isSet(context)) {
-        const j = context.size;
-        for (const value of context) {
-          execIteration(i, value, i++, i === j);
-        }
       } else if (typeof Symbol === 'function' && context[Symbol.iterator]) {
         const newContext = [];
         const iterator = context[Symbol.iterator]();
@@ -62,23 +71,23 @@ export default function (instance) {
         }
         context = newContext;
         for (let j = context.length; i < j; i++) {
-          execIteration(i, context[i], i, i === context.length - 1);
+          execIteration(i, i, i === context.length - 1);
         }
       } else {
         let priorKey;
 
-        Object.keys(context).forEach((key) => {
+        Object.keys(context).forEach(key => {
           // We're running the iterations one step out of sync so we can detect
           // the last iteration without have to scan the object twice and create
-          // an intermediate keys array.
+          // an itermediate keys array.
           if (priorKey !== undefined) {
-            execIteration(priorKey, context[priorKey], i - 1);
+            execIteration(priorKey, i - 1);
           }
           priorKey = key;
           i++;
         });
         if (priorKey !== undefined) {
-          execIteration(priorKey, context[priorKey], i - 1, true);
+          execIteration(priorKey, i - 1, true);
         }
       }
     }

lib/handlebars/helpers/helper-missing.js

@@ -1,7 +1,7 @@
-import { Exception } from '@handlebars/parser';
+import Exception from '../exception';
 
-export default function (instance) {
+export default function(instance) {
-  instance.registerHelper('helperMissing', function (/* [args, ]options */) {
+  instance.registerHelper('helperMissing', function(/* [args, ]options */) {
     if (arguments.length === 1) {
       // A missing field in a {{foo}} construct.
       return undefined;

lib/handlebars/helpers/if.js

@@ -1,8 +1,8 @@
-import { Exception } from '@handlebars/parser';
 import { isEmpty, isFunction } from '../utils';
+import Exception from '../exception';
 
-export default function (instance) {
+export default function(instance) {
-  instance.registerHelper('if', function (conditional, options) {
+  instance.registerHelper('if', function(conditional, options) {
     if (arguments.length != 2) {
       throw new Exception('#if requires exactly one argument');
     }
@@ -11,7 +11,7 @@ export default function (instance) {
     }
 
     // Default behavior is to render the positive path if the value is truthy and not empty.
-    // The `includeZero` option may be set to treat the conditional as purely not empty based on the
+    // The `includeZero` option may be set to treat the condtional as purely not empty based on the
     // behavior of isEmpty. Effectively this determines if 0 is handled by the positive path or negative.
     if ((!options.hash.includeZero && !conditional) || isEmpty(conditional)) {
       return options.inverse(this);
@@ -20,14 +20,14 @@ export default function (instance) {
     }
   });
 
-  instance.registerHelper('unless', function (conditional, options) {
+  instance.registerHelper('unless', function(conditional, options) {
     if (arguments.length != 2) {
       throw new Exception('#unless requires exactly one argument');
     }
     return instance.helpers['if'].call(this, conditional, {
       fn: options.inverse,
       inverse: options.fn,
-      hash: options.hash,
+      hash: options.hash
     });
   });
 }

lib/handlebars/helpers/log.js

@@ -1,5 +1,5 @@
-export default function (instance) {
+export default function(instance) {
-  instance.registerHelper('log', function (/* message, options */) {
+  instance.registerHelper('log', function(/* message, options */) {
     let args = [undefined],
       options = arguments[arguments.length - 1];
     for (let i = 0; i < arguments.length - 1; i++) {

lib/handlebars/helpers/lookup.js

@@ -1,5 +1,5 @@
-export default function (instance) {
+export default function(instance) {
-  instance.registerHelper('lookup', function (obj, field, options) {
+  instance.registerHelper('lookup', function(obj, field, options) {
     if (!obj) {
       // Note for 5.0: Change to "obj == null" in 5.0
       return obj;

lib/handlebars/helpers/with.js

@@ -1,8 +1,14 @@
-import { Exception } from '@handlebars/parser';
+import {
-import { isEmpty, isFunction } from '../utils';
+  appendContextPath,
+  blockParams,
+  createFrame,
+  isEmpty,
+  isFunction
+} from '../utils';
+import Exception from '../exception';
 
-export default function (instance) {
+export default function(instance) {
-  instance.registerHelper('with', function (context, options) {
+  instance.registerHelper('with', function(context, options) {
     if (arguments.length != 2) {
       throw new Exception('#with requires exactly one argument');
     }
@@ -14,10 +20,17 @@ export default function (instance) {
 
     if (!isEmpty(context)) {
       let data = options.data;
+      if (options.data && options.ids) {
+        data = createFrame(options.data);
+        data.contextPath = appendContextPath(
+          options.data.contextPath,
+          options.ids[0]
+        );
+      }
 
       return fn(context, {
         data: data,
-        blockParams: [context],
+        blockParams: blockParams([context], [data && data.contextPath])
       });
     } else {
       return options.inverse(this);

lib/handlebars/internal/proto-access.js

@@ -16,17 +16,18 @@ export function createProtoAccessControl(runtimeOptions) {
   methodWhiteList['__defineGetter__'] = false;
   methodWhiteList['__defineSetter__'] = false;
   methodWhiteList['__lookupGetter__'] = false;
+  methodWhiteList['__lookupSetter__'] = false;
   extend(methodWhiteList, runtimeOptions.allowedProtoMethods);
 
   return {
     properties: {
       whitelist: propertyWhiteList,
-      defaultValue: runtimeOptions.allowProtoPropertiesByDefault,
+      defaultValue: runtimeOptions.allowProtoPropertiesByDefault
     },
     methods: {
       whitelist: methodWhiteList,
-      defaultValue: runtimeOptions.allowProtoMethodsByDefault,
+      defaultValue: runtimeOptions.allowProtoMethodsByDefault
-    },
+    }
   };
 }
 
@@ -45,11 +46,11 @@ function checkWhiteList(protoAccessControlForType, propertyName) {
   if (protoAccessControlForType.defaultValue !== undefined) {
     return protoAccessControlForType.defaultValue;
   }
-  logUnexpectedPropertyAccessOnce(propertyName);
+  logUnexpecedPropertyAccessOnce(propertyName);
   return false;
 }
 
-function logUnexpectedPropertyAccessOnce(propertyName) {
+function logUnexpecedPropertyAccessOnce(propertyName) {
   if (loggedProperties[propertyName] !== true) {
     loggedProperties[propertyName] = true;
     logger.log(
@@ -62,7 +63,7 @@ function logUnexpectedPropertyAccessOnce(propertyName) {
 }
 
 export function resetLoggedProperties() {
-  Object.keys(loggedProperties).forEach((propertyName) => {
+  Object.keys(loggedProperties).forEach(propertyName => {
     delete loggedProperties[propertyName];
   });
 }

lib/handlebars/internal/wrapHelper.js

@@ -1,10 +1,10 @@
 export function wrapHelper(helper, transformOptionsFn) {
   if (typeof helper !== 'function') {
-    // This should not happen, but apparently it does in https://github.com/handlebars-lang/handlebars.js/issues/1639
+    // This should not happen, but apparently it does in https://github.com/wycats/handlebars.js/issues/1639
     // We try to make the wrapper least-invasive by not wrapping it, if the helper is not a function.
     return helper;
   }
-  let wrapper = function (/* dynamic arguments */) {
+  let wrapper = function(/* dynamic arguments */) {
     const options = arguments[arguments.length - 1];
     arguments[arguments.length - 1] = transformOptionsFn(options);
     return helper.apply(this, arguments);

lib/handlebars/logger.js

@@ -5,7 +5,7 @@ let logger = {
   level: 'info',
 
   // Maps a given level value to the `methodMap` indexes above.
-  lookupLevel: function (level) {
+  lookupLevel: function(level) {
     if (typeof level === 'string') {
       let levelMap = indexOf(logger.methodMap, level.toLowerCase());
       if (levelMap >= 0) {
@@ -19,7 +19,7 @@ let logger = {
   },
 
   // Can be overridden in the host environment
-  log: function (level, ...message) {
+  log: function(level, ...message) {
     level = logger.lookupLevel(level);
 
     if (
@@ -33,7 +33,7 @@ let logger = {
       }
       console[method](...message); // eslint-disable-line no-console
     }
-  },
+  }
 };
 
 export default logger;

lib/handlebars/no-conflict.js

@@ -1,8 +1,20 @@
-export default function (Handlebars) {
+/* global globalThis */
-  let $Handlebars = globalThis.Handlebars;
+export default function(Handlebars) {
+  /* istanbul ignore next */
+  // https://mathiasbynens.be/notes/globalthis
+  (function() {
+    if (typeof globalThis === 'object') return;
+    Object.prototype.__defineGetter__('__magic__', function() {
+      return this;
+    });
+    __magic__.globalThis = __magic__; // eslint-disable-line no-undef
+    delete Object.prototype.__magic__;
+  })();
 
-  /* v8 ignore next */
+  const $Handlebars = globalThis.Handlebars;
-  Handlebars.noConflict = function () {
+
+  /* istanbul ignore next */
+  Handlebars.noConflict = function() {
     if (globalThis.Handlebars === Handlebars) {
       globalThis.Handlebars = $Handlebars;
     }

lib/handlebars/runtime.js

@@ -1,16 +1,16 @@
-import { Exception } from '@handlebars/parser';
 import * as Utils from './utils';
+import Exception from './exception';
 import {
   COMPILER_REVISION,
   createFrame,
   LAST_COMPATIBLE_COMPILER_REVISION,
-  REVISION_CHANGES,
+  REVISION_CHANGES
 } from './base';
 import { moveHelperToHooks } from './helpers';
 import { wrapHelper } from './internal/wrapHelper';
 import {
   createProtoAccessControl,
-  resultIsAllowed,
+  resultIsAllowed
 } from './internal/proto-access';
 
 export function checkRevision(compilerInfo) {
@@ -47,7 +47,7 @@ export function checkRevision(compilerInfo) {
 }
 
 export function template(templateSpec, env) {
-  /* v8 ignore next */
+  /* istanbul ignore next */
   if (!env) {
     throw new Exception('No environment passed to template');
   }
@@ -68,6 +68,9 @@ export function template(templateSpec, env) {
   function invokePartialWrapper(partial, context, options) {
     if (options.hash) {
       context = Utils.extend({}, context, options.hash);
+      if (options.ids) {
+        options.ids[0] = true;
+      }
     }
     partial = env.VM.resolvePartial.call(this, partial, context, options);
 
@@ -108,19 +111,15 @@ export function template(templateSpec, env) {
 
   // Just add water
   let container = {
-    strict: function (obj, name, loc) {
+    strict: function(obj, name, loc) {
       if (!obj || !(name in obj)) {
         throw new Exception('"' + name + '" not defined in ' + obj, {
-          loc: loc,
+          loc: loc
         });
       }
       return container.lookupProperty(obj, name);
     },
-    lookupProperty: function (parent, propertyName) {
+    lookupProperty: function(parent, propertyName) {
-      if (Utils.isMap(parent)) {
-        return parent.get(propertyName);
-      }
-
       let result = parent[propertyName];
       if (result == null) {
         return result;
@@ -134,30 +133,30 @@ export function template(templateSpec, env) {
       }
       return undefined;
     },
-    lookup: function (depths, name) {
+    lookup: function(depths, name) {
       const len = depths.length;
       for (let i = 0; i < len; i++) {
         let result = depths[i] && container.lookupProperty(depths[i], name);
         if (result != null) {
-          return depths[i][name];
+          return result;
         }
       }
     },
-    lambda: function (current, context) {
+    lambda: function(current, context) {
       return typeof current === 'function' ? current.call(context) : current;
     },
 
     escapeExpression: Utils.escapeExpression,
     invokePartial: invokePartialWrapper,
 
-    fn: function (i) {
+    fn: function(i) {
       let ret = templateSpec[i];
       ret.decorator = templateSpec[i + '_d'];
       return ret;
     },
 
     programs: [],
-    program: function (i, data, declaredBlockParams, blockParams, depths) {
+    program: function(i, data, declaredBlockParams, blockParams, depths) {
       let programWrapper = this.programs[i],
         fn = this.fn(i);
       if (data || depths || blockParams || declaredBlockParams) {
@@ -176,13 +175,13 @@ export function template(templateSpec, env) {
       return programWrapper;
     },
 
-    data: function (value, depth) {
+    data: function(value, depth) {
       while (value && depth--) {
         value = value._parent;
       }
       return value;
     },
-    mergeIfNeeded: function (param, common) {
+    mergeIfNeeded: function(param, common) {
       let obj = param || common;
 
       if (param && common && param !== common) {
@@ -195,13 +194,13 @@ export function template(templateSpec, env) {
     nullContext: Object.seal({}),
 
     noop: env.VM.noop,
-    compilerInfo: templateSpec.compiler,
+    compilerInfo: templateSpec.compiler
   };
 
   function ret(context, options = {}) {
     let data = options.data;
 
-    _setup(options);
+    ret._setup(options);
     if (!options.partial && templateSpec.useData) {
       data = initData(context, data);
     }
@@ -246,7 +245,7 @@ export function template(templateSpec, env) {
 
   ret.isTop = true;
 
-  function _setup(options) {
+  ret._setup = function(options) {
     if (!options.partial) {
       let mergedHelpers = {};
       addHelpers(mergedHelpers, env.helpers, container);
@@ -283,8 +282,26 @@ export function template(templateSpec, env) {
       container.decorators = options.decorators;
       container.hooks = options.hooks;
     }
-  }
+  };
 
+  ret._child = function(i, data, blockParams, depths) {
+    if (templateSpec.useBlockParams && !blockParams) {
+      throw new Exception('must pass block params');
+    }
+    if (templateSpec.useDepths && !depths) {
+      throw new Exception('must pass parent depths');
+    }
+
+    return wrapProgram(
+      container,
+      i,
+      templateSpec[i],
+      data,
+      0,
+      blockParams,
+      depths
+    );
+  };
   return ret;
 }
 
@@ -332,22 +349,25 @@ export function wrapProgram(
 export function resolvePartial(partial, context, options) {
   if (!partial) {
     if (options.name === '@partial-block') {
-      partial = options.data['partial-block'];
+      partial = lookupOwnProperty(options.data, 'partial-block');
     } else {
-      partial = options.partials[options.name];
+      partial = lookupOwnProperty(options.partials, options.name);
     }
   } else if (!partial.call && !options.name) {
     // This is a dynamic partial that returned a string
     options.name = partial;
-    partial = options.partials[partial];
+    partial = lookupOwnProperty(options.partials, partial);
   }
   return partial;
 }
 
 export function invokePartial(partial, context, options) {
   // Use the current closure context to save the partial-block if this partial
-  const currentPartialBlock = options.data && options.data['partial-block'];
+  const currentPartialBlock = lookupOwnProperty(options.data, 'partial-block');
   options.partial = true;
+  if (options.ids) {
+    options.data.contextPath = options.ids[0] || options.data.contextPath;
+  }
 
   let partialBlock;
   if (options.fn && options.fn !== noop) {
@@ -374,9 +394,7 @@ export function invokePartial(partial, context, options) {
   }
 
   if (partial === undefined) {
-    throw new Exception(
+    throw new Exception('The partial ' + options.name + ' could not be found');
-      'The partial "' + options.name + '" could not be found'
-    );
   } else if (partial instanceof Function) {
     return partial(context, options);
   }
@@ -386,6 +404,12 @@ export function noop() {
   return '';
 }
 
+function lookupOwnProperty(obj, name) {
+  if (obj && Object.prototype.hasOwnProperty.call(obj, name)) {
+    return obj[name];
+  }
+}
+
 function initData(context, data) {
   if (!data || !('root' in data)) {
     data = data ? createFrame(data) : {};
@@ -413,7 +437,7 @@ function executeDecorators(fn, prog, container, depths, data, blockParams) {
 
 function addHelpers(mergedHelpers, helpers, container) {
   if (!helpers) return;
-  Object.keys(helpers).forEach((helperName) => {
+  Object.keys(helpers).forEach(helperName => {
     let helper = helpers[helperName];
     mergedHelpers[helperName] = passLookupPropertyOption(helper, container);
   });
@@ -421,7 +445,7 @@ function addHelpers(mergedHelpers, helpers, container) {
 
 function passLookupPropertyOption(helper, container) {
   const lookupProperty = container.lookupProperty;
-  return wrapHelper(helper, (options) => {
+  return wrapHelper(helper, options => {
     options.lookupProperty = lookupProperty;
     return options;
   });

lib/handlebars/safe-string.js

@@ -3,7 +3,7 @@ function SafeString(string) {
   this.string = string;
 }
 
-SafeString.prototype.toString = SafeString.prototype.toHTML = function () {
+SafeString.prototype.toString = SafeString.prototype.toHTML = function() {
   return '' + this.string;
 };
 

lib/handlebars/utils.js

@@ -5,7 +5,7 @@ const escape = {
   '"': '"',
   "'": ''',
   '`': '`',
-  '=': '=',
+  '=': '='
 };
 
 const badChars = /[&<>"'`=]/g,
@@ -30,23 +30,32 @@ export function extend(obj /* , ...source */) {
 export let toString = Object.prototype.toString;
 
 // Sourced from lodash
-// https://github.com/lodash/lodash/blob/4.17.21/LICENSE
+// https://github.com/bestiejs/lodash/blob/master/LICENSE.txt
-export function isFunction(value) {
+/* eslint-disable func-style */
+let isFunction = function(value) {
   return typeof value === 'function';
-}
+};
-
+// fallback for older versions of Chrome and Safari
-function testTag(name) {
+/* istanbul ignore next */
-  const tag = '[object ' + name + ']';
+if (isFunction(/x/)) {
-  return function (value) {
+  isFunction = function(value) {
-    return value && typeof value === 'object'
+    return (
-      ? toString.call(value) === tag
+      typeof value === 'function' &&
-      : false;
+      toString.call(value) === '[object Function]'
+    );
   };
 }
+export { isFunction };
+/* eslint-enable func-style */
 
-export const isArray = Array.isArray;
+/* istanbul ignore next */
-export const isMap = testTag('Map');
+export const isArray =
-export const isSet = testTag('Set');
+  Array.isArray ||
+  function(value) {
+    return value && typeof value === 'object'
+      ? toString.call(value) === '[object Array]'
+      : false;
+  };
 
 // Older IE versions do not directly support indexOf so we must implement our own, sadly.
 export function indexOf(array, value) {
@@ -96,3 +105,39 @@ export function createFrame(object) {
   frame._parent = object;
   return frame;
 }
+
+export function blockParams(params, ids) {
+  params.path = ids;
+  return params;
+}
+
+export function appendContextPath(contextPath, id) {
+  return (contextPath ? contextPath + '.' : '') + id;
+}
+
+/**
+ * Coerce an untrusted depth value to a safe non-negative integer.
+ * Returns `0` for any value that is not a finite, non-negative number.
+ *
+ * @param {unknown} depth - The depth value to sanitize.
+ * @returns {number} A non-negative integer.
+ */
+export function sanitizeDepth(depth) {
+  let number = Number(depth);
+  if (!Number.isFinite(number) || number < 0) {
+    return 0;
+  }
+  return Math.floor(number);
+}
+
+/**
+ * Return a sanitized copy of a PathExpression AST node's parts array.
+ * Coerces each element to a string, or returns an empty array if parts
+ * is not an array.
+ *
+ * @param {unknown} parts - The parts value to sanitize.
+ * @returns {string[]} A safe string array.
+ */
+export function sanitizeParts(parts) {
+  return Array.isArray(parts) ? parts.map(String) : [];
+}

lib/index.js

@@ -1,14 +1,15 @@
 // USAGE:
 // var handlebars = require('handlebars');
+/* eslint-env node */
 /* eslint-disable no-var */
 
 // var local = handlebars.create();
 
 var handlebars = require('../dist/cjs/handlebars')['default'];
 
-var parser = require('@handlebars/parser');
+var printer = require('../dist/cjs/handlebars/compiler/printer');
-handlebars.PrintVisitor = parser.PrintVisitor;
+handlebars.PrintVisitor = printer.PrintVisitor;
-handlebars.print = parser.print;
+handlebars.print = printer.print;
 
 module.exports = handlebars;
 
@@ -18,7 +19,7 @@ function extension(module, filename) {
   var templateString = fs.readFileSync(filename, 'utf8');
   module.exports = handlebars.compile(templateString);
 }
-/* v8 ignore next 4 */
+/* istanbul ignore else */
 if (typeof require !== 'undefined' && require.extensions) {
   require.extensions['.handlebars'] = extension;
   require.extensions['.hbs'] = extension;

lib/precompiler.js

@@ -1,16 +1,17 @@
+/* eslint-env node */
 /* eslint-disable no-console */
 import Async from 'neo-async';
 import fs from 'fs';
-import Handlebars from './handlebars';
+import * as Handlebars from './handlebars';
 import { basename } from 'path';
 import { SourceMapConsumer, SourceNode } from 'source-map';
 
-module.exports.loadTemplates = function (opts, callback) {
+module.exports.loadTemplates = function(opts, callback) {
-  loadStrings(opts, function (err, strings) {
+  loadStrings(opts, function(err, strings) {
     if (err) {
       callback(err);
     } else {
-      loadFiles(opts, function (err, files) {
+      loadFiles(opts, function(err, files) {
         if (err) {
           callback(err);
         } else {
@@ -36,7 +37,7 @@ function loadStrings(opts, callback) {
 
   Async.map(
     strings,
-    function (string, callback) {
+    function(string, callback) {
       if (string !== '-') {
         callback(undefined, string);
       } else {
@@ -44,19 +45,19 @@ function loadStrings(opts, callback) {
         let buffer = '';
         process.stdin.setEncoding('utf8');
 
-        process.stdin.on('data', function (chunk) {
+        process.stdin.on('data', function(chunk) {
           buffer += chunk;
         });
-        process.stdin.on('end', function () {
+        process.stdin.on('end', function() {
           callback(undefined, buffer);
         });
       }
     },
-    function (err, strings) {
+    function(err, strings) {
       strings = strings.map((string, index) => ({
         name: names[index],
         path: names[index],
-        source: string,
+        source: string
       }));
       callback(err, strings);
     }
@@ -67,23 +68,20 @@ function loadFiles(opts, callback) {
   // Build file extension pattern
   let extension = (opts.extension || 'handlebars').replace(
     /[\\^$*+?.():=!|{}\-[\]]/g,
-    function (arg) {
+    function(arg) {
       return '\\' + arg;
     }
   );
   extension = new RegExp('\\.' + extension + '$');
 
   let ret = [],
-    queue = (opts.files || []).map((template) => ({
+    queue = (opts.files || []).map(template => ({ template, root: opts.root }));
-      template,
-      root: opts.root,
-    }));
   Async.whilst(
     () => queue.length,
-    function (callback) {
+    function(callback) {
       let { template: path, root } = queue.shift();
 
-      fs.stat(path, function (err, stat) {
+      fs.stat(path, function(err, stat) {
         if (err) {
           return callback(
             new Handlebars.Exception(`Unable to open template file "${path}"`)
@@ -93,12 +91,12 @@ function loadFiles(opts, callback) {
         if (stat.isDirectory()) {
           opts.hasDirectory = true;
 
-          fs.readdir(path, function (err, children) {
+          fs.readdir(path, function(err, children) {
-            /* v8 ignore next -- Race condition that being too lazy to test */
+            /* istanbul ignore next : Race condition that being too lazy to test */
             if (err) {
               return callback(err);
             }
-            children.forEach(function (file) {
+            children.forEach(function(file) {
               let childPath = path + '/' + file;
 
               if (
@@ -112,8 +110,8 @@ function loadFiles(opts, callback) {
             callback();
           });
         } else {
-          fs.readFile(path, 'utf8', function (err, data) {
+          fs.readFile(path, 'utf8', function(err, data) {
-            /* v8 ignore next -- Race condition that being too lazy to test */
+            /* istanbul ignore next : Race condition that being too lazy to test */
             if (err) {
               return callback(err);
             }
@@ -134,7 +132,7 @@ function loadFiles(opts, callback) {
             ret.push({
               path: path,
               name: name,
-              source: data,
+              source: data
             });
 
             callback();
@@ -142,7 +140,7 @@ function loadFiles(opts, callback) {
         }
       });
     },
-    function (err) {
+    function(err) {
       if (err) {
         callback(err);
       } else {
@@ -152,7 +150,7 @@ function loadFiles(opts, callback) {
   );
 }
 
-module.exports.cli = async function (opts) {
+module.exports.cli = function(opts) {
   if (opts.version) {
     console.log(Handlebars.VERSION);
     return;
@@ -198,16 +196,24 @@ module.exports.cli = async function (opts) {
 
   const objectName = opts.partial ? 'Handlebars.partials' : 'templates';
 
+  if (opts.namespace && !isValidNamespace(opts.namespace)) {
+    throw new Handlebars.Exception('Invalid namespace format');
+  }
+
   let output = new SourceNode();
   if (!opts.simple) {
     if (opts.amd) {
+      const runtimeModulePath =
+        (opts.handlebarPath || '') + 'handlebars.runtime';
       output.add(
-        "define(['" +
+        'define([' +
-          opts.handlebarPath +
+          quoteForJavaScript(runtimeModulePath) +
-          'handlebars.runtime\'], function(Handlebars) {\n  Handlebars = Handlebars["default"];'
+          '], function(Handlebars) {\n  Handlebars = Handlebars["default"];'
       );
     } else if (opts.commonjs) {
-      output.add('var Handlebars = require("' + opts.commonjs + '");');
+      output.add(
+        'var Handlebars = require(' + quoteForJavaScript(opts.commonjs) + ');'
+      );
     } else {
       output.add('(function() {\n');
     }
@@ -221,10 +227,10 @@ module.exports.cli = async function (opts) {
     output.add('{};\n');
   }
 
-  for (const template of opts.templates) {
+  opts.templates.forEach(function(template) {
     let options = {
       knownHelpers: known,
-      knownHelpersOnly: opts.o,
+      knownHelpersOnly: opts.o
     };
 
     if (opts.map) {
@@ -238,12 +244,11 @@ module.exports.cli = async function (opts) {
 
     // If we are generating a source map, we have to reconstruct the SourceNode object
     if (opts.map) {
-      let consumer = await new SourceMapConsumer(precompiled.map);
+      let consumer = new SourceMapConsumer(precompiled.map);
       precompiled = SourceNode.fromStringWithSourceMap(
         precompiled.code,
         consumer
       );
-      consumer.destroy();
     }
 
     if (opts.simple) {
@@ -258,14 +263,14 @@ module.exports.cli = async function (opts) {
       }
       output.add([
         objectName,
-        "['",
+        '[',
-        template.name,
+        quoteForJavaScript(template.name),
-        "'] = template(",
+        '] = template(',
         precompiled,
-        ');\n',
+        ');\n'
       ]);
     }
-  }
+  });
 
   // Output the content
   if (!opts.simple) {
@@ -280,7 +285,9 @@ module.exports.cli = async function (opts) {
   }
 
   if (opts.map) {
-    output.add('\n//# sourceMappingURL=' + opts.map + '\n');
+    output.add(
+      '\n//# sourceMappingURL=' + sanitizeSourceMapComment(opts.map) + '\n'
+    );
   }
 
   output = output.toStringWithSourceMap();
@@ -310,6 +317,33 @@ function arrayCast(value) {
   return value;
 }
 
+/*
+ * Safely quotes a value for embedding in generated JavaScript strings
+ *
+ * Uses JSON.stringify which handles all special characters.
+ */
+function quoteForJavaScript(value) {
+  return JSON.stringify(String(value));
+}
+
+/**
+ * Validates that a namespace is a legitimate dotted JavaScript identifier
+ * (e.g. "App.templates") to prevent arbitrary code injection
+ */
+function isValidNamespace(namespace) {
+  return /^[A-Za-z_$][A-Za-z0-9_$]*(\.[A-Za-z_$][A-Za-z0-9_$]*)*$/.test(
+    namespace
+  );
+}
+
+/**
+ * Strips line terminators from source map URLs to prevent injection of new
+ * JavaScript lines via the sourceMappingURL comment
+ */
+function sanitizeSourceMapComment(value) {
+  return String(value).replace(/[\r\n\u2028\u2029]/g, '');
+}
+
 /**
  * Run uglify to minify the compiled template, if uglify exists in the dependencies.
  *
@@ -338,7 +372,7 @@ function minify(output, sourceMapFile) {
   return require('uglify-js').minify(output.code, {
     sourceMap: {
       content: output.map,
-      url: sourceMapFile,
+      url: sourceMapFile
-    },
+    }
   });
 }

nyc.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+  'check-coverage': true,
+  branches: 100,
+  lines: 100,
+  functions: 100,
+  statements: 100,
+  exclude: ['**/spec/**', '**/handlebars/compiler/parser.js'],
+  reporter: 'html'
+};

package.json

@@ -1,26 +1,114 @@
 {
   "name": "handlebars",
-  "version": "5.0.0-alpha.1",
+  "barename": "handlebars",
+  "version": "4.7.9",
   "description": "Handlebars provides the power necessary to let you build semantic templates effectively with no frustration",
+  "homepage": "https://handlebarsjs.com/",
   "keywords": [
     "handlebars",
-    "html",
     "mustache",
-    "template"
+    "template",
+    "html"
   ],
-  "homepage": "https://handlebarsjs.com/",
-  "license": "MIT",
-  "author": "Yehuda Katz",
   "repository": {
     "type": "git",
     "url": "https://github.com/handlebars-lang/handlebars.js.git"
   },
+  "author": "Yehuda Katz",
+  "license": "MIT",
+  "readmeFilename": "README.md",
+  "engines": {
+    "node": ">=0.4.7"
+  },
+  "dependencies": {
+    "minimist": "^1.2.5",
+    "neo-async": "^2.6.2",
+    "source-map": "^0.6.1",
+    "wordwrap": "^1.0.0"
+  },
+  "optionalDependencies": {
+    "uglify-js": "^3.1.4"
+  },
+  "devDependencies": {
+    "@playwright/test": "1.44.1",
+    "aws-sdk": "^2.1.49",
+    "babel-loader": "^5.0.0",
+    "babel-runtime": "^5.1.10",
+    "benchmark": "~1.0",
+    "chai": "^4.2.0",
+    "chai-diff": "^1.0.1",
+    "concurrently": "^5.0.0",
+    "dirty-chai": "^2.0.1",
+    "dustjs-linkedin": "^2.0.2",
+    "eco": "~1.1.0-rc-3",
+    "eslint": "^6.7.2",
+    "eslint-config-prettier": "^6.7.0",
+    "eslint-plugin-compat": "^3.13.0",
+    "eslint-plugin-es5": "^1.4.1",
+    "fs-extra": "^8.1.0",
+    "grunt": "1.5.3",
+    "grunt-babel": "^5.0.0",
+    "grunt-cli": "^1",
+    "grunt-contrib-clean": "^1",
+    "grunt-contrib-concat": "^1",
+    "grunt-contrib-connect": "^1",
+    "grunt-contrib-copy": "^1",
+    "grunt-contrib-requirejs": "^1",
+    "grunt-contrib-uglify": "^1",
+    "grunt-contrib-watch": "^1.1.0",
+    "grunt-shell": "^4.0.0",
+    "grunt-webpack": "^1.0.8",
+    "husky": "^3.1.0",
+    "jison": "~0.3.0",
+    "lint-staged": "^9.5.0",
+    "mocha": "^5",
+    "mock-stdin": "^0.3.0",
+    "mustache": "^2.1.3",
+    "nyc": "^14.1.1",
+    "prettier": "^1.19.1",
+    "semver": "^5.0.1",
+    "sinon": "^7.5.0",
+    "typescript": "^3.4.3",
+    "underscore": "^1.5.1",
+    "webpack": "^1.12.6",
+    "webpack-dev-server": "^1.12.1"
+  },
+  "main": "lib/index.js",
+  "types": "types/index.d.ts",
+  "browser": "./dist/cjs/handlebars.js",
   "bin": {
-    "handlebars": "bin/handlebars.mjs"
+    "handlebars": "bin/handlebars"
+  },
+  "scripts": {
+    "build": "grunt build",
+    "release": "npm run build && grunt release",
+    "format": "prettier --write '**/*.js' && eslint --fix .",
+    "lint": "npm run lint:eslint && npm run lint:prettier && npm run lint:types",
+    "lint:eslint": "eslint --max-warnings 0 .",
+    "lint:prettier": "prettier --check '**/*.js'",
+    "lint:types": "tsc --noEmit --project types",
+    "test": "npm run test:mocha",
+    "test:mocha": "grunt build && grunt test",
+    "test:browser": "playwright test --config tests/browser/playwright.config.js tests/browser/spec.js",
+    "test:integration": "grunt integration-tests",
+    "test:serve": "grunt connect:server:keepalive",
+    "extensive-tests-and-publish-to-aws": "npx mocha tasks/tests/ && grunt --stack extensive-tests-and-publish-to-aws",
+    "--- combined tasks ---": "",
+    "check-before-pull-request": "concurrently --kill-others-on-fail npm:lint npm:test"
+  },
+  "jspm": {
+    "main": "handlebars",
+    "directories": {
+      "lib": "dist/amd"
+    },
+    "buildConfig": {
+      "minify": true
+    }
   },
   "files": [
     "bin",
     "dist/*.js",
+    "dist/amd/**/*.js",
     "dist/cjs/**/*.js",
     "lib",
     "release-notes.md",
@@ -28,102 +116,19 @@
     "types/*.d.ts",
     "runtime.d.ts"
   ],
-  "main": "lib/index.js",
-  "browser": "./dist/cjs/handlebars.js",
-  "types": "types/index.d.ts",
-  "scripts": {
-    "clean": "node -e \"require('fs').rmSync('dist',{recursive:true,force:true});require('fs').rmSync('tmp',{recursive:true,force:true})\"",
-    "build:cjs": "swc lib --out-dir dist/cjs --strip-leading-paths --ignore \"**/index.js\"",
-    "build:bundles": "rspack build",
-    "build": "npm run clean && npm run build:cjs && npm run build:bundles",
-    "release": "npm run build",
-    "publish:aws": "npm run build && npm run test:tasks && node tasks/publish-to-aws.js",
-    "format": "oxfmt --write . && oxlint --fix .",
-    "lint": "npm run lint:oxlint && npm run lint:format && npm run lint:types && npm run lint:compat",
-    "lint:oxlint": "oxlint --max-warnings 0 .",
-    "lint:format": "oxfmt --check .",
-    "lint:types": "tstyche",
-    "lint:compat": "eslint",
-    "test": "npm run build && vitest run --project node --project tasks --project rspack --coverage",
-    "test:browser": "vitest run --project browser",
-    "test:unit": "vitest run --project node",
-    "test:tasks": "vitest run --project tasks",
-    "test:publish": "npm run build && vitest run --project publish",
-    "test:browser-smoke": "playwright test --config tests/browser/playwright.config.js",
-    "test:serve": "npx serve -l 9999 .",
-    "test:integration": "npm run build && ./tests/integration/run-integration-tests.sh",
-    "bench": "node tests/bench/perf.mjs",
-    "bench:compare": "node tests/bench/compare.mjs",
-    "bench:size": "node tests/bench/size.mjs",
-    "--- combined tasks ---": "",
-    "check-before-pull-request": "concurrently --kill-others-on-fail npm:lint npm:test"
-  },
-  "dependencies": {
-    "@handlebars/parser": "^2.1.0",
-    "neo-async": "^2.6.2",
-    "source-map": "^0.7.6",
-    "yargs": "^18.0.0"
-  },
-  "devDependencies": {
-    "@aws-sdk/client-s3": "^3.1011.0",
-    "@playwright/test": "^1.58.2",
-    "@rspack/cli": "^1.7.8",
-    "@rspack/core": "^1.7.8",
-    "@swc/cli": "^0.8.0",
-    "@swc/core": "^1.15.18",
-    "@vitest/browser": "^4.0.18",
-    "@vitest/browser-playwright": "^4.0.18",
-    "@vitest/coverage-v8": "^4.0.18",
-    "cli-testlab": "^6.0.0",
-    "concurrently": "^5.0.0",
-    "eslint": "^10.0.3",
-    "eslint-plugin-compat": "^7.0.1",
-    "fs-extra": "^8.1.0",
-    "husky": "^3.1.0",
-    "lint-staged": "^16.3.2",
-    "mock-stdin": "^0.3.0",
-    "oxfmt": "^0.36.0",
-    "oxlint": "^1.51.0",
-    "semver": "^5.0.1",
-    "tinybench": "^6.0.0",
-    "tstyche": "^6.2.0",
-    "typescript": "^5.9.3",
-    "uglify-js": "^3.19.3",
-    "vitest": "^4.0.18"
-  },
-  "peerDependencies": {
-    "uglify-js": "^3.19.3"
-  },
   "husky": {
     "hooks": {
       "pre-commit": "lint-staged"
     }
   },
   "lint-staged": {
-    "*.{js,css,json,md}": [
+    "*.{js,css,json}": [
-      "oxfmt --write"
+      "prettier --write",
+      "git add"
     ],
     "*.js": [
-      "oxlint --fix"
+      "eslint --fix",
+      "git add"
     ]
-  },
-  "browserslist": [
-    "last 2 versions",
-    "Firefox ESR",
-    "not dead",
-    "not IE 11",
-    "maintained node versions"
-  ],
-  "engines": {
-    "node": ">=20"
-  },
-  "jspm": {
-    "main": "handlebars",
-    "directories": {
-      "lib": "dist/cjs"
-    },
-    "buildConfig": {
-      "minify": true
-    }
   }
 }

prettier.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+  tabWidth: 2,
+  semi: true,
+  singleQuote: true
+};

rspack.config.js

@@ -1,88 +0,0 @@
-const { rspack } = require('@rspack/core');
-const path = require('path');
-const fs = require('fs');
-
-const pkg = require('./package.json');
-const license = fs.readFileSync(path.resolve(__dirname, 'LICENSE'), 'utf8');
-const banner = `/*!
-
- @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt Expat
- ${pkg.name} v${pkg.version}
-
-${license}
-*/`;
-
-function createConfig(entry, filename, minimize) {
-  const plugins = [];
-
-  if (!minimize) {
-    // For non-minified builds, use BannerPlugin to add the license header
-    plugins.push(new rspack.BannerPlugin({ banner, raw: true }));
-  }
-
-  return {
-    mode: minimize ? 'production' : 'none',
-    context: __dirname,
-    entry,
-    output: {
-      path: path.resolve(__dirname, 'dist'),
-      filename,
-      library: {
-        name: 'Handlebars',
-        type: 'umd',
-        export: 'default',
-      },
-      globalObject: 'this',
-      clean: false,
-    },
-    module: {
-      rules: [
-        {
-          test: /\.js$/,
-          exclude: /node_modules/,
-          use: {
-            loader: 'builtin:swc-loader',
-            options: {
-              jsc: {
-                parser: { syntax: 'ecmascript' },
-              },
-            },
-          },
-        },
-      ],
-    },
-    optimization: {
-      minimize,
-      minimizer: minimize
-        ? [
-            new rspack.SwcJsMinimizerRspackPlugin({
-              extractComments: false,
-              minimizerOptions: {
-                compress: { passes: 2 },
-                mangle: true,
-                format: {
-                  comments: false,
-                  // Prepend the license banner in the minified output
-                  preamble: banner,
-                },
-              },
-            }),
-          ]
-        : [],
-    },
-    plugins,
-    target: ['web', 'browserslist'],
-    devtool: false,
-  };
-}
-
-module.exports = [
-  createConfig('./lib/handlebars.js', 'handlebars.js', false),
-  createConfig('./lib/handlebars.runtime.js', 'handlebars.runtime.js', false),
-  createConfig('./lib/handlebars.js', 'handlebars.min.js', true),
-  createConfig(
-    './lib/handlebars.runtime.js',
-    'handlebars.runtime.min.js',
-    true
-  ),
-];

runtime.d.ts

@@ -1,3 +1,5 @@
-import Handlebars = require('handlebars');
+import Handlebars = require('handlebars')
 
-declare module 'handlebars/runtime' {}
+declare module "handlebars/runtime" {
+   
+}

spec/.eslintrc

@@ -0,0 +1,47 @@
+{
+  "extends": [
+    "../.eslintrc.js",
+    "plugin:es5/no-es2015",
+    "prettier"
+  ],
+  "plugins": [
+    "es5"
+  ],
+  "globals": {
+    "CompilerContext": true,
+    "Handlebars": true,
+    "handlebarsEnv": true,
+    "shouldCompileTo": true,
+    "shouldCompileToWithPartials": true,
+    "shouldThrow": true,
+    "expectTemplate": true,
+    "compileWithPartials": true,
+    "console": true,
+    "require": true,
+    "suite": true,
+    "equal": true,
+    "equals": true,
+    "test": true,
+    "testBoth": true,
+    "raises": true,
+    "deepEqual": true,
+    "start": true,
+    "stop": true,
+    "ok": true,
+    "sinon": true,
+    "strictEqual": true,
+    "define": true,
+    "expect": true,
+    "chai": true
+  },
+  "env": {
+    "mocha": true
+  },
+  "rules": {
+    // Disabling for tests, for now.
+    "no-path-concat": "off",
+
+    "no-var": "off",
+    "dot-notation": "off"
+  }
+}

spec/amd-runtime.html

@@ -0,0 +1,108 @@
+<html>
+  <head>
+    <title>Mocha</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+    <link rel="stylesheet" href="/node_modules/mocha/mocha.css" />
+    <style>
+      .headless .suite > h1,
+      .headless .test.pass {
+        display: none;
+      }
+    </style>
+
+    <script>
+      // Show only errors in "headless", non-interactive mode.
+      if (/headless=true/.test(location.href)) {
+        document.documentElement.className = 'headless';
+      }
+    </script>
+    <script src="/node_modules/sinon/pkg/sinon.js"></script>
+    <script src="/node_modules/chai/chai.js"></script>
+    <script src="/node_modules/dirty-chai/lib/dirty-chai.js"></script>
+    <script src="/node_modules/mocha/mocha.js"></script>
+    <script>
+      window.expect = chai.expect;
+      mocha.setup('bdd');
+    </script>
+    <script src="/spec/vendor/json2.js"></script>
+    <script src="/spec/vendor/require.js"></script>
+
+    <script src="/spec/env/common.js"></script>
+    <script>
+      var requireFailure;
+
+      requirejs.config({
+        paths: {
+          'handlebars.runtime': '/dist/handlebars.runtime.amd'
+        }
+      });
+      requirejs.onError = function (err) {
+        requireFailure = err;
+      };
+    </script>
+    <script>
+      onload = function(){
+        require(['handlebars.runtime'], function(Handlebars) {
+          describe('runtime', function() {
+            it('should load', function() {
+              equal(!!Handlebars['default'].template, true);
+              equal(!!Handlebars['default'].VERSION, true);
+            });
+          });
+
+          mocha.globals(['mochaResults'])
+          // The test harness leaks under FF. We should have decent global leak coverage from other tests
+          if (!navigator.userAgent.match(/Firefox\/([\d.]+)/)) {
+            mocha.checkLeaks();
+          }
+          var runner = mocha.run();
+
+          // Reporting to test-runner
+          var failedTests = [];
+          runner.on('end', function(){
+            window.mochaResults = runner.stats;
+            window.mochaResults.reports = failedTests;
+          });
+
+          runner.on('fail', logFailure);
+
+          // Inject any require initilizer failures into the first test so they are properly
+          // reported.
+          if (requireFailure) {
+            runner.on('hook end', function(hook){
+              if (requireFailure) {
+                runner.uncaught(requireFailure);
+                requireFailure = undefined;
+              }
+            });
+          }
+
+          function logFailure(test, err){
+
+            var flattenTitles = function(test){
+              var titles = [];
+              while (test.parent.title){
+                titles.push(test.parent.title);
+                test = test.parent;
+              }
+              return titles.reverse();
+            };
+
+            failedTests.push({
+              name: test.title,
+              result: false,
+              message: err.message,
+              stack: err.stack,
+              titles: flattenTitles(test)
+            });
+          }
+        });
+      };
+    </script>
+  </head>
+  <body>
+    <div id="mocha"></div>
+  </body>
+</html>

spec/amd.html

@@ -0,0 +1,128 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Mocha</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+    <link rel="stylesheet" href="/node_modules/mocha/mocha.css" />
+    <style>
+      .headless .suite > h1,
+      .headless .test.pass {
+        display: none;
+      }
+    </style>
+
+    <script>
+      // Show only errors in "headless", non-interactive mode.
+      if (/headless=true/.test(location.href)) {
+        document.documentElement.className = 'headless';
+      }
+    </script>
+    <script src="/node_modules/sinon/pkg/sinon.js"></script>
+    <script src="/node_modules/chai/chai.js"></script>
+    <script src="/node_modules/dirty-chai/lib/dirty-chai.js"></script>
+    <script src="/node_modules/mocha/mocha.js"></script>
+    <script>
+      window.expect = chai.expect;
+      mocha.setup('bdd');
+    </script>
+    <script src="/spec/vendor/json2.js"></script>
+    <script src="/spec/vendor/require.js"></script>
+
+    <script src="/spec/env/common.js"></script>
+    <script>
+      var requireFailure;
+
+      requirejs.config({
+        paths: {
+          handlebars: '/dist/handlebars.amd',
+          tests: '/tmp/tests'
+        }
+      });
+      requirejs.onError = function (err) {
+        requireFailure = err;
+      };
+
+      var CompilerContext = {
+        compile: function(template, options) {
+          var templateSpec = handlebarsEnv.precompile(template, options);
+          return handlebarsEnv.template(safeEval(templateSpec));
+        },
+        compileWithPartial: function(template, options) {
+          return handlebarsEnv.compile(template, options);
+        }
+      };
+
+      function safeEval(templateSpec) {
+        try {
+          var ret;
+          eval('ret = ' + templateSpec);
+          return ret;
+        } catch (err) {
+          console.error(templateSpec);
+          throw err;
+        }
+      }
+    </script>
+    <script>
+      onload = function(){
+
+        require(['handlebars'], function(Handlebars) {
+          window.Handlebars = Handlebars['default'];
+
+          require(['tests'], function(Handlebars) {
+            mocha.globals(['mochaResults'])
+            // The test harness leaks under FF. We should have decent global leak coverage from other tests
+            if (!navigator.userAgent.match(/Firefox\/([\d.]+)/)) {
+              mocha.checkLeaks();
+            }
+            var runner = mocha.run();
+
+            // Reporting to test-runner
+            var failedTests = [];
+            runner.on('end', function(){
+              window.mochaResults = runner.stats;
+              window.mochaResults.reports = failedTests;
+            });
+
+            runner.on('fail', logFailure);
+
+            // Inject any require initilizer failures into the first test so they are properly
+            // reported.
+            if (requireFailure) {
+              runner.on('hook end', function(hook){
+                if (requireFailure) {
+                  runner.uncaught(requireFailure);
+                  requireFailure = undefined;
+                }
+              });
+            }
+
+            function logFailure(test, err){
+              function flattenTitles(test){
+                var titles = [];
+                while (test.parent.title){
+                  titles.push(test.parent.title);
+                  test = test.parent;
+                }
+                return titles.reverse();
+              }
+
+              failedTests.push({
+                name: test.title,
+                result: false,
+                message: err.message,
+                stack: err.stack,
+                titles: flattenTitles(test)
+              });
+            }
+          });
+        });
+      };
+    </script>
+  </head>
+  <body>
+    <div id="mocha"></div>
+  </body>
+</html>

spec/ast.js

@@ -1,174 +1,178 @@
-describe('ast', function () {
+describe('ast', function() {
   if (!Handlebars.AST) {
     return;
   }
 
   var AST = Handlebars.AST;
 
-  describe('BlockStatement', function () {
+  describe('BlockStatement', function() {
-    it('should throw on mustache mismatch', function () {
+    it('should throw on mustache mismatch', function() {
-      expect(function () {
+      shouldThrow(
-        handlebarsEnv.parse('\n  {{#foo}}{{/bar}}');
+        function() {
-      }).toThrow("foo doesn't match bar - 2:5");
+          handlebarsEnv.parse('\n  {{#foo}}{{/bar}}');
+        },
+        Handlebars.Exception,
+        "foo doesn't match bar - 2:5"
+      );
     });
   });
 
-  describe('helpers', function () {
+  describe('helpers', function() {
-    describe('#helperExpression', function () {
+    describe('#helperExpression', function() {
-      it('should handle mustache statements', function () {
+      it('should handle mustache statements', function() {
-        expect(
+        equals(
           AST.helpers.helperExpression({
             type: 'MustacheStatement',
             params: [],
-            hash: undefined,
+            hash: undefined
-          })
+          }),
-        ).toBe(false);
+          false
-        expect(
+        );
+        equals(
           AST.helpers.helperExpression({
             type: 'MustacheStatement',
             params: [1],
-            hash: undefined,
+            hash: undefined
-          })
+          }),
-        ).toBe(true);
+          true
-        expect(
+        );
+        equals(
           AST.helpers.helperExpression({
             type: 'MustacheStatement',
             params: [],
-            hash: {},
+            hash: {}
-          })
+          }),
-        ).toBe(true);
-      });
-      it('should handle block statements', function () {
-        expect(
-          AST.helpers.helperExpression({
-            type: 'BlockStatement',
-            params: [],
-            hash: undefined,
-          })
-        ).toBe(false);
-        expect(
-          AST.helpers.helperExpression({
-            type: 'BlockStatement',
-            params: [1],
-            hash: undefined,
-          })
-        ).toBe(true);
-        expect(
-          AST.helpers.helperExpression({
-            type: 'BlockStatement',
-            params: [],
-            hash: {},
-          })
-        ).toBe(true);
-      });
-      it('should handle subexpressions', function () {
-        expect(AST.helpers.helperExpression({ type: 'SubExpression' })).toBe(
           true
         );
       });
-      it('should work with non-helper nodes', function () {
+      it('should handle block statements', function() {
-        expect(AST.helpers.helperExpression({ type: 'Program' })).toBe(false);
+        equals(
+          AST.helpers.helperExpression({
+            type: 'BlockStatement',
+            params: [],
+            hash: undefined
+          }),
+          false
+        );
+        equals(
+          AST.helpers.helperExpression({
+            type: 'BlockStatement',
+            params: [1],
+            hash: undefined
+          }),
+          true
+        );
+        equals(
+          AST.helpers.helperExpression({
+            type: 'BlockStatement',
+            params: [],
+            hash: {}
+          }),
+          true
+        );
+      });
+      it('should handle subexpressions', function() {
+        equals(AST.helpers.helperExpression({ type: 'SubExpression' }), true);
+      });
+      it('should work with non-helper nodes', function() {
+        equals(AST.helpers.helperExpression({ type: 'Program' }), false);
 
-        expect(AST.helpers.helperExpression({ type: 'PartialStatement' })).toBe(
+        equals(
+          AST.helpers.helperExpression({ type: 'PartialStatement' }),
           false
         );
-        expect(AST.helpers.helperExpression({ type: 'ContentStatement' })).toBe(
+        equals(
+          AST.helpers.helperExpression({ type: 'ContentStatement' }),
           false
         );
-        expect(AST.helpers.helperExpression({ type: 'CommentStatement' })).toBe(
+        equals(
+          AST.helpers.helperExpression({ type: 'CommentStatement' }),
           false
         );
 
-        expect(AST.helpers.helperExpression({ type: 'PathExpression' })).toBe(
+        equals(AST.helpers.helperExpression({ type: 'PathExpression' }), false);
-          false
-        );
 
-        expect(AST.helpers.helperExpression({ type: 'StringLiteral' })).toBe(
+        equals(AST.helpers.helperExpression({ type: 'StringLiteral' }), false);
-          false
+        equals(AST.helpers.helperExpression({ type: 'NumberLiteral' }), false);
-        );
+        equals(AST.helpers.helperExpression({ type: 'BooleanLiteral' }), false);
-        expect(AST.helpers.helperExpression({ type: 'NumberLiteral' })).toBe(
+        equals(
-          false
+          AST.helpers.helperExpression({ type: 'UndefinedLiteral' }),
-        );
-        expect(AST.helpers.helperExpression({ type: 'BooleanLiteral' })).toBe(
-          false
-        );
-        expect(AST.helpers.helperExpression({ type: 'UndefinedLiteral' })).toBe(
-          false
-        );
-        expect(AST.helpers.helperExpression({ type: 'NullLiteral' })).toBe(
           false
         );
+        equals(AST.helpers.helperExpression({ type: 'NullLiteral' }), false);
 
-        expect(AST.helpers.helperExpression({ type: 'Hash' })).toBe(false);
+        equals(AST.helpers.helperExpression({ type: 'Hash' }), false);
-        expect(AST.helpers.helperExpression({ type: 'HashPair' })).toBe(false);
+        equals(AST.helpers.helperExpression({ type: 'HashPair' }), false);
       });
     });
   });
 
-  describe('Line Numbers', function () {
+  describe('Line Numbers', function() {
     var ast, body;
 
     function testColumns(node, firstLine, lastLine, firstColumn, lastColumn) {
-      expect(node.loc.start.line).toBe(firstLine);
+      equals(node.loc.start.line, firstLine);
-      expect(node.loc.start.column).toBe(firstColumn);
+      equals(node.loc.start.column, firstColumn);
-      expect(node.loc.end.line).toBe(lastLine);
+      equals(node.loc.end.line, lastLine);
-      expect(node.loc.end.column).toBe(lastColumn);
+      equals(node.loc.end.column, lastColumn);
     }
 
+    /* eslint-disable no-multi-spaces */
     ast = Handlebars.parse(
       'line 1 {{line1Token}}\n' + // 1
-        ' line 2 {{line2token}}\n' + // 2
+      ' line 2 {{line2token}}\n' + // 2
-        ' line 3 {{#blockHelperOnLine3}}\n' + // 3
+      ' line 3 {{#blockHelperOnLine3}}\n' + // 3
-        'line 4{{line4token}}\n' + // 4
+      'line 4{{line4token}}\n' + // 4
-        'line5{{else}}\n' + // 5
+      'line5{{else}}\n' + // 5
-        '{{line6Token}}\n' + // 6
+      '{{line6Token}}\n' + // 6
-        '{{/blockHelperOnLine3}}\n' + // 7
+      '{{/blockHelperOnLine3}}\n' + // 7
-        '{{#open}}\n' + // 8
+      '{{#open}}\n' + // 8
-        '{{else inverse}}\n' + // 9
+      '{{else inverse}}\n' + // 9
-        '{{else}}\n' + // 10
+      '{{else}}\n' + // 10
         '{{/open}}'
     ); // 11
+    /* eslint-enable no-multi-spaces */
     body = ast.body;
 
-    it('gets ContentNode line numbers', function () {
+    it('gets ContentNode line numbers', function() {
       var contentNode = body[0];
       testColumns(contentNode, 1, 1, 0, 7);
     });
 
-    it('gets MustacheStatement line numbers', function () {
+    it('gets MustacheStatement line numbers', function() {
       var mustacheNode = body[1];
       testColumns(mustacheNode, 1, 1, 7, 21);
     });
 
-    it('gets line numbers correct when newlines appear', function () {
+    it('gets line numbers correct when newlines appear', function() {
       testColumns(body[2], 1, 2, 21, 8);
     });
 
-    it('gets MustacheStatement line numbers correct across newlines', function () {
+    it('gets MustacheStatement line numbers correct across newlines', function() {
       var secondMustacheStatement = body[3];
       testColumns(secondMustacheStatement, 2, 2, 8, 22);
     });
 
-    it('gets the block helper information correct', function () {
+    it('gets the block helper information correct', function() {
       var blockHelperNode = body[5];
       testColumns(blockHelperNode, 3, 7, 8, 23);
     });
 
-    it('correctly records the line numbers the program of a block helper', function () {
+    it('correctly records the line numbers the program of a block helper', function() {
       var blockHelperNode = body[5],
         program = blockHelperNode.program;
 
       testColumns(program, 3, 5, 31, 5);
     });
 
-    it('correctly records the line numbers of an inverse of a block helper', function () {
+    it('correctly records the line numbers of an inverse of a block helper', function() {
       var blockHelperNode = body[5],
         inverse = blockHelperNode.inverse;
 
       testColumns(inverse, 5, 7, 13, 0);
     });
 
-    it('correctly records the line number of chained inverses', function () {
+    it('correctly records the line number of chained inverses', function() {
       var chainInverseNode = body[7];
 
       testColumns(chainInverseNode.program, 8, 9, 9, 0);
@@ -177,4 +181,251 @@ describe('ast', function () {
       testColumns(chainInverseNode.inverse.body[0].inverse, 10, 11, 8, 0);
     });
   });
+
+  describe('whitespace control', function() {
+    describe('parse', function() {
+      it('mustache', function() {
+        var ast = Handlebars.parse('  {{~comment~}} ');
+
+        equals(ast.body[0].value, '');
+        equals(ast.body[2].value, '');
+      });
+
+      it('block statements', function() {
+        var ast = Handlebars.parse(' {{# comment~}} \nfoo\n {{~/comment}}');
+
+        equals(ast.body[0].value, '');
+        equals(ast.body[1].program.body[0].value, 'foo');
+      });
+    });
+
+    describe('parseWithoutProcessing', function() {
+      it('mustache', function() {
+        var ast = Handlebars.parseWithoutProcessing('  {{~comment~}} ');
+
+        equals(ast.body[0].value, '  ');
+        equals(ast.body[2].value, ' ');
+      });
+
+      it('block statements', function() {
+        var ast = Handlebars.parseWithoutProcessing(
+          ' {{# comment~}} \nfoo\n {{~/comment}}'
+        );
+
+        equals(ast.body[0].value, ' ');
+        equals(ast.body[1].program.body[0].value, ' \nfoo\n ');
+      });
+    });
+  });
+
+  describe('standalone flags', function() {
+    describe('mustache', function() {
+      it('does not mark mustaches as standalone', function() {
+        var ast = Handlebars.parse('  {{comment}} ');
+        equals(!!ast.body[0].value, true);
+        equals(!!ast.body[2].value, true);
+      });
+    });
+    describe('blocks - parseWithoutProcessing', function() {
+      it('block mustaches', function() {
+        var ast = Handlebars.parseWithoutProcessing(
+            ' {{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '
+          ),
+          block = ast.body[1];
+
+        equals(ast.body[0].value, ' ');
+
+        equals(block.program.body[0].value, ' \nfoo\n ');
+        equals(block.inverse.body[0].value, ' \n  bar \n  ');
+
+        equals(ast.body[2].value, ' ');
+      });
+      it('initial block mustaches', function() {
+        var ast = Handlebars.parseWithoutProcessing(
+            '{{# comment}} \nfoo\n {{/comment}}'
+          ),
+          block = ast.body[0];
+
+        equals(block.program.body[0].value, ' \nfoo\n ');
+      });
+      it('mustaches with children', function() {
+        var ast = Handlebars.parseWithoutProcessing(
+            '{{# comment}} \n{{foo}}\n {{/comment}}'
+          ),
+          block = ast.body[0];
+
+        equals(block.program.body[0].value, ' \n');
+        equals(block.program.body[1].path.original, 'foo');
+        equals(block.program.body[2].value, '\n ');
+      });
+      it('nested block mustaches', function() {
+        var ast = Handlebars.parseWithoutProcessing(
+            '{{#foo}} \n{{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} \n{{/foo}}'
+          ),
+          body = ast.body[0].program.body,
+          block = body[1];
+
+        equals(body[0].value, ' \n');
+
+        equals(block.program.body[0].value, ' \nfoo\n ');
+        equals(block.inverse.body[0].value, ' \n  bar \n  ');
+      });
+      it('column 0 block mustaches', function() {
+        var ast = Handlebars.parseWithoutProcessing(
+            'test\n{{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '
+          ),
+          block = ast.body[1];
+
+        equals(ast.body[0].omit, undefined);
+
+        equals(block.program.body[0].value, ' \nfoo\n ');
+        equals(block.inverse.body[0].value, ' \n  bar \n  ');
+
+        equals(ast.body[2].value, ' ');
+      });
+    });
+    describe('blocks', function() {
+      it('marks block mustaches as standalone', function() {
+        var ast = Handlebars.parse(
+            ' {{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '
+          ),
+          block = ast.body[1];
+
+        equals(ast.body[0].value, '');
+
+        equals(block.program.body[0].value, 'foo\n');
+        equals(block.inverse.body[0].value, '  bar \n');
+
+        equals(ast.body[2].value, '');
+      });
+      it('marks initial block mustaches as standalone', function() {
+        var ast = Handlebars.parse('{{# comment}} \nfoo\n {{/comment}}'),
+          block = ast.body[0];
+
+        equals(block.program.body[0].value, 'foo\n');
+      });
+      it('marks mustaches with children as standalone', function() {
+        var ast = Handlebars.parse('{{# comment}} \n{{foo}}\n {{/comment}}'),
+          block = ast.body[0];
+
+        equals(block.program.body[0].value, '');
+        equals(block.program.body[1].path.original, 'foo');
+        equals(block.program.body[2].value, '\n');
+      });
+      it('marks nested block mustaches as standalone', function() {
+        var ast = Handlebars.parse(
+            '{{#foo}} \n{{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} \n{{/foo}}'
+          ),
+          body = ast.body[0].program.body,
+          block = body[1];
+
+        equals(body[0].value, '');
+
+        equals(block.program.body[0].value, 'foo\n');
+        equals(block.inverse.body[0].value, '  bar \n');
+
+        equals(body[0].value, '');
+      });
+      it('does not mark nested block mustaches as standalone', function() {
+        var ast = Handlebars.parse(
+            '{{#foo}} {{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} {{/foo}}'
+          ),
+          body = ast.body[0].program.body,
+          block = body[1];
+
+        equals(body[0].omit, undefined);
+
+        equals(block.program.body[0].value, ' \nfoo\n');
+        equals(block.inverse.body[0].value, '  bar \n  ');
+
+        equals(body[0].omit, undefined);
+      });
+      it('does not mark nested initial block mustaches as standalone', function() {
+        var ast = Handlebars.parse(
+            '{{#foo}}{{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}}{{/foo}}'
+          ),
+          body = ast.body[0].program.body,
+          block = body[0];
+
+        equals(block.program.body[0].value, ' \nfoo\n');
+        equals(block.inverse.body[0].value, '  bar \n  ');
+
+        equals(body[0].omit, undefined);
+      });
+
+      it('marks column 0 block mustaches as standalone', function() {
+        var ast = Handlebars.parse(
+            'test\n{{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '
+          ),
+          block = ast.body[1];
+
+        equals(ast.body[0].omit, undefined);
+
+        equals(block.program.body[0].value, 'foo\n');
+        equals(block.inverse.body[0].value, '  bar \n');
+
+        equals(ast.body[2].value, '');
+      });
+    });
+    describe('partials - parseWithoutProcessing', function() {
+      it('simple partial', function() {
+        var ast = Handlebars.parseWithoutProcessing('{{> partial }} ');
+        equals(ast.body[1].value, ' ');
+      });
+      it('indented partial', function() {
+        var ast = Handlebars.parseWithoutProcessing('  {{> partial }} ');
+        equals(ast.body[0].value, '  ');
+        equals(ast.body[1].indent, '');
+        equals(ast.body[2].value, ' ');
+      });
+    });
+    describe('partials', function() {
+      it('marks partial as standalone', function() {
+        var ast = Handlebars.parse('{{> partial }} ');
+        equals(ast.body[1].value, '');
+      });
+      it('marks indented partial as standalone', function() {
+        var ast = Handlebars.parse('  {{> partial }} ');
+        equals(ast.body[0].value, '');
+        equals(ast.body[1].indent, '  ');
+        equals(ast.body[2].value, '');
+      });
+      it('marks those around content as not standalone', function() {
+        var ast = Handlebars.parse('a{{> partial }}');
+        equals(ast.body[0].omit, undefined);
+
+        ast = Handlebars.parse('{{> partial }}a');
+        equals(ast.body[1].omit, undefined);
+      });
+    });
+    describe('comments - parseWithoutProcessing', function() {
+      it('simple comment', function() {
+        var ast = Handlebars.parseWithoutProcessing('{{! comment }} ');
+        equals(ast.body[1].value, ' ');
+      });
+      it('indented comment', function() {
+        var ast = Handlebars.parseWithoutProcessing('  {{! comment }} ');
+        equals(ast.body[0].value, '  ');
+        equals(ast.body[2].value, ' ');
+      });
+    });
+    describe('comments', function() {
+      it('marks comment as standalone', function() {
+        var ast = Handlebars.parse('{{! comment }} ');
+        equals(ast.body[1].value, '');
+      });
+      it('marks indented comment as standalone', function() {
+        var ast = Handlebars.parse('  {{! comment }} ');
+        equals(ast.body[0].value, '');
+        equals(ast.body[2].value, '');
+      });
+      it('marks those around content as not standalone', function() {
+        var ast = Handlebars.parse('a{{! comment }}');
+        equals(ast.body[0].omit, undefined);
+
+        ast = Handlebars.parse('{{! comment }}a');
+        equals(ast.body[1].omit, undefined);
+      });
+    });
+  });
 });

spec/basic.js

@@ -1,9 +1,17 @@
-describe('basic context', function () {
+global.handlebarsEnv = null;
-  it('most basic', function () {
+
-    expectTemplate('{{foo}}').withInput({ foo: 'foo' }).toCompileTo('foo');
+beforeEach(function() {
+  global.handlebarsEnv = Handlebars.create();
+});
+
+describe('basic context', function() {
+  it('most basic', function() {
+    expectTemplate('{{foo}}')
+      .withInput({ foo: 'foo' })
+      .toCompileTo('foo');
   });
 
-  it('escaping', function () {
+  it('escaping', function() {
     expectTemplate('\\{{foo}}')
       .withInput({ foo: 'food' })
       .toCompileTo('{{foo}}');
@@ -25,21 +33,23 @@ describe('basic context', function () {
       .toCompileTo('\\\\ food');
   });
 
-  it('compiling with a basic context', function () {
+  it('compiling with a basic context', function() {
     expectTemplate('Goodbye\n{{cruel}}\n{{world}}!')
       .withInput({
         cruel: 'cruel',
-        world: 'world',
+        world: 'world'
       })
       .withMessage('It works if all the required keys are provided')
       .toCompileTo('Goodbye\ncruel\nworld!');
   });
 
-  it('compiling with a string context', function () {
+  it('compiling with a string context', function() {
-    expectTemplate('{{.}}{{length}}').withInput('bye').toCompileTo('bye3');
+    expectTemplate('{{.}}{{length}}')
+      .withInput('bye')
+      .toCompileTo('bye3');
   });
 
-  it('compiling with an undefined context', function () {
+  it('compiling with an undefined context', function() {
     expectTemplate('Goodbye\n{{cruel}}\n{{world.bar}}!')
       .withInput(undefined)
       .toCompileTo('Goodbye\n\n!');
@@ -49,11 +59,11 @@ describe('basic context', function () {
       .toCompileTo('Goodbye');
   });
 
-  it('comments', function () {
+  it('comments', function() {
     expectTemplate('{{! Goodbye}}Goodbye\n{{cruel}}\n{{world}}!')
       .withInput({
         cruel: 'cruel',
-        world: 'world',
+        world: 'world'
       })
       .withMessage('comments are ignored')
       .toCompileTo('Goodbye\ncruel\nworld!');
@@ -77,12 +87,12 @@ describe('basic context', function () {
     );
   });
 
-  it('boolean', function () {
+  it('boolean', function() {
     var string = '{{#goodbye}}GOODBYE {{/goodbye}}cruel {{world}}!';
     expectTemplate(string)
       .withInput({
         goodbye: true,
-        world: 'world',
+        world: 'world'
       })
       .withMessage('booleans show the contents when true')
       .toCompileTo('GOODBYE cruel world!');
@@ -90,37 +100,41 @@ describe('basic context', function () {
     expectTemplate(string)
       .withInput({
         goodbye: false,
-        world: 'world',
+        world: 'world'
       })
       .withMessage('booleans do not show the contents when false')
       .toCompileTo('cruel world!');
   });
 
-  it('zeros', function () {
+  it('zeros', function() {
     expectTemplate('num1: {{num1}}, num2: {{num2}}')
       .withInput({
         num1: 42,
-        num2: 0,
+        num2: 0
       })
       .toCompileTo('num1: 42, num2: 0');
 
-    expectTemplate('num: {{.}}').withInput(0).toCompileTo('num: 0');
+    expectTemplate('num: {{.}}')
+      .withInput(0)
+      .toCompileTo('num: 0');
 
     expectTemplate('num: {{num1/num2}}')
       .withInput({ num1: { num2: 0 } })
       .toCompileTo('num: 0');
   });
 
-  it('false', function () {
+  it('false', function() {
     /* eslint-disable no-new-wrappers */
     expectTemplate('val1: {{val1}}, val2: {{val2}}')
       .withInput({
         val1: false,
-        val2: new Boolean(false),
+        val2: new Boolean(false)
       })
       .toCompileTo('val1: false, val2: false');
 
-    expectTemplate('val: {{.}}').withInput(false).toCompileTo('val: false');
+    expectTemplate('val: {{.}}')
+      .withInput(false)
+      .toCompileTo('val: false');
 
     expectTemplate('val: {{val1/val2}}')
       .withInput({ val1: { val2: false } })
@@ -129,7 +143,7 @@ describe('basic context', function () {
     expectTemplate('val1: {{{val1}}}, val2: {{{val2}}}')
       .withInput({
         val1: false,
-        val2: new Boolean(false),
+        val2: new Boolean(false)
       })
       .toCompileTo('val1: false, val2: false');
 
@@ -139,10 +153,10 @@ describe('basic context', function () {
     /* eslint-enable */
   });
 
-  it('should handle undefined and null', function () {
+  it('should handle undefined and null', function() {
     expectTemplate('{{awesome undefined null}}')
       .withInput({
-        awesome: function (_undefined, _null, options) {
+        awesome: function(_undefined, _null, options) {
           return (
             (_undefined === undefined) +
             ' ' +
@@ -150,34 +164,34 @@ describe('basic context', function () {
             ' ' +
             typeof options
           );
-        },
+        }
       })
       .toCompileTo('true true object');
 
     expectTemplate('{{undefined}}')
       .withInput({
-        undefined: function () {
+        undefined: function() {
           return 'undefined!';
-        },
+        }
       })
       .toCompileTo('undefined!');
 
     expectTemplate('{{null}}')
       .withInput({
-        null: function () {
+        null: function() {
           return 'null!';
-        },
+        }
       })
       .toCompileTo('null!');
   });
 
-  it('newlines', function () {
+  it('newlines', function() {
     expectTemplate("Alan's\nTest").toCompileTo("Alan's\nTest");
 
     expectTemplate("Alan's\rTest").toCompileTo("Alan's\rTest");
   });
 
-  it('escaping text', function () {
+  it('escaping text', function() {
     expectTemplate("Awesome's")
       .withMessage(
         "text is escaped so that it doesn't get caught on single quotes"
@@ -202,7 +216,7 @@ describe('basic context', function () {
       .toCompileTo(" ' ' ");
   });
 
-  it('escaping expressions', function () {
+  it('escaping expressions', function() {
     expectTemplate('{{{awesome}}}')
       .withInput({ awesome: "&'\\<>" })
       .withMessage("expressions with 3 handlebars aren't escaped")
@@ -224,140 +238,140 @@ describe('basic context', function () {
       .toCompileTo('Escaped, &lt;b&gt; looks like: &amp;lt;b&amp;gt;');
   });
 
-  it("functions returning safestrings shouldn't be escaped", function () {
+  it("functions returning safestrings shouldn't be escaped", function() {
     expectTemplate('{{awesome}}')
       .withInput({
-        awesome: function () {
+        awesome: function() {
           return new Handlebars.SafeString("&'\\<>");
-        },
+        }
       })
       .withMessage("functions returning safestrings aren't escaped")
       .toCompileTo("&'\\<>");
   });
 
-  it('functions', function () {
+  it('functions', function() {
     expectTemplate('{{awesome}}')
       .withInput({
-        awesome: function () {
+        awesome: function() {
           return 'Awesome';
-        },
+        }
       })
       .withMessage('functions are called and render their output')
       .toCompileTo('Awesome');
 
     expectTemplate('{{awesome}}')
       .withInput({
-        awesome: function () {
+        awesome: function() {
           return this.more;
         },
-        more: 'More awesome',
+        more: 'More awesome'
       })
       .withMessage('functions are bound to the context')
       .toCompileTo('More awesome');
   });
 
-  it('functions with context argument', function () {
+  it('functions with context argument', function() {
     expectTemplate('{{awesome frank}}')
       .withInput({
-        awesome: function (context) {
+        awesome: function(context) {
           return context;
         },
-        frank: 'Frank',
+        frank: 'Frank'
       })
       .withMessage('functions are called with context arguments')
       .toCompileTo('Frank');
   });
 
-  it('pathed functions with context argument', function () {
+  it('pathed functions with context argument', function() {
     expectTemplate('{{bar.awesome frank}}')
       .withInput({
         bar: {
-          awesome: function (context) {
+          awesome: function(context) {
             return context;
-          },
+          }
         },
-        frank: 'Frank',
+        frank: 'Frank'
       })
       .withMessage('functions are called with context arguments')
       .toCompileTo('Frank');
   });
 
-  it('depthed functions with context argument', function () {
+  it('depthed functions with context argument', function() {
     expectTemplate('{{#with frank}}{{../awesome .}}{{/with}}')
       .withInput({
-        awesome: function (context) {
+        awesome: function(context) {
           return context;
         },
-        frank: 'Frank',
+        frank: 'Frank'
       })
       .withMessage('functions are called with context arguments')
       .toCompileTo('Frank');
   });
 
-  it('block functions with context argument', function () {
+  it('block functions with context argument', function() {
     expectTemplate('{{#awesome 1}}inner {{.}}{{/awesome}}')
       .withInput({
-        awesome: function (context, options) {
+        awesome: function(context, options) {
           return options.fn(context);
-        },
+        }
       })
       .withMessage('block functions are called with context and options')
       .toCompileTo('inner 1');
   });
 
-  it('depthed block functions with context argument', function () {
+  it('depthed block functions with context argument', function() {
     expectTemplate(
       '{{#with value}}{{#../awesome 1}}inner {{.}}{{/../awesome}}{{/with}}'
     )
       .withInput({
         value: true,
-        awesome: function (context, options) {
+        awesome: function(context, options) {
           return options.fn(context);
-        },
+        }
       })
       .withMessage('block functions are called with context and options')
       .toCompileTo('inner 1');
   });
 
-  it('block functions without context argument', function () {
+  it('block functions without context argument', function() {
     expectTemplate('{{#awesome}}inner{{/awesome}}')
       .withInput({
-        awesome: function (options) {
+        awesome: function(options) {
           return options.fn(this);
-        },
+        }
       })
       .withMessage('block functions are called with options')
       .toCompileTo('inner');
   });
 
-  it('pathed block functions without context argument', function () {
+  it('pathed block functions without context argument', function() {
     expectTemplate('{{#foo.awesome}}inner{{/foo.awesome}}')
       .withInput({
         foo: {
-          awesome: function () {
+          awesome: function() {
             return this;
-          },
+          }
-        },
+        }
       })
       .withMessage('block functions are called with options')
       .toCompileTo('inner');
   });
 
-  it('depthed block functions without context argument', function () {
+  it('depthed block functions without context argument', function() {
     expectTemplate(
       '{{#with value}}{{#../awesome}}inner{{/../awesome}}{{/with}}'
     )
       .withInput({
         value: true,
-        awesome: function () {
+        awesome: function() {
           return this;
-        },
+        }
       })
       .withMessage('block functions are called with options')
       .toCompileTo('inner');
   });
 
-  it('paths with hyphens', function () {
+  it('paths with hyphens', function() {
     expectTemplate('{{foo-bar}}')
       .withInput({ 'foo-bar': 'baz' })
       .withMessage('Paths can contain hyphens (-)')
@@ -374,28 +388,21 @@ describe('basic context', function () {
       .toCompileTo('baz');
   });
 
-  it('nested paths', function () {
+  it('nested paths', function() {
     expectTemplate('Goodbye {{alan/expression}} world!')
       .withInput({ alan: { expression: 'beautiful' } })
       .withMessage('Nested paths access nested objects')
       .toCompileTo('Goodbye beautiful world!');
   });
 
-  it('nested paths with Map', function () {
+  it('nested paths with empty string value', function() {
-    expectTemplate('Goodbye {{alan/expression}} world!')
-      .withInput({ alan: new Map([['expression', 'beautiful']]) })
-      .withMessage('Nested paths access nested objects')
-      .toCompileTo('Goodbye beautiful world!');
-  });
-
-  it('nested paths with empty string value', function () {
     expectTemplate('Goodbye {{alan/expression}} world!')
       .withInput({ alan: { expression: '' } })
       .withMessage('Nested paths access nested objects with empty string')
       .toCompileTo('Goodbye  world!');
   });
 
-  it('literal paths', function () {
+  it('literal paths', function() {
     expectTemplate('Goodbye {{[@alan]/expression}} world!')
       .withInput({ '@alan': { expression: 'beautiful' } })
       .withMessage('Literal paths can be used')
@@ -407,7 +414,7 @@ describe('basic context', function () {
       .toCompileTo('Goodbye beautiful world!');
   });
 
-  it('literal references', function () {
+  it('literal references', function() {
     expectTemplate('Goodbye {{[foo bar]}} world!')
       .withInput({ 'foo bar': 'beautiful' })
       .toCompileTo('Goodbye beautiful world!');
@@ -433,22 +440,24 @@ describe('basic context', function () {
       .toCompileTo('Goodbye beautiful world!');
   });
 
-  it("that current context path ({{.}}) doesn't hit helpers", function () {
+  it("that current context path ({{.}}) doesn't hit helpers", function() {
     expectTemplate('test: {{.}}')
       .withInput(null)
       .withHelpers({ helper: 'awesome' })
       .toCompileTo('test: ');
   });
 
-  it('complex but empty paths', function () {
+  it('complex but empty paths', function() {
     expectTemplate('{{person/name}}')
       .withInput({ person: { name: null } })
       .toCompileTo('');
 
-    expectTemplate('{{person/name}}').withInput({ person: {} }).toCompileTo('');
+    expectTemplate('{{person/name}}')
+      .withInput({ person: {} })
+      .toCompileTo('');
   });
 
-  it('this keyword in paths', function () {
+  it('this keyword in paths', function() {
     expectTemplate('{{#goodbyes}}{{this}}{{/goodbyes}}')
       .withInput({ goodbyes: ['goodbye', 'Goodbye', 'GOODBYE'] })
       .withMessage('This keyword in paths evaluates to current context')
@@ -456,30 +465,32 @@ describe('basic context', function () {
 
     expectTemplate('{{#hellos}}{{this/text}}{{/hellos}}')
       .withInput({
-        hellos: [{ text: 'hello' }, { text: 'Hello' }, { text: 'HELLO' }],
+        hellos: [{ text: 'hello' }, { text: 'Hello' }, { text: 'HELLO' }]
       })
       .withMessage('This keyword evaluates in more complex paths')
       .toCompileTo('helloHelloHELLO');
   });
 
-  it('this keyword nested inside path', function () {
+  it('this keyword nested inside path', function() {
     expectTemplate('{{#hellos}}{{text/this/foo}}{{/hellos}}').toThrow(
       Error,
       'Invalid path: text/this - 1:13'
     );
 
-    expectTemplate('{{[this]}}').withInput({ this: 'bar' }).toCompileTo('bar');
+    expectTemplate('{{[this]}}')
+      .withInput({ this: 'bar' })
+      .toCompileTo('bar');
 
     expectTemplate('{{text/[this]}}')
       .withInput({ text: { this: 'bar' } })
       .toCompileTo('bar');
   });
 
-  it('this keyword in helpers', function () {
+  it('this keyword in helpers', function() {
     var helpers = {
-      foo: function (value) {
+      foo: function(value) {
         return 'bar ' + value;
-      },
+      }
     };
 
     expectTemplate('{{#goodbyes}}{{foo this}}{{/goodbyes}}')
@@ -490,14 +501,14 @@ describe('basic context', function () {
 
     expectTemplate('{{#hellos}}{{foo this/text}}{{/hellos}}')
       .withInput({
-        hellos: [{ text: 'hello' }, { text: 'Hello' }, { text: 'HELLO' }],
+        hellos: [{ text: 'hello' }, { text: 'Hello' }, { text: 'HELLO' }]
       })
       .withHelpers(helpers)
       .withMessage('This keyword evaluates in more complex paths')
       .toCompileTo('bar hellobar Hellobar HELLO');
   });
 
-  it('this keyword nested inside helpers param', function () {
+  it('this keyword nested inside helpers param', function() {
     expectTemplate('{{#hellos}}{{foo text/this/foo}}{{/hellos}}').toThrow(
       Error,
       'Invalid path: text/this - 1:17'
@@ -505,69 +516,79 @@ describe('basic context', function () {
 
     expectTemplate('{{foo [this]}}')
       .withInput({
-        foo: function (value) {
+        foo: function(value) {
           return value;
         },
-        this: 'bar',
+        this: 'bar'
       })
       .toCompileTo('bar');
 
     expectTemplate('{{foo text/[this]}}')
       .withInput({
-        foo: function (value) {
+        foo: function(value) {
           return value;
         },
-        text: { this: 'bar' },
+        text: { this: 'bar' }
       })
       .toCompileTo('bar');
   });
 
-  it('pass string literals', function () {
+  it('pass string literals', function() {
     expectTemplate('{{"foo"}}').toCompileTo('');
 
-    expectTemplate('{{"foo"}}').withInput({ foo: 'bar' }).toCompileTo('bar');
+    expectTemplate('{{"foo"}}')
+      .withInput({ foo: 'bar' })
+      .toCompileTo('bar');
 
     expectTemplate('{{#"foo"}}{{.}}{{/"foo"}}')
       .withInput({
-        foo: ['bar', 'baz'],
+        foo: ['bar', 'baz']
       })
       .toCompileTo('barbaz');
   });
 
-  it('pass number literals', function () {
+  it('pass number literals', function() {
     expectTemplate('{{12}}').toCompileTo('');
 
-    expectTemplate('{{12}}').withInput({ 12: 'bar' }).toCompileTo('bar');
+    expectTemplate('{{12}}')
+      .withInput({ '12': 'bar' })
+      .toCompileTo('bar');
 
     expectTemplate('{{12.34}}').toCompileTo('');
 
-    expectTemplate('{{12.34}}').withInput({ 12.34: 'bar' }).toCompileTo('bar');
+    expectTemplate('{{12.34}}')
+      .withInput({ '12.34': 'bar' })
+      .toCompileTo('bar');
 
     expectTemplate('{{12.34 1}}')
       .withInput({
-        12.34: function (arg) {
+        '12.34': function(arg) {
           return 'bar' + arg;
-        },
+        }
       })
       .toCompileTo('bar1');
   });
 
-  it('pass boolean literals', function () {
+  it('pass boolean literals', function() {
     expectTemplate('{{true}}').toCompileTo('');
 
-    expectTemplate('{{true}}').withInput({ '': 'foo' }).toCompileTo('');
+    expectTemplate('{{true}}')
+      .withInput({ '': 'foo' })
+      .toCompileTo('');
 
-    expectTemplate('{{false}}').withInput({ false: 'foo' }).toCompileTo('foo');
+    expectTemplate('{{false}}')
+      .withInput({ false: 'foo' })
+      .toCompileTo('foo');
   });
 
-  it('should handle literals in subexpression', function () {
+  it('should handle literals in subexpression', function() {
     expectTemplate('{{foo (false)}}')
       .withInput({
-        false: function () {
+        false: function() {
           return 'bar';
-        },
+        }
       })
-      .withHelper('foo', function (arg) {
+      .withHelper('foo', function(arg) {
         return arg;
       })
       .toCompileTo('bar');

spec/blocks.js

@@ -1,5 +1,5 @@
-describe('blocks', function () {
+describe('blocks', function() {
-  it('array', function () {
+  it('array', function() {
     var string = '{{#goodbyes}}{{text}}! {{/goodbyes}}cruel {{world}}!';
 
     expectTemplate(string)
@@ -7,9 +7,9 @@ describe('blocks', function () {
         goodbyes: [
           { text: 'goodbye' },
           { text: 'Goodbye' },
-          { text: 'GOODBYE' },
+          { text: 'GOODBYE' }
         ],
-        world: 'world',
+        world: 'world'
       })
       .withMessage('Arrays iterate over the contents when not empty')
       .toCompileTo('goodbye! Goodbye! GOODBYE! cruel world!');
@@ -17,13 +17,13 @@ describe('blocks', function () {
     expectTemplate(string)
       .withInput({
         goodbyes: [],
-        world: 'world',
+        world: 'world'
       })
       .withMessage('Arrays ignore the contents when empty')
       .toCompileTo('cruel world!');
   });
 
-  it('array without data', function () {
+  it('array without data', function() {
     expectTemplate(
       '{{#goodbyes}}{{text}}{{/goodbyes}} {{#goodbyes}}{{text}}{{/goodbyes}}'
     )
@@ -31,15 +31,15 @@ describe('blocks', function () {
         goodbyes: [
           { text: 'goodbye' },
           { text: 'Goodbye' },
-          { text: 'GOODBYE' },
+          { text: 'GOODBYE' }
         ],
-        world: 'world',
+        world: 'world'
       })
       .withCompileOptions({ compat: false })
       .toCompileTo('goodbyeGoodbyeGOODBYE goodbyeGoodbyeGOODBYE');
   });
 
-  it('array with @index', function () {
+  it('array with @index', function() {
     expectTemplate(
       '{{#goodbyes}}{{@index}}. {{text}}! {{/goodbyes}}cruel {{world}}!'
     )
@@ -47,15 +47,15 @@ describe('blocks', function () {
         goodbyes: [
           { text: 'goodbye' },
           { text: 'Goodbye' },
-          { text: 'GOODBYE' },
+          { text: 'GOODBYE' }
         ],
-        world: 'world',
+        world: 'world'
       })
       .withMessage('The @index variable is used')
       .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
   });
 
-  it('empty block', function () {
+  it('empty block', function() {
     var string = '{{#goodbyes}}{{/goodbyes}}cruel {{world}}!';
 
     expectTemplate(string)
@@ -63,9 +63,9 @@ describe('blocks', function () {
         goodbyes: [
           { text: 'goodbye' },
           { text: 'Goodbye' },
-          { text: 'GOODBYE' },
+          { text: 'GOODBYE' }
         ],
-        world: 'world',
+        world: 'world'
       })
       .withMessage('Arrays iterate over the contents when not empty')
       .toCompileTo('cruel world!');
@@ -73,21 +73,21 @@ describe('blocks', function () {
     expectTemplate(string)
       .withInput({
         goodbyes: [],
-        world: 'world',
+        world: 'world'
       })
       .withMessage('Arrays ignore the contents when empty')
       .toCompileTo('cruel world!');
   });
 
-  it('block with complex lookup', function () {
+  it('block with complex lookup', function() {
     expectTemplate('{{#goodbyes}}{{text}} cruel {{../name}}! {{/goodbyes}}')
       .withInput({
         name: 'Alan',
         goodbyes: [
           { text: 'goodbye' },
           { text: 'Goodbye' },
-          { text: 'GOODBYE' },
+          { text: 'GOODBYE' }
-        ],
+        ]
       })
       .withMessage(
         'Templates can access variables in contexts up the stack with relative path syntax'
@@ -97,37 +97,37 @@ describe('blocks', function () {
       );
   });
 
-  it('multiple blocks with complex lookup', function () {
+  it('multiple blocks with complex lookup', function() {
     expectTemplate('{{#goodbyes}}{{../name}}{{../name}}{{/goodbyes}}')
       .withInput({
         name: 'Alan',
         goodbyes: [
           { text: 'goodbye' },
           { text: 'Goodbye' },
-          { text: 'GOODBYE' },
+          { text: 'GOODBYE' }
-        ],
+        ]
       })
       .toCompileTo('AlanAlanAlanAlanAlanAlan');
   });
 
-  it('block with complex lookup using nested context', function () {
+  it('block with complex lookup using nested context', function() {
     expectTemplate(
       '{{#goodbyes}}{{text}} cruel {{foo/../name}}! {{/goodbyes}}'
     ).toThrow(Error);
   });
 
-  it('block with deep nested complex lookup', function () {
+  it('block with deep nested complex lookup', function() {
     expectTemplate(
       '{{#outer}}Goodbye {{#inner}}cruel {{../sibling}} {{../../omg}}{{/inner}}{{/outer}}'
     )
       .withInput({
         omg: 'OMG!',
-        outer: [{ sibling: 'sad', inner: [{ text: 'goodbye' }] }],
+        outer: [{ sibling: 'sad', inner: [{ text: 'goodbye' }] }]
       })
       .toCompileTo('Goodbye cruel sad OMG!');
   });
 
-  it('works with cached blocks', function () {
+  it('works with cached blocks', function() {
     expectTemplate(
       '{{#each person}}{{#with .}}{{first}} {{last}}{{/with}}{{/each}}'
     )
@@ -135,14 +135,14 @@ describe('blocks', function () {
       .withInput({
         person: [
           { first: 'Alan', last: 'Johnson' },
-          { first: 'Alan', last: 'Johnson' },
+          { first: 'Alan', last: 'Johnson' }
-        ],
+        ]
       })
       .toCompileTo('Alan JohnsonAlan Johnson');
   });
 
-  describe('inverted sections', function () {
+  describe('inverted sections', function() {
-    it('inverted sections with unset value', function () {
+    it('inverted sections with unset value', function() {
       expectTemplate(
         '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}'
       )
@@ -150,7 +150,7 @@ describe('blocks', function () {
         .toCompileTo('Right On!');
     });
 
-    it('inverted section with false value', function () {
+    it('inverted section with false value', function() {
       expectTemplate(
         '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}'
       )
@@ -159,7 +159,7 @@ describe('blocks', function () {
         .toCompileTo('Right On!');
     });
 
-    it('inverted section with empty set', function () {
+    it('inverted section with empty set', function() {
       expectTemplate(
         '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}'
       )
@@ -168,13 +168,13 @@ describe('blocks', function () {
         .toCompileTo('Right On!');
     });
 
-    it('block inverted sections', function () {
+    it('block inverted sections', function() {
       expectTemplate('{{#people}}{{name}}{{^}}{{none}}{{/people}}')
         .withInput({ none: 'No people' })
         .toCompileTo('No people');
     });
 
-    it('chained inverted sections', function () {
+    it('chained inverted sections', function() {
       expectTemplate('{{#people}}{{name}}{{else if none}}{{none}}{{/people}}')
         .withInput({ none: 'No people' })
         .toCompileTo('No people');
@@ -192,24 +192,24 @@ describe('blocks', function () {
         .toCompileTo('No people');
     });
 
-    it('chained inverted sections with mismatch', function () {
+    it('chained inverted sections with mismatch', function() {
       expectTemplate(
         '{{#people}}{{name}}{{else if none}}{{none}}{{/if}}'
       ).toThrow(Error);
     });
 
-    it('block inverted sections with empty arrays', function () {
+    it('block inverted sections with empty arrays', function() {
       expectTemplate('{{#people}}{{name}}{{^}}{{none}}{{/people}}')
         .withInput({
           none: 'No people',
-          people: [],
+          people: []
         })
         .toCompileTo('No people');
     });
   });
 
-  describe('standalone sections', function () {
+  describe('standalone sections', function() {
-    it('block standalone else sections', function () {
+    it('block standalone else sections', function() {
       expectTemplate('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n')
         .withInput({ none: 'No people' })
         .toCompileTo('No people\n');
@@ -223,7 +223,7 @@ describe('blocks', function () {
         .toCompileTo('No people\n');
     });
 
-    it('block standalone else sections can be disabled', function () {
+    it('block standalone else sections can be disabled', function() {
       expectTemplate('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n')
         .withInput({ none: 'No people' })
         .withCompileOptions({ ignoreStandalone: true })
@@ -235,7 +235,7 @@ describe('blocks', function () {
         .toCompileTo('\nNo people\n\n');
     });
 
-    it('block standalone chained else sections', function () {
+    it('block standalone chained else sections', function() {
       expectTemplate(
         '{{#people}}\n{{name}}\n{{else if none}}\n{{none}}\n{{/people}}\n'
       )
@@ -249,17 +249,17 @@ describe('blocks', function () {
         .toCompileTo('No people\n');
     });
 
-    it('should handle nesting', function () {
+    it('should handle nesting', function() {
       expectTemplate('{{#data}}\n{{#if true}}\n{{.}}\n{{/if}}\n{{/data}}\nOK.')
         .withInput({
-          data: [1, 3, 5],
+          data: [1, 3, 5]
         })
         .toCompileTo('1\n3\n5\nOK.');
     });
   });
 
-  describe('compat mode', function () {
+  describe('compat mode', function() {
-    it('block with deep recursive lookup lookup', function () {
+    it('block with deep recursive lookup lookup', function() {
       expectTemplate(
         '{{#outer}}Goodbye {{#inner}}cruel {{omg}}{{/inner}}{{/outer}}'
       )
@@ -268,108 +268,108 @@ describe('blocks', function () {
         .toCompileTo('Goodbye cruel OMG!');
     });
 
-    it('block with deep recursive pathed lookup', function () {
+    it('block with deep recursive pathed lookup', function() {
       expectTemplate(
         '{{#outer}}Goodbye {{#inner}}cruel {{omg.yes}}{{/inner}}{{/outer}}'
       )
         .withInput({
           omg: { yes: 'OMG!' },
-          outer: [{ inner: [{ yes: 'no', text: 'goodbye' }] }],
+          outer: [{ inner: [{ yes: 'no', text: 'goodbye' }] }]
         })
         .withCompileOptions({ compat: true })
         .toCompileTo('Goodbye cruel OMG!');
     });
 
-    it('block with missed recursive lookup', function () {
+    it('block with missed recursive lookup', function() {
       expectTemplate(
         '{{#outer}}Goodbye {{#inner}}cruel {{omg.yes}}{{/inner}}{{/outer}}'
       )
         .withInput({
           omg: { no: 'OMG!' },
-          outer: [{ inner: [{ yes: 'no', text: 'goodbye' }] }],
+          outer: [{ inner: [{ yes: 'no', text: 'goodbye' }] }]
         })
         .withCompileOptions({ compat: true })
         .toCompileTo('Goodbye cruel ');
     });
   });
 
-  describe('decorators', function () {
+  describe('decorators', function() {
-    it('should apply mustache decorators', function () {
+    it('should apply mustache decorators', function() {
       expectTemplate('{{#helper}}{{*decorator}}{{/helper}}')
-        .withHelper('helper', function (options) {
+        .withHelper('helper', function(options) {
           return options.fn.run;
         })
-        .withDecorator('decorator', function (fn) {
+        .withDecorator('decorator', function(fn) {
           fn.run = 'success';
           return fn;
         })
         .toCompileTo('success');
     });
 
-    it('should apply allow undefined return', function () {
+    it('should apply allow undefined return', function() {
       expectTemplate('{{#helper}}{{*decorator}}suc{{/helper}}')
-        .withHelper('helper', function (options) {
+        .withHelper('helper', function(options) {
           return options.fn() + options.fn.run;
         })
-        .withDecorator('decorator', function (fn) {
+        .withDecorator('decorator', function(fn) {
           fn.run = 'cess';
         })
         .toCompileTo('success');
     });
 
-    it('should apply block decorators', function () {
+    it('should apply block decorators', function() {
       expectTemplate(
         '{{#helper}}{{#*decorator}}success{{/decorator}}{{/helper}}'
       )
-        .withHelper('helper', function (options) {
+        .withHelper('helper', function(options) {
           return options.fn.run;
         })
-        .withDecorator('decorator', function (fn, props, container, options) {
+        .withDecorator('decorator', function(fn, props, container, options) {
           fn.run = options.fn();
           return fn;
         })
         .toCompileTo('success');
     });
 
-    it('should support nested decorators', function () {
+    it('should support nested decorators', function() {
       expectTemplate(
         '{{#helper}}{{#*decorator}}{{#*nested}}suc{{/nested}}cess{{/decorator}}{{/helper}}'
       )
-        .withHelper('helper', function (options) {
+        .withHelper('helper', function(options) {
           return options.fn.run;
         })
         .withDecorators({
-          decorator: function (fn, props, container, options) {
+          decorator: function(fn, props, container, options) {
             fn.run = options.fn.nested + options.fn();
             return fn;
           },
-          nested: function (fn, props, container, options) {
+          nested: function(fn, props, container, options) {
             props.nested = options.fn();
-          },
+          }
         })
         .toCompileTo('success');
     });
 
-    it('should apply multiple decorators', function () {
+    it('should apply multiple decorators', function() {
       expectTemplate(
         '{{#helper}}{{#*decorator}}suc{{/decorator}}{{#*decorator}}cess{{/decorator}}{{/helper}}'
       )
-        .withHelper('helper', function (options) {
+        .withHelper('helper', function(options) {
           return options.fn.run;
         })
-        .withDecorator('decorator', function (fn, props, container, options) {
+        .withDecorator('decorator', function(fn, props, container, options) {
           fn.run = (fn.run || '') + options.fn();
           return fn;
         })
         .toCompileTo('success');
     });
 
-    it('should access parent variables', function () {
+    it('should access parent variables', function() {
       expectTemplate('{{#helper}}{{*decorator foo}}{{/helper}}')
-        .withHelper('helper', function (options) {
+        .withHelper('helper', function(options) {
           return options.fn.run;
         })
-        .withDecorator('decorator', function (fn, props, container, options) {
+        .withDecorator('decorator', function(fn, props, container, options) {
           fn.run = options.args;
           return fn;
         })
@@ -377,75 +377,79 @@ describe('blocks', function () {
         .toCompileTo('success');
     });
 
-    it('should work with root program', function () {
+    it('should work with root program', function() {
       var run;
       expectTemplate('{{*decorator "success"}}')
-        .withDecorator('decorator', function (fn, props, container, options) {
+        .withDecorator('decorator', function(fn, props, container, options) {
-          expect(options.args[0]).toBe('success');
+          equals(options.args[0], 'success');
           run = true;
           return fn;
         })
         .withInput({ foo: 'success' })
         .toCompileTo('');
-      expect(run).toBe(true);
+      equals(run, true);
     });
 
-    it('should fail when accessing variables from root', function () {
+    it('should fail when accessing variables from root', function() {
       var run;
       expectTemplate('{{*decorator foo}}')
-        .withDecorator('decorator', function (fn, props, container, options) {
+        .withDecorator('decorator', function(fn, props, container, options) {
-          expect(options.args[0]).toBeUndefined();
+          equals(options.args[0], undefined);
           run = true;
           return fn;
         })
         .withInput({ foo: 'fail' })
         .toCompileTo('');
-      expect(run).toBe(true);
+      equals(run, true);
     });
 
-    describe('registration', function () {
+    describe('registration', function() {
-      it('unregisters', function () {
+      it('unregisters', function() {
         handlebarsEnv.decorators = {};
 
-        handlebarsEnv.registerDecorator('foo', function () {
+        handlebarsEnv.registerDecorator('foo', function() {
           return 'fail';
         });
 
-        expect(handlebarsEnv.decorators.foo).toBeTruthy();
+        equals(!!handlebarsEnv.decorators.foo, true);
         handlebarsEnv.unregisterDecorator('foo');
-        expect(handlebarsEnv.decorators.foo).toBeUndefined();
+        equals(handlebarsEnv.decorators.foo, undefined);
       });
 
-      it('allows multiple globals', function () {
+      it('allows multiple globals', function() {
         handlebarsEnv.decorators = {};
 
         handlebarsEnv.registerDecorator({
-          foo: function () {},
+          foo: function() {},
-          bar: function () {},
+          bar: function() {}
         });
 
-        expect(handlebarsEnv.decorators.foo).toBeTruthy();
+        equals(!!handlebarsEnv.decorators.foo, true);
-        expect(handlebarsEnv.decorators.bar).toBeTruthy();
+        equals(!!handlebarsEnv.decorators.bar, true);
         handlebarsEnv.unregisterDecorator('foo');
         handlebarsEnv.unregisterDecorator('bar');
-        expect(handlebarsEnv.decorators.foo).toBeUndefined();
+        equals(handlebarsEnv.decorators.foo, undefined);
-        expect(handlebarsEnv.decorators.bar).toBeUndefined();
+        equals(handlebarsEnv.decorators.bar, undefined);
       });
 
-      it('fails with multiple and args', function () {
+      it('fails with multiple and args', function() {
-        expect(function () {
+        shouldThrow(
-          handlebarsEnv.registerDecorator(
+          function() {
-            {
+            handlebarsEnv.registerDecorator(
-              world: function () {
+              {
-                return 'world!';
+                world: function() {
+                  return 'world!';
+                },
+                testHelper: function() {
+                  return 'found it!';
+                }
               },
-              testHelper: function () {
+              {}
-                return 'found it!';
+            );
-              },
+          },
-            },
+          Error,
-            {}
+          'Arg not supported with multiple decorators'
-          );
+        );
-        }).toThrow('Arg not supported with multiple decorators');
       });
     });
   });

spec/builtins.js

@@ -1,12 +1,12 @@
-describe('builtin helpers', function () {
+describe('builtin helpers', function() {
-  describe('#if', function () {
+  describe('#if', function() {
-    it('if', function () {
+    it('if', function() {
       var string = '{{#if goodbye}}GOODBYE {{/if}}cruel {{world}}!';
 
       expectTemplate(string)
         .withInput({
           goodbye: true,
-          world: 'world',
+          world: 'world'
         })
         .withMessage('if with boolean argument shows the contents when true')
         .toCompileTo('GOODBYE cruel world!');
@@ -14,7 +14,7 @@ describe('builtin helpers', function () {
       expectTemplate(string)
         .withInput({
           goodbye: 'dummy',
-          world: 'world',
+          world: 'world'
         })
         .withMessage('if with string argument shows the contents')
         .toCompileTo('GOODBYE cruel world!');
@@ -22,7 +22,7 @@ describe('builtin helpers', function () {
       expectTemplate(string)
         .withInput({
           goodbye: false,
-          world: 'world',
+          world: 'world'
         })
         .withMessage(
           'if with boolean argument does not show the contents when false'
@@ -37,7 +37,7 @@ describe('builtin helpers', function () {
       expectTemplate(string)
         .withInput({
           goodbye: ['foo'],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('if with non-empty array shows the contents')
         .toCompileTo('GOODBYE cruel world!');
@@ -45,7 +45,7 @@ describe('builtin helpers', function () {
       expectTemplate(string)
         .withInput({
           goodbye: [],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('if with empty array does not show the contents')
         .toCompileTo('cruel world!');
@@ -53,7 +53,7 @@ describe('builtin helpers', function () {
       expectTemplate(string)
         .withInput({
           goodbye: 0,
-          world: 'world',
+          world: 'world'
         })
         .withMessage('if with zero does not show the contents')
         .toCompileTo('cruel world!');
@@ -63,21 +63,21 @@ describe('builtin helpers', function () {
       )
         .withInput({
           goodbye: 0,
-          world: 'world',
+          world: 'world'
         })
         .withMessage('if with zero does not show the contents')
         .toCompileTo('GOODBYE cruel world!');
     });
 
-    it('if with function argument', function () {
+    it('if with function argument', function() {
       var string = '{{#if goodbye}}GOODBYE {{/if}}cruel {{world}}!';
 
       expectTemplate(string)
         .withInput({
-          goodbye: function () {
+          goodbye: function() {
             return true;
           },
-          world: 'world',
+          world: 'world'
         })
         .withMessage(
           'if with function shows the contents when function returns true'
@@ -86,10 +86,10 @@ describe('builtin helpers', function () {
 
       expectTemplate(string)
         .withInput({
-          goodbye: function () {
+          goodbye: function() {
             return this.world;
           },
-          world: 'world',
+          world: 'world'
         })
         .withMessage(
           'if with function shows the contents when function returns string'
@@ -98,10 +98,10 @@ describe('builtin helpers', function () {
 
       expectTemplate(string)
         .withInput({
-          goodbye: function () {
+          goodbye: function() {
             return false;
           },
-          world: 'world',
+          world: 'world'
         })
         .withMessage(
           'if with function does not show the contents when returns false'
@@ -110,10 +110,10 @@ describe('builtin helpers', function () {
 
       expectTemplate(string)
         .withInput({
-          goodbye: function () {
+          goodbye: function() {
             return this.foo;
           },
-          world: 'world',
+          world: 'world'
         })
         .withMessage(
           'if with function does not show the contents when returns undefined'
@@ -121,61 +121,61 @@ describe('builtin helpers', function () {
         .toCompileTo('cruel world!');
     });
 
-    it('should not change the depth list', function () {
+    it('should not change the depth list', function() {
       expectTemplate(
         '{{#with foo}}{{#if goodbye}}GOODBYE cruel {{../world}}!{{/if}}{{/with}}'
       )
         .withInput({
           foo: { goodbye: true },
-          world: 'world',
+          world: 'world'
         })
         .toCompileTo('GOODBYE cruel world!');
     });
   });
 
-  describe('#with', function () {
+  describe('#with', function() {
-    it('with', function () {
+    it('with', function() {
       expectTemplate('{{#with person}}{{first}} {{last}}{{/with}}')
         .withInput({
           person: {
             first: 'Alan',
-            last: 'Johnson',
+            last: 'Johnson'
-          },
+          }
         })
         .toCompileTo('Alan Johnson');
     });
 
-    it('with with function argument', function () {
+    it('with with function argument', function() {
       expectTemplate('{{#with person}}{{first}} {{last}}{{/with}}')
         .withInput({
-          person: function () {
+          person: function() {
             return {
               first: 'Alan',
-              last: 'Johnson',
+              last: 'Johnson'
             };
-          },
+          }
         })
         .toCompileTo('Alan Johnson');
     });
 
-    it('with with else', function () {
+    it('with with else', function() {
       expectTemplate(
         '{{#with person}}Person is present{{else}}Person is not present{{/with}}'
       ).toCompileTo('Person is not present');
     });
 
-    it('with provides block parameter', function () {
+    it('with provides block parameter', function() {
       expectTemplate('{{#with person as |foo|}}{{foo.first}} {{last}}{{/with}}')
         .withInput({
           person: {
             first: 'Alan',
-            last: 'Johnson',
+            last: 'Johnson'
-          },
+          }
         })
         .toCompileTo('Alan Johnson');
     });
 
-    it('works when data is disabled', function () {
+    it('works when data is disabled', function() {
       expectTemplate('{{#with person as |foo|}}{{foo.first}} {{last}}{{/with}}')
         .withInput({ person: { first: 'Alan', last: 'Johnson' } })
         .withCompileOptions({ data: false })
@@ -183,14 +183,14 @@ describe('builtin helpers', function () {
     });
   });
 
-  describe('#each', function () {
+  describe('#each', function() {
-    beforeEach(function () {
+    beforeEach(function() {
-      handlebarsEnv.registerHelper('detectDataInsideEach', function (options) {
+      handlebarsEnv.registerHelper('detectDataInsideEach', function(options) {
         return options.data && options.data.exclaim;
       });
     });
 
-    it('each', function () {
+    it('each', function() {
       var string = '{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!';
 
       expectTemplate(string)
@@ -198,9 +198,9 @@ describe('builtin helpers', function () {
           goodbyes: [
             { text: 'goodbye' },
             { text: 'Goodbye' },
-            { text: 'GOODBYE' },
+            { text: 'GOODBYE' }
           ],
-          world: 'world',
+          world: 'world'
         })
         .withMessage(
           'each with array argument iterates over the contents when not empty'
@@ -210,21 +210,21 @@ describe('builtin helpers', function () {
       expectTemplate(string)
         .withInput({
           goodbyes: [],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('each with array argument ignores the contents when empty')
         .toCompileTo('cruel world!');
     });
 
-    it('each without data', function () {
+    it('each without data', function() {
       expectTemplate('{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!')
         .withInput({
           goodbyes: [
             { text: 'goodbye' },
             { text: 'Goodbye' },
-            { text: 'GOODBYE' },
+            { text: 'GOODBYE' }
           ],
-          world: 'world',
+          world: 'world'
         })
         .withRuntimeOptions({ data: false })
         .withCompileOptions({ data: false })
@@ -237,13 +237,13 @@ describe('builtin helpers', function () {
         .toCompileTo('cruelworld');
     });
 
-    it('each without context', function () {
+    it('each without context', function() {
       expectTemplate('{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!')
         .withInput(undefined)
         .toCompileTo('cruel !');
     });
 
-    it('each with an object and @key', function () {
+    it('each with an object and @key', function() {
       var string =
         '{{#each goodbyes}}{{@key}}. {{text}}! {{/each}}cruel {{world}}!';
 
@@ -257,23 +257,27 @@ describe('builtin helpers', function () {
       // Object property iteration order is undefined according to ECMA spec,
       // so we need to check both possible orders
       // @see http://stackoverflow.com/questions/280713/elements-order-in-a-for-in-loop
-      var actual = CompilerContext.compile(string)(hash);
+      var actual = compileWithPartials(string, hash);
       var expected1 =
         '<b>#1</b>. goodbye! 2. GOODBYE! cruel world!';
       var expected2 =
         '2. GOODBYE! <b>#1</b>. goodbye! cruel world!';
 
-      expect([expected1, expected2]).toContain(actual);
+      equals(
+        actual === expected1 || actual === expected2,
+        true,
+        'each with object argument iterates over the contents when not empty'
+      );
 
       expectTemplate(string)
         .withInput({
           goodbyes: {},
-          world: 'world',
+          world: 'world'
         })
         .toCompileTo('cruel world!');
     });
 
-    it('each with @index', function () {
+    it('each with @index', function() {
       expectTemplate(
         '{{#each goodbyes}}{{@index}}. {{text}}! {{/each}}cruel {{world}}!'
       )
@@ -281,15 +285,15 @@ describe('builtin helpers', function () {
           goodbyes: [
             { text: 'goodbye' },
             { text: 'Goodbye' },
-            { text: 'GOODBYE' },
+            { text: 'GOODBYE' }
           ],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @index variable is used')
         .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
     });
 
-    it('each with nested @index', function () {
+    it('each with nested @index', function() {
       expectTemplate(
         '{{#each goodbyes}}{{@index}}. {{text}}! {{#each ../goodbyes}}{{@index}} {{/each}}After {{@index}} {{/each}}{{@index}}cruel {{world}}!'
       )
@@ -297,9 +301,9 @@ describe('builtin helpers', function () {
           goodbyes: [
             { text: 'goodbye' },
             { text: 'Goodbye' },
-            { text: 'GOODBYE' },
+            { text: 'GOODBYE' }
           ],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @index variable is used')
         .toCompileTo(
@@ -307,20 +311,20 @@ describe('builtin helpers', function () {
         );
     });
 
-    it('each with block params', function () {
+    it('each with block params', function() {
       expectTemplate(
         '{{#each goodbyes as |value index|}}{{index}}. {{value.text}}! {{#each ../goodbyes as |childValue childIndex|}} {{index}} {{childIndex}}{{/each}} After {{index}} {{/each}}{{index}}cruel {{world}}!'
       )
         .withInput({
           goodbyes: [{ text: 'goodbye' }, { text: 'Goodbye' }],
-          world: 'world',
+          world: 'world'
         })
         .toCompileTo(
           '0. goodbye!  0 0 0 1 After 0 1. Goodbye!  1 0 1 1 After 1 cruel world!'
         );
     });
 
-    it('each with block params and strict compilation', function () {
+    it('each with block params and strict compilation', function() {
       expectTemplate(
         '{{#each goodbyes as |value index|}}{{index}}. {{value.text}}!{{/each}}'
       )
@@ -329,7 +333,7 @@ describe('builtin helpers', function () {
         .toCompileTo('0. goodbye!1. Goodbye!');
     });
 
-    it('each object with @index', function () {
+    it('each object with @index', function() {
       expectTemplate(
         '{{#each goodbyes}}{{@index}}. {{text}}! {{/each}}cruel {{world}}!'
       )
@@ -337,15 +341,15 @@ describe('builtin helpers', function () {
           goodbyes: {
             a: { text: 'goodbye' },
             b: { text: 'Goodbye' },
-            c: { text: 'GOODBYE' },
+            c: { text: 'GOODBYE' }
           },
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @index variable is used')
         .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
     });
 
-    it('each with @first', function () {
+    it('each with @first', function() {
       expectTemplate(
         '{{#each goodbyes}}{{#if @first}}{{text}}! {{/if}}{{/each}}cruel {{world}}!'
       )
@@ -353,15 +357,15 @@ describe('builtin helpers', function () {
           goodbyes: [
             { text: 'goodbye' },
             { text: 'Goodbye' },
-            { text: 'GOODBYE' },
+            { text: 'GOODBYE' }
           ],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @first variable is used')
         .toCompileTo('goodbye! cruel world!');
     });
 
-    it('each with nested @first', function () {
+    it('each with nested @first', function() {
       expectTemplate(
         '{{#each goodbyes}}({{#if @first}}{{text}}! {{/if}}{{#each ../goodbyes}}{{#if @first}}{{text}}!{{/if}}{{/each}}{{#if @first}} {{text}}!{{/if}}) {{/each}}cruel {{world}}!'
       )
@@ -369,9 +373,9 @@ describe('builtin helpers', function () {
           goodbyes: [
             { text: 'goodbye' },
             { text: 'Goodbye' },
-            { text: 'GOODBYE' },
+            { text: 'GOODBYE' }
           ],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @first variable is used')
         .toCompileTo(
@@ -379,19 +383,19 @@ describe('builtin helpers', function () {
         );
     });
 
-    it('each object with @first', function () {
+    it('each object with @first', function() {
       expectTemplate(
         '{{#each goodbyes}}{{#if @first}}{{text}}! {{/if}}{{/each}}cruel {{world}}!'
       )
         .withInput({
           goodbyes: { foo: { text: 'goodbye' }, bar: { text: 'Goodbye' } },
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @first variable is used')
         .toCompileTo('goodbye! cruel world!');
     });
 
-    it('each with @last', function () {
+    it('each with @last', function() {
       expectTemplate(
         '{{#each goodbyes}}{{#if @last}}{{text}}! {{/if}}{{/each}}cruel {{world}}!'
       )
@@ -399,27 +403,27 @@ describe('builtin helpers', function () {
           goodbyes: [
             { text: 'goodbye' },
             { text: 'Goodbye' },
-            { text: 'GOODBYE' },
+            { text: 'GOODBYE' }
           ],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @last variable is used')
         .toCompileTo('GOODBYE! cruel world!');
     });
 
-    it('each object with @last', function () {
+    it('each object with @last', function() {
       expectTemplate(
         '{{#each goodbyes}}{{#if @last}}{{text}}! {{/if}}{{/each}}cruel {{world}}!'
       )
         .withInput({
           goodbyes: { foo: { text: 'goodbye' }, bar: { text: 'Goodbye' } },
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @last variable is used')
         .toCompileTo('Goodbye! cruel world!');
     });
 
-    it('each with nested @last', function () {
+    it('each with nested @last', function() {
       expectTemplate(
         '{{#each goodbyes}}({{#if @last}}{{text}}! {{/if}}{{#each ../goodbyes}}{{#if @last}}{{text}}!{{/if}}{{/each}}{{#if @last}} {{text}}!{{/if}}) {{/each}}cruel {{world}}!'
       )
@@ -427,9 +431,9 @@ describe('builtin helpers', function () {
           goodbyes: [
             { text: 'goodbye' },
             { text: 'Goodbye' },
-            { text: 'GOODBYE' },
+            { text: 'GOODBYE' }
           ],
-          world: 'world',
+          world: 'world'
         })
         .withMessage('The @last variable is used')
         .toCompileTo(
@@ -437,19 +441,19 @@ describe('builtin helpers', function () {
         );
     });
 
-    it('each with function argument', function () {
+    it('each with function argument', function() {
       var string = '{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!';
 
       expectTemplate(string)
         .withInput({
-          goodbyes: function () {
+          goodbyes: function() {
             return [
               { text: 'goodbye' },
               { text: 'Goodbye' },
-              { text: 'GOODBYE' },
+              { text: 'GOODBYE' }
             ];
           },
-          world: 'world',
+          world: 'world'
         })
         .withMessage(
           'each with array function argument iterates over the contents when not empty'
@@ -459,7 +463,7 @@ describe('builtin helpers', function () {
       expectTemplate(string)
         .withInput({
           goodbyes: [],
-          world: 'world',
+          world: 'world'
         })
         .withMessage(
           'each with array function argument ignores the contents when empty'
@@ -467,7 +471,7 @@ describe('builtin helpers', function () {
         .toCompileTo('cruel world!');
     });
 
-    it('each object when last key is an empty string', function () {
+    it('each object when last key is an empty string', function() {
       expectTemplate(
         '{{#each goodbyes}}{{@index}}. {{text}}! {{/each}}cruel {{world}}!'
       )
@@ -475,15 +479,15 @@ describe('builtin helpers', function () {
           goodbyes: {
             a: { text: 'goodbye' },
             b: { text: 'Goodbye' },
-            '': { text: 'GOODBYE' },
+            '': { text: 'GOODBYE' }
           },
-          world: 'world',
+          world: 'world'
         })
         .withMessage('Empty string key is not skipped')
         .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
     });
 
-    it('data passed to helpers', function () {
+    it('data passed to helpers', function() {
       expectTemplate(
         '{{#each letters}}{{this}}{{detectDataInsideEach}}{{/each}}'
       )
@@ -491,70 +495,26 @@ describe('builtin helpers', function () {
         .withMessage('should output data')
         .withRuntimeOptions({
           data: {
-            exclaim: '!',
+            exclaim: '!'
-          },
+          }
         })
         .toCompileTo('a!b!c!');
     });
 
-    it('each on implicit context', function () {
+    it('each on implicit context', function() {
       expectTemplate('{{#each}}{{text}}! {{/each}}cruel world!').toThrow(
         handlebarsEnv.Exception,
         'Must pass iterator to #each'
       );
     });
 
-    it('each on Map', function () {
-      var map = new Map([
-        [1, 'one'],
-        [2, 'two'],
-        [3, 'three'],
-      ]);
-
-      expectTemplate('{{#each map}}{{@key}}(i{{@index}}) {{.}} {{/each}}')
-        .withInput({ map: map })
-        .toCompileTo('1(i0) one 2(i1) two 3(i2) three ');
-
-      expectTemplate('{{#each map}}{{#if @first}}{{.}}{{/if}}{{/each}}')
-        .withInput({ map: map })
-        .toCompileTo('one');
-
-      expectTemplate('{{#each map}}{{#if @last}}{{.}}{{/if}}{{/each}}')
-        .withInput({ map: map })
-        .toCompileTo('three');
-
-      expectTemplate('{{#each map}}{{.}}{{/each}}not-in-each')
-        .withInput({ map: new Map() })
-        .toCompileTo('not-in-each');
-    });
-
-    it('each on Set', function () {
-      var set = new Set([1, 2, 3]);
-
-      expectTemplate('{{#each set}}{{@key}}(i{{@index}}) {{.}} {{/each}}')
-        .withInput({ set: set })
-        .toCompileTo('0(i0) 1 1(i1) 2 2(i2) 3 ');
-
-      expectTemplate('{{#each set}}{{#if @first}}{{.}}{{/if}}{{/each}}')
-        .withInput({ set: set })
-        .toCompileTo('1');
-
-      expectTemplate('{{#each set}}{{#if @last}}{{.}}{{/if}}{{/each}}')
-        .withInput({ set: set })
-        .toCompileTo('3');
-
-      expectTemplate('{{#each set}}{{.}}{{/each}}not-in-each')
-        .withInput({ set: new Set() })
-        .toCompileTo('not-in-each');
-    });
-
     if (global.Symbol && global.Symbol.iterator) {
-      it('each on iterable', function () {
+      it('each on iterable', function() {
         function Iterator(arr) {
           this.arr = arr;
           this.index = 0;
         }
-        Iterator.prototype.next = function () {
+        Iterator.prototype.next = function() {
           var value = this.arr[this.index];
           var done = this.index === this.arr.length;
           if (!done) {
@@ -565,7 +525,7 @@ describe('builtin helpers', function () {
         function Iterable(arr) {
           this.arr = arr;
         }
-        Iterable.prototype[global.Symbol.iterator] = function () {
+        Iterable.prototype[global.Symbol.iterator] = function() {
           return new Iterator(this.arr);
         };
         var string = '{{#each goodbyes}}{{text}}! {{/each}}cruel {{world}}!';
@@ -575,9 +535,9 @@ describe('builtin helpers', function () {
             goodbyes: new Iterable([
               { text: 'goodbye' },
               { text: 'Goodbye' },
-              { text: 'GOODBYE' },
+              { text: 'GOODBYE' }
             ]),
-            world: 'world',
+            world: 'world'
           })
           .withMessage(
             'each with array argument iterates over the contents when not empty'
@@ -587,7 +547,7 @@ describe('builtin helpers', function () {
         expectTemplate(string)
           .withInput({
             goodbyes: new Iterable([]),
-            world: 'world',
+            world: 'world'
           })
           .withMessage(
             'each with array argument ignores the contents when empty'
@@ -597,27 +557,27 @@ describe('builtin helpers', function () {
     }
   });
 
-  describe('#log', function () {
+  describe('#log', function() {
     /* eslint-disable no-console */
     if (typeof console === 'undefined') {
       return;
     }
 
     var $log, $info, $error;
-    beforeEach(function () {
+    beforeEach(function() {
       $log = console.log;
       $info = console.info;
       $error = console.error;
     });
-    afterEach(function () {
+    afterEach(function() {
       console.log = $log;
       console.info = $info;
       console.error = $error;
     });
 
-    it('should call logger at default level', function () {
+    it('should call logger at default level', function() {
       var levelArg, logArg;
-      handlebarsEnv.log = function (level, arg) {
+      handlebarsEnv.log = function(level, arg) {
         levelArg = level;
         logArg = arg;
       };
@@ -626,13 +586,13 @@ describe('builtin helpers', function () {
         .withInput({ blah: 'whee' })
         .withMessage('log should not display')
         .toCompileTo('');
-      expect(levelArg).toBe(1);
+      equals(1, levelArg, 'should call log with 1');
-      expect(logArg).toBe('whee');
+      equals('whee', logArg, "should call log with 'whee'");
     });
 
-    it('should call logger at data level', function () {
+    it('should call logger at data level', function() {
       var levelArg, logArg;
-      handlebarsEnv.log = function (level, arg) {
+      handlebarsEnv.log = function(level, arg) {
         levelArg = level;
         logArg = arg;
       };
@@ -642,21 +602,21 @@ describe('builtin helpers', function () {
         .withRuntimeOptions({ data: { level: '03' } })
         .withCompileOptions({ data: true })
         .toCompileTo('');
-      expect(levelArg).toBe('03');
+      equals('03', levelArg);
-      expect(logArg).toBe('whee');
+      equals('whee', logArg);
     });
 
-    it('should output to info', function () {
+    it('should output to info', function() {
       var called;
 
-      console.info = function (info) {
+      console.info = function(info) {
-        expect(info).toBe('whee');
+        equals('whee', info);
         called = true;
         console.info = $info;
         console.log = $log;
       };
-      console.log = function (log) {
+      console.log = function(log) {
-        expect(log).toBe('whee');
+        equals('whee', log);
         called = true;
         console.info = $info;
         console.log = $log;
@@ -665,14 +625,14 @@ describe('builtin helpers', function () {
       expectTemplate('{{log blah}}')
         .withInput({ blah: 'whee' })
         .toCompileTo('');
-      expect(called).toBe(true);
+      equals(true, called);
     });
 
-    it('should log at data level', function () {
+    it('should log at data level', function() {
       var called;
 
-      console.error = function (log) {
+      console.error = function(log) {
-        expect(log).toBe('whee');
+        equals('whee', log);
         called = true;
         console.error = $error;
       };
@@ -682,15 +642,15 @@ describe('builtin helpers', function () {
         .withRuntimeOptions({ data: { level: '03' } })
         .withCompileOptions({ data: true })
         .toCompileTo('');
-      expect(called).toBe(true);
+      equals(true, called);
     });
 
-    it('should handle missing logger', function () {
+    it('should handle missing logger', function() {
       var called = false;
 
       console.error = undefined;
-      console.log = function (log) {
+      console.log = function(log) {
-        expect(log).toBe('whee');
+        equals('whee', log);
         called = true;
         console.log = $log;
       };
@@ -700,14 +660,14 @@ describe('builtin helpers', function () {
         .withRuntimeOptions({ data: { level: '03' } })
         .withCompileOptions({ data: true })
         .toCompileTo('');
-      expect(called).toBe(true);
+      equals(true, called);
     });
 
-    it('should handle string log levels', function () {
+    it('should handle string log levels', function() {
       var called;
 
-      console.error = function (log) {
+      console.error = function(log) {
-        expect(log).toBe('whee');
+        equals('whee', log);
         called = true;
       };
 
@@ -716,7 +676,7 @@ describe('builtin helpers', function () {
         .withRuntimeOptions({ data: { level: 'error' } })
         .withCompileOptions({ data: true })
         .toCompileTo('');
-      expect(called).toBe(true);
+      equals(true, called);
 
       called = false;
 
@@ -725,48 +685,44 @@ describe('builtin helpers', function () {
         .withRuntimeOptions({ data: { level: 'ERROR' } })
         .withCompileOptions({ data: true })
         .toCompileTo('');
-      expect(called).toBe(true);
+      equals(true, called);
     });
 
-    it('should handle hash log levels', function () {
+    it('should handle hash log levels', function() {
       var called;
 
-      console.error = function (log) {
+      console.error = function(log) {
-        expect(log).toBe('whee');
+        equals('whee', log);
         called = true;
       };
 
       expectTemplate('{{log blah level="error"}}')
         .withInput({ blah: 'whee' })
         .toCompileTo('');
-      expect(called).toBe(true);
+      equals(true, called);
     });
 
-    it('should handle hash log levels', function () {
+    it('should handle hash log levels', function() {
       var called = false;
 
-      console.info =
+      console.info = console.log = console.error = console.debug = function() {
-        console.log =
+        called = true;
-        console.error =
+        console.info = console.log = console.error = console.debug = $log;
-        console.debug =
+      };
-          function () {
-            called = true;
-            console.info = console.log = console.error = console.debug = $log;
-          };
 
       expectTemplate('{{log blah level="debug"}}')
         .withInput({ blah: 'whee' })
         .toCompileTo('');
-      expect(called).toBe(false);
+      equals(false, called);
     });
 
-    it('should pass multiple log arguments', function () {
+    it('should pass multiple log arguments', function() {
       var called;
 
-      console.info = console.log = function (log1, log2, log3) {
+      console.info = console.log = function(log1, log2, log3) {
-        expect(log1).toBe('whee');
+        equals('whee', log1);
-        expect(log2).toBe('foo');
+        equals('foo', log2);
-        expect(log3).toBe(1);
+        equals(1, log3);
         called = true;
         console.log = $log;
       };
@@ -774,32 +730,34 @@ describe('builtin helpers', function () {
       expectTemplate('{{log blah "foo" 1}}')
         .withInput({ blah: 'whee' })
         .toCompileTo('');
-      expect(called).toBe(true);
+      equals(true, called);
     });
 
-    it('should pass zero log arguments', function () {
+    it('should pass zero log arguments', function() {
       var called;
 
-      console.info = console.log = function () {
+      console.info = console.log = function() {
-        expect(arguments.length).toBe(0);
+        expect(arguments.length).to.equal(0);
         called = true;
         console.log = $log;
       };
 
-      expectTemplate('{{log}}').withInput({ blah: 'whee' }).toCompileTo('');
+      expectTemplate('{{log}}')
-      expect(called).toBe(true);
+        .withInput({ blah: 'whee' })
+        .toCompileTo('');
+      expect(called).to.be.true();
     });
     /* eslint-enable no-console */
   });
 
-  describe('#lookup', function () {
+  describe('#lookup', function() {
-    it('should lookup arbitrary content', function () {
+    it('should lookup arbitrary content', function() {
       expectTemplate('{{#each goodbyes}}{{lookup ../data .}}{{/each}}')
         .withInput({ goodbyes: [0, 1], data: ['foo', 'bar'] })
         .toCompileTo('foobar');
     });
 
-    it('should not fail on undefined value', function () {
+    it('should not fail on undefined value', function() {
       expectTemplate('{{#each goodbyes}}{{lookup ../bar .}}{{/each}}')
         .withInput({ goodbyes: [0, 1], data: ['foo', 'bar'] })
         .toCompileTo('');

spec/compiler.js

@@ -1,160 +1,297 @@
-describe('compiler', function () {
+describe('compiler', function() {
   if (!Handlebars.compile) {
     return;
   }
 
-  describe('#equals', function () {
+  describe('#equals', function() {
     function compile(string) {
       var ast = Handlebars.parse(string);
       return new Handlebars.Compiler().compile(ast, {});
     }
 
-    it('should treat as equal', function () {
+    it('should treat as equal', function() {
-      expect(compile('foo').equals(compile('foo'))).toBe(true);
+      equal(compile('foo').equals(compile('foo')), true);
-      expect(compile('{{foo}}').equals(compile('{{foo}}'))).toBe(true);
+      equal(compile('{{foo}}').equals(compile('{{foo}}')), true);
-      expect(compile('{{foo.bar}}').equals(compile('{{foo.bar}}'))).toBe(true);
+      equal(compile('{{foo.bar}}').equals(compile('{{foo.bar}}')), true);
-      expect(
+      equal(
         compile('{{foo.bar baz "foo" true false bat=1}}').equals(
           compile('{{foo.bar baz "foo" true false bat=1}}')
-        )
+        ),
-      ).toBe(true);
+        true
-      expect(
+      );
+      equal(
         compile('{{foo.bar (baz bat=1)}}').equals(
           compile('{{foo.bar (baz bat=1)}}')
-        )
+        ),
-      ).toBe(true);
+        true
-      expect(
+      );
-        compile('{{#foo}} {{/foo}}').equals(compile('{{#foo}} {{/foo}}'))
+      equal(
-      ).toBe(true);
+        compile('{{#foo}} {{/foo}}').equals(compile('{{#foo}} {{/foo}}')),
+        true
+      );
     });
-    it('should treat as not equal', function () {
+    it('should treat as not equal', function() {
-      expect(compile('foo').equals(compile('bar'))).toBe(false);
+      equal(compile('foo').equals(compile('bar')), false);
-      expect(compile('{{foo}}').equals(compile('{{bar}}'))).toBe(false);
+      equal(compile('{{foo}}').equals(compile('{{bar}}')), false);
-      expect(compile('{{foo.bar}}').equals(compile('{{bar.bar}}'))).toBe(false);
+      equal(compile('{{foo.bar}}').equals(compile('{{bar.bar}}')), false);
-      expect(
+      equal(
         compile('{{foo.bar baz bat=1}}').equals(
           compile('{{foo.bar bar bat=1}}')
-        )
+        ),
-      ).toBe(false);
+        false
-      expect(
+      );
+      equal(
         compile('{{foo.bar (baz bat=1)}}').equals(
           compile('{{foo.bar (bar bat=1)}}')
-        )
+        ),
-      ).toBe(false);
+        false
-      expect(
+      );
-        compile('{{#foo}} {{/foo}}').equals(compile('{{#bar}} {{/bar}}'))
+      equal(
-      ).toBe(false);
+        compile('{{#foo}} {{/foo}}').equals(compile('{{#bar}} {{/bar}}')),
-      expect(
+        false
-        compile('{{#foo}} {{/foo}}').equals(compile('{{#foo}} {{foo}}{{/foo}}'))
+      );
-      ).toBe(false);
+      equal(
+        compile('{{#foo}} {{/foo}}').equals(
+          compile('{{#foo}} {{foo}}{{/foo}}')
+        ),
+        false
+      );
     });
   });
 
-  describe('#compile', function () {
+  describe('#compile', function() {
-    it('should fail with invalid input', function () {
+    it('should fail with invalid input', function() {
-      expect(function () {
+      shouldThrow(
-        Handlebars.compile(null);
+        function() {
-      }).toThrow(
+          Handlebars.compile(null);
+        },
+        Error,
         'You must pass a string or Handlebars AST to Handlebars.compile. You passed null'
       );
-      expect(function () {
+      shouldThrow(
-        Handlebars.compile({});
+        function() {
-      }).toThrow(
+          Handlebars.compile({});
+        },
+        Error,
         'You must pass a string or Handlebars AST to Handlebars.compile. You passed [object Object]'
       );
     });
 
-    it('should include the location in the error (row and column)', function () {
+    it('should include the location in the error (row and column)', function() {
       try {
         Handlebars.compile(' \n  {{#if}}\n{{/def}}')();
-        expect.unreachable('Statement must throw exception');
+        equal(
+          true,
+          false,
+          'Statement must throw exception. This line should not be executed.'
+        );
       } catch (err) {
-        expect(err.message).toBe("if doesn't match def - 2:5");
+        equal(
+          err.message,
+          "if doesn't match def - 2:5",
+          'Checking error message'
+        );
         if (Object.getOwnPropertyDescriptor(err, 'column').writable) {
           // In Safari 8, the column-property is read-only. This means that even if it is set with defineProperty,
           // its value won't change (https://github.com/jquery/esprima/issues/1290#issuecomment-132455482)
           // Since this was neither working in Handlebars 3 nor in 4.0.5, we only check the column for other browsers.
-          expect(err.column).toBe(5);
+          equal(err.column, 5, 'Checking error column');
         }
-        expect(err.lineNumber).toBe(2);
+        equal(err.lineNumber, 2, 'Checking error row');
       }
     });
 
-    it('should include the location as enumerable property', function () {
+    it('should include the location as enumerable property', function() {
       try {
         Handlebars.compile(' \n  {{#if}}\n{{/def}}')();
-        expect.unreachable('Statement must throw exception');
+        equal(
+          true,
+          false,
+          'Statement must throw exception. This line should not be executed.'
+        );
       } catch (err) {
-        expect(Object.prototype.propertyIsEnumerable.call(err, 'column')).toBe(
+        equal(
-          true
+          Object.prototype.propertyIsEnumerable.call(err, 'column'),
+          true,
+          'Checking error column'
         );
       }
     });
 
-    it('can utilize AST instance', function () {
+    it('can utilize AST instance', function() {
-      expect(
+      equal(
         Handlebars.compile({
           type: 'Program',
-          body: [{ type: 'ContentStatement', value: 'Hello' }],
+          body: [{ type: 'ContentStatement', value: 'Hello' }]
-        })()
+        })(),
-      ).toBe('Hello');
+        'Hello'
-    });
-
-    it('can pass through an empty string', function () {
-      expect(Handlebars.compile('')()).toBe('');
-    });
-
-    it('throws on desupported options', function () {
-      expect(function () {
-        Handlebars.compile('Dudes', { trackIds: true });
-      }).toThrow(
-        'TrackIds and stringParams are no longer supported. See Github #1145'
-      );
-      expect(function () {
-        Handlebars.compile('Dudes', { stringParams: true });
-      }).toThrow(
-        'TrackIds and stringParams are no longer supported. See Github #1145'
       );
     });
 
-    it('should not modify the options.data property(GH-1327)', function () {
+    function createPathExpressionAST(depth, parts) {
+      return {
+        type: 'Program',
+        body: [
+          {
+            type: 'MustacheStatement',
+            escaped: true,
+            strip: { open: false, close: false },
+            path: {
+              type: 'PathExpression',
+              data: false,
+              depth: depth,
+              parts: parts,
+              original: 'this'
+            },
+            params: []
+          }
+        ]
+      };
+    }
+
+    it('should safely handle AST with non-integer PathExpression depth', function() {
+      // depth '0' is coerced to 0 via Number(), compiles safely
+      var result = Handlebars.compile(createPathExpressionAST('0', ['this']))();
+      expect(result).to.be.a('string');
+    });
+
+    it('should safely handle AST with negative PathExpression depth', function() {
+      // Negative depth is clamped to 0
+      var result = Handlebars.compile(createPathExpressionAST(-1, ['this']))();
+      expect(result).to.be.a('string');
+    });
+
+    it('should safely handle AST with fractional PathExpression depth', function() {
+      // Fractional depth is floored to an integer
+      var result = Handlebars.compile(createPathExpressionAST(0.5, ['this']))();
+      expect(result).to.be.a('string');
+    });
+
+    it('should safely handle AST with non-array PathExpression parts', function() {
+      // Non-array parts are coerced to empty array, compiles safely
+      var result = Handlebars.compile(createPathExpressionAST(0, 'this'))();
+      expect(result).to.be.a('string');
+    });
+
+    it('should safely handle AST with non-string PathExpression part', function() {
+      // Non-string parts are coerced to strings via String()
+      var result = Handlebars.compile(createPathExpressionAST(0, [1]))();
+      expect(result).to.be.a('string');
+    });
+
+    it('should safely handle AST with non-boolean BooleanLiteral value type', function() {
+      // The compiler coerces BooleanLiteral.value via === true before
+      // emitting a pushLiteral opcode, so a non-boolean value like the
+      // string 'true' becomes the literal 'false'.
+      var loc = {
+        source: null,
+        start: { line: 1, column: 0 },
+        end: { line: 1, column: 10 }
+      };
+      var result = Handlebars.compile({
+        type: 'Program',
+        body: [
+          {
+            type: 'MustacheStatement',
+            escaped: true,
+            strip: { open: false, close: false },
+            loc: loc,
+            path: {
+              type: 'BooleanLiteral',
+              value: 'true',
+              original: true,
+              loc: loc
+            },
+            params: []
+          }
+        ]
+      })();
+      // 'true' !== true, so the compiler emits pushLiteral('false').
+      // Handlebars does not render falsy values, so the output is empty.
+      expect(result).to.equal('');
+    });
+
+    it('should ignore loc metadata in AST nodes', function() {
+      equal(
+        Handlebars.compile({
+          type: 'Program',
+          meta: null,
+          loc: { source: 'fake', start: { line: 1, column: 0 } },
+          body: [{ type: 'ContentStatement', value: 'Hello' }]
+        })(),
+        'Hello'
+      );
+    });
+
+    it('should accept AST with valid NumberLiteral values', function() {
+      equal(
+        Handlebars.compile(Handlebars.parse('{{lookup this 1}}'))(['a', 'b']),
+        'b'
+      );
+    });
+
+    it('should accept AST with valid BooleanLiteral values', function() {
+      equal(
+        Handlebars.compile(Handlebars.parse('{{#if true}}ok{{/if}}'))({}),
+        'ok'
+      );
+    });
+
+    it('can pass through an empty string', function() {
+      equal(Handlebars.compile('')(), '');
+    });
+
+    it('should not modify the options.data property(GH-1327)', function() {
       var options = { data: [{ a: 'foo' }, { a: 'bar' }] };
       Handlebars.compile('{{#each data}}{{@index}}:{{a}} {{/each}}', options)();
-      expect(options).toStrictEqual({ data: [{ a: 'foo' }, { a: 'bar' }] });
+      equal(
+        JSON.stringify(options, 0, 2),
+        JSON.stringify({ data: [{ a: 'foo' }, { a: 'bar' }] }, 0, 2)
+      );
     });
 
-    it('should not modify the options.knownHelpers property(GH-1327)', function () {
+    it('should not modify the options.knownHelpers property(GH-1327)', function() {
       var options = { knownHelpers: {} };
       Handlebars.compile('{{#each data}}{{@index}}:{{a}} {{/each}}', options)();
-      expect(options).toStrictEqual({ knownHelpers: {} });
+      equal(
+        JSON.stringify(options, 0, 2),
+        JSON.stringify({ knownHelpers: {} }, 0, 2)
+      );
     });
   });
 
-  describe('#precompile', function () {
+  describe('#precompile', function() {
-    it('should fail with invalid input', function () {
+    it('should fail with invalid input', function() {
-      expect(function () {
+      shouldThrow(
-        Handlebars.precompile(null);
+        function() {
-      }).toThrow(
+          Handlebars.precompile(null);
-        'You must pass a string or Handlebars AST to Handlebars.compile. You passed null'
+        },
+        Error,
+        'You must pass a string or Handlebars AST to Handlebars.precompile. You passed null'
       );
-      expect(function () {
+      shouldThrow(
-        Handlebars.precompile({});
+        function() {
-      }).toThrow(
+          Handlebars.precompile({});
-        'You must pass a string or Handlebars AST to Handlebars.compile. You passed [object Object]'
+        },
+        Error,
+        'You must pass a string or Handlebars AST to Handlebars.precompile. You passed [object Object]'
       );
     });
 
-    it('can utilize AST instance', function () {
+    it('can utilize AST instance', function() {
-      expect(
+      equal(
-        Handlebars.precompile({
+        /return "Hello"/.test(
-          type: 'Program',
+          Handlebars.precompile({
-          body: [{ type: 'ContentStatement', value: 'Hello' }],
+            type: 'Program',
-        })
+            body: [{ type: 'ContentStatement', value: 'Hello' }]
-      ).toMatch(/return "Hello"/);
+          })
+        ),
+        true
+      );
     });
 
-    it('can pass through an empty string', function () {
+    it('can pass through an empty string', function() {
-      expect(Handlebars.precompile('')).toMatch(/return ""/);
+      equal(/return ""/.test(Handlebars.precompile('')), true);
     });
   });
 });

spec/data.js

@@ -1,8 +1,8 @@
-describe('data', function () {
+describe('data', function() {
-  it('passing in data to a compiled function that expects data - works with helpers', function () {
+  it('passing in data to a compiled function that expects data - works with helpers', function() {
     expectTemplate('{{hello}}')
       .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
+      .withHelper('hello', function(options) {
         return options.data.adjective + ' ' + this.noun;
       })
       .withRuntimeOptions({ data: { adjective: 'happy' } })
@@ -11,17 +11,17 @@ describe('data', function () {
       .toCompileTo('happy cat');
   });
 
-  it('data can be looked up via @foo', function () {
+  it('data can be looked up via @foo', function() {
     expectTemplate('{{@hello}}')
       .withRuntimeOptions({ data: { hello: 'hello' } })
       .withMessage('@foo retrieves template data')
       .toCompileTo('hello');
   });
 
-  it('deep @foo triggers automatic top-level data', function () {
+  it('deep @foo triggers automatic top-level data', function() {
     var helpers = Handlebars.createFrame(handlebarsEnv.helpers);
 
-    helpers.let = function (options) {
+    helpers.let = function(options) {
       var frame = Handlebars.createFrame(options.data);
 
       for (var prop in options.hash) {
@@ -41,83 +41,83 @@ describe('data', function () {
       .toCompileTo('Hello world');
   });
 
-  it('parameter data can be looked up via @foo', function () {
+  it('parameter data can be looked up via @foo', function() {
     expectTemplate('{{hello @world}}')
       .withRuntimeOptions({ data: { world: 'world' } })
-      .withHelper('hello', function (noun) {
+      .withHelper('hello', function(noun) {
         return 'Hello ' + noun;
       })
       .withMessage('@foo as a parameter retrieves template data')
       .toCompileTo('Hello world');
   });
 
-  it('hash values can be looked up via @foo', function () {
+  it('hash values can be looked up via @foo', function() {
     expectTemplate('{{hello noun=@world}}')
       .withRuntimeOptions({ data: { world: 'world' } })
-      .withHelper('hello', function (options) {
+      .withHelper('hello', function(options) {
         return 'Hello ' + options.hash.noun;
       })
       .withMessage('@foo as a parameter retrieves template data')
       .toCompileTo('Hello world');
   });
 
-  it('nested parameter data can be looked up via @foo.bar', function () {
+  it('nested parameter data can be looked up via @foo.bar', function() {
     expectTemplate('{{hello @world.bar}}')
       .withRuntimeOptions({ data: { world: { bar: 'world' } } })
-      .withHelper('hello', function (noun) {
+      .withHelper('hello', function(noun) {
         return 'Hello ' + noun;
       })
       .withMessage('@foo as a parameter retrieves template data')
       .toCompileTo('Hello world');
   });
 
-  it('nested parameter data does not fail with @world.bar', function () {
+  it('nested parameter data does not fail with @world.bar', function() {
     expectTemplate('{{hello @world.bar}}')
       .withRuntimeOptions({ data: { foo: { bar: 'world' } } })
-      .withHelper('hello', function (noun) {
+      .withHelper('hello', function(noun) {
         return 'Hello ' + noun;
       })
       .withMessage('@foo as a parameter retrieves template data')
       .toCompileTo('Hello undefined');
   });
 
-  it('parameter data throws when using complex scope references', function () {
+  it('parameter data throws when using complex scope references', function() {
     expectTemplate(
       '{{#goodbyes}}{{text}} cruel {{@foo/../name}}! {{/goodbyes}}'
     ).toThrow(Error);
   });
 
-  it('data can be functions', function () {
+  it('data can be functions', function() {
     expectTemplate('{{@hello}}')
       .withRuntimeOptions({
         data: {
-          hello: function () {
+          hello: function() {
             return 'hello';
-          },
+          }
-        },
+        }
       })
       .toCompileTo('hello');
   });
 
-  it('data can be functions with params', function () {
+  it('data can be functions with params', function() {
     expectTemplate('{{@hello "hello"}}')
       .withRuntimeOptions({
         data: {
-          hello: function (arg) {
+          hello: function(arg) {
             return arg;
-          },
+          }
-        },
+        }
       })
       .toCompileTo('hello');
   });
 
-  it('data is inherited downstream', function () {
+  it('data is inherited downstream', function() {
     expectTemplate(
       '{{#let foo=1 bar=2}}{{#let foo=bar.baz}}{{@bar}}{{@foo}}{{/let}}{{@foo}}{{/let}}'
     )
       .withInput({ bar: { baz: 'hello world' } })
       .withCompileOptions({ data: true })
-      .withHelper('let', function (options) {
+      .withHelper('let', function(options) {
         var frame = Handlebars.createFrame(options.data);
         for (var prop in options.hash) {
           if (prop in options.hash) {
@@ -131,11 +131,11 @@ describe('data', function () {
       .toCompileTo('2hello world1');
   });
 
-  it('passing in data to a compiled function that expects data - works with helpers in partials', function () {
+  it('passing in data to a compiled function that expects data - works with helpers in partials', function() {
     expectTemplate('{{>myPartial}}')
       .withCompileOptions({ data: true })
       .withPartial('myPartial', '{{hello}}')
-      .withHelper('hello', function (options) {
+      .withHelper('hello', function(options) {
         return options.data.adjective + ' ' + this.noun;
       })
       .withInput({ noun: 'cat' })
@@ -144,10 +144,10 @@ describe('data', function () {
       .toCompileTo('happy cat');
   });
 
-  it('passing in data to a compiled function that expects data - works with helpers and parameters', function () {
+  it('passing in data to a compiled function that expects data - works with helpers and parameters', function() {
     expectTemplate('{{hello world}}')
       .withCompileOptions({ data: true })
-      .withHelper('hello', function (noun, options) {
+      .withHelper('hello', function(noun, options) {
         return options.data.adjective + ' ' + noun + (this.exclaim ? '!' : '');
       })
       .withInput({ exclaim: true, world: 'world' })
@@ -156,15 +156,15 @@ describe('data', function () {
       .toCompileTo('happy world!');
   });
 
-  it('passing in data to a compiled function that expects data - works with block helpers', function () {
+  it('passing in data to a compiled function that expects data - works with block helpers', function() {
     expectTemplate('{{#hello}}{{world}}{{/hello}}')
       .withCompileOptions({
-        data: true,
+        data: true
       })
-      .withHelper('hello', function (options) {
+      .withHelper('hello', function(options) {
         return options.fn(this);
       })
-      .withHelper('world', function (options) {
+      .withHelper('world', function(options) {
         return options.data.adjective + ' world' + (this.exclaim ? '!' : '');
       })
       .withInput({ exclaim: true })
@@ -173,13 +173,13 @@ describe('data', function () {
       .toCompileTo('happy world!');
   });
 
-  it('passing in data to a compiled function that expects data - works with block helpers that use ..', function () {
+  it('passing in data to a compiled function that expects data - works with block helpers that use ..', function() {
     expectTemplate('{{#hello}}{{world ../zomg}}{{/hello}}')
       .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
+      .withHelper('hello', function(options) {
         return options.fn({ exclaim: '?' });
       })
-      .withHelper('world', function (thing, options) {
+      .withHelper('world', function(thing, options) {
         return options.data.adjective + ' ' + thing + (this.exclaim || '');
       })
       .withInput({ exclaim: true, zomg: 'world' })
@@ -188,13 +188,13 @@ describe('data', function () {
       .toCompileTo('happy world?');
   });
 
-  it('passing in data to a compiled function that expects data - data is passed to with block helpers where children use ..', function () {
+  it('passing in data to a compiled function that expects data - data is passed to with block helpers where children use ..', function() {
     expectTemplate('{{#hello}}{{world ../zomg}}{{/hello}}')
       .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
+      .withHelper('hello', function(options) {
         return options.data.accessData + ' ' + options.fn({ exclaim: '?' });
       })
-      .withHelper('world', function (thing, options) {
+      .withHelper('world', function(thing, options) {
         return options.data.adjective + ' ' + thing + (this.exclaim || '');
       })
       .withInput({ exclaim: true, zomg: 'world' })
@@ -203,41 +203,41 @@ describe('data', function () {
       .toCompileTo('#win happy world?');
   });
 
-  it('you can override inherited data when invoking a helper', function () {
+  it('you can override inherited data when invoking a helper', function() {
     expectTemplate('{{#hello}}{{world zomg}}{{/hello}}')
       .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
+      .withHelper('hello', function(options) {
         return options.fn(
           { exclaim: '?', zomg: 'world' },
           { data: { adjective: 'sad' } }
         );
       })
-      .withHelper('world', function (thing, options) {
+      .withHelper('world', function(thing, options) {
         return options.data.adjective + ' ' + thing + (this.exclaim || '');
       })
       .withInput({ exclaim: true, zomg: 'planet' })
       .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .withMessage('Overridden data output by helper')
+      .withMessage('Overriden data output by helper')
       .toCompileTo('sad world?');
   });
 
-  it('you can override inherited data when invoking a helper with depth', function () {
+  it('you can override inherited data when invoking a helper with depth', function() {
     expectTemplate('{{#hello}}{{world ../zomg}}{{/hello}}')
       .withCompileOptions({ data: true })
-      .withHelper('hello', function (options) {
+      .withHelper('hello', function(options) {
         return options.fn({ exclaim: '?' }, { data: { adjective: 'sad' } });
       })
-      .withHelper('world', function (thing, options) {
+      .withHelper('world', function(thing, options) {
         return options.data.adjective + ' ' + thing + (this.exclaim || '');
       })
       .withInput({ exclaim: true, zomg: 'world' })
       .withRuntimeOptions({ data: { adjective: 'happy' } })
-      .withMessage('Overridden data output by helper')
+      .withMessage('Overriden data output by helper')
       .toCompileTo('sad world?');
   });
 
-  describe('@root', function () {
+  describe('@root', function() {
-    it('the root context can be looked up via @root', function () {
+    it('the root context can be looked up via @root', function() {
       expectTemplate('{{@root.foo}}')
         .withInput({ foo: 'hello' })
         .withRuntimeOptions({ data: {} })
@@ -248,7 +248,7 @@ describe('data', function () {
         .toCompileTo('hello');
     });
 
-    it('passed root values take priority', function () {
+    it('passed root values take priority', function() {
       expectTemplate('{{@root.foo}}')
         .withInput({ foo: 'should not be used' })
         .withRuntimeOptions({ data: { root: { foo: 'hello' } } })
@@ -256,21 +256,21 @@ describe('data', function () {
     });
   });
 
-  describe('nesting', function () {
+  describe('nesting', function() {
-    it('the root context can be looked up via @root', function () {
+    it('the root context can be looked up via @root', function() {
       expectTemplate(
         '{{#helper}}{{#helper}}{{@./depth}} {{@../depth}} {{@../../depth}}{{/helper}}{{/helper}}'
       )
         .withInput({ foo: 'hello' })
-        .withHelper('helper', function (options) {
+        .withHelper('helper', function(options) {
           var frame = Handlebars.createFrame(options.data);
           frame.depth = options.data.depth + 1;
           return options.fn(this, { data: frame });
         })
         .withRuntimeOptions({
           data: {
-            depth: 0,
+            depth: 0
-          },
+          }
         })
         .toCompileTo('2 1 0');
     });

spec/env/browser-vitest-pre.js

@@ -1,6 +0,0 @@
-// Pre-setup for browser tests. Must run before the main setup file
-// imports the Handlebars library, so that noConflict() captures this value.
-globalThis.Handlebars = 'no-conflict';
-
-// Polyfill Node.js 'global' for specs that reference it at module level
-globalThis.global = globalThis;

spec/env/browser-vitest.js

@@ -1,27 +0,0 @@
-import './common.js';
-import Handlebars from '../../lib/handlebars.js';
-
-globalThis.Handlebars = Handlebars;
-
-globalThis.CompilerContext = {
-  browser: true,
-
-  compile: function (template, options) {
-    var templateSpec = handlebarsEnv.precompile(template, options);
-    return handlebarsEnv.template(safeEval(templateSpec));
-  },
-  compileWithPartial: function (template, options) {
-    return handlebarsEnv.compile(template, options);
-  },
-};
-
-function safeEval(templateSpec) {
-  /* eslint-disable no-eval, no-console */
-  try {
-    return eval('(' + templateSpec + ')');
-  } catch (err) {
-    console.error(templateSpec);
-    throw err;
-  }
-  /* eslint-enable no-eval, no-console */
-}

spec/env/browser.js

@@ -3,9 +3,20 @@ require('./common');
 var fs = require('fs'),
   vm = require('vm');
 
+var chai = require('chai');
+var dirtyChai = require('dirty-chai');
+
+chai.use(dirtyChai);
+global.expect = chai.expect;
+
+global.sinon = require('sinon');
+
 global.Handlebars = 'no-conflict';
 
 var filename = 'dist/handlebars.js';
+if (global.minimizedTest) {
+  filename = 'dist/handlebars.min.js';
+}
 var distHandlebars = fs.readFileSync(
   require.resolve('../../' + filename),
   'utf-8'
@@ -15,13 +26,13 @@ vm.runInThisContext(distHandlebars, filename);
 global.CompilerContext = {
   browser: true,
 
-  compile: function (template, options) {
+  compile: function(template, options) {
     var templateSpec = handlebarsEnv.precompile(template, options);
     return handlebarsEnv.template(safeEval(templateSpec));
   },
-  compileWithPartial: function (template, options) {
+  compileWithPartial: function(template, options) {
     return handlebarsEnv.compile(template, options);
-  },
+  }
 };
 
 function safeEval(templateSpec) {

spec/env/common.js

@@ -1,6 +1,127 @@
-var global = globalThis;
+var global = (function() {
+  return this;
+})();
 
-global.expectTemplate = function (templateAsString) {
+var AssertError;
+if (Error.captureStackTrace) {
+  AssertError = function AssertError(message, caller) {
+    Error.prototype.constructor.call(this, message);
+    this.message = message;
+
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, caller || AssertError);
+    }
+  };
+
+  AssertError.prototype = new Error();
+} else {
+  AssertError = Error;
+}
+
+/**
+ * @deprecated Use "expectTemplate(template)...toCompileTo(output)" instead
+ */
+global.shouldCompileTo = function(string, hashOrArray, expected, message) {
+  shouldCompileToWithPartials(string, hashOrArray, false, expected, message);
+};
+
+/**
+ * @deprecated Use "expectTemplate(template)...toCompileTo(output)" instead
+ */
+global.shouldCompileToWithPartials = function shouldCompileToWithPartials(
+  string,
+  hashOrArray,
+  partials,
+  expected,
+  message
+) {
+  var result = compileWithPartials(string, hashOrArray, partials);
+  if (result !== expected) {
+    throw new AssertError(
+      "'" + result + "' should === '" + expected + "': " + message,
+      shouldCompileToWithPartials
+    );
+  }
+};
+
+/**
+ * @deprecated Use "expectTemplate(template)...toCompileTo(output)" instead
+ */
+global.compileWithPartials = function(string, hashOrArray, partials) {
+  var template, ary, options;
+  if (hashOrArray && hashOrArray.hash) {
+    ary = [hashOrArray.hash, hashOrArray];
+    delete hashOrArray.hash;
+  } else if (Object.prototype.toString.call(hashOrArray) === '[object Array]') {
+    ary = [];
+    ary.push(hashOrArray[0]); // input
+    ary.push({ helpers: hashOrArray[1], partials: hashOrArray[2] });
+    options =
+      typeof hashOrArray[3] === 'object'
+        ? hashOrArray[3]
+        : { compat: hashOrArray[3] };
+    if (hashOrArray[4] != null) {
+      options.data = !!hashOrArray[4];
+      ary[1].data = hashOrArray[4];
+    }
+  } else {
+    ary = [hashOrArray];
+  }
+
+  template = CompilerContext[partials ? 'compileWithPartial' : 'compile'](
+    string,
+    options
+  );
+  return template.apply(this, ary);
+};
+
+/**
+ * @deprecated Use chai's expect-style API instead (`expect(actualValue).to.equal(expectedValue)`)
+ * @see https://www.chaijs.com/api/bdd/
+ */
+global.equals = global.equal = function equals(a, b, msg) {
+  if (a !== b) {
+    throw new AssertError(
+      "'" + a + "' should === '" + b + "'" + (msg ? ': ' + msg : ''),
+      equals
+    );
+  }
+};
+
+/**
+ * @deprecated Use chai's expect-style API instead (`expect(actualValue).to.equal(expectedValue)`)
+ * @see https://www.chaijs.com/api/bdd/#method_throw
+ */
+global.shouldThrow = function(callback, type, msg) {
+  var failed;
+  try {
+    callback();
+    failed = true;
+  } catch (caught) {
+    if (type && !(caught instanceof type)) {
+      throw new AssertError('Type failure: ' + caught);
+    }
+    if (
+      msg &&
+      !(msg.test ? msg.test(caught.message) : msg === caught.message)
+    ) {
+      throw new AssertError(
+        'Throw mismatch: Expected ' +
+          caught.message +
+          ' to match ' +
+          msg +
+          '\n\n' +
+          caught.stack,
+        shouldThrow
+      );
+    }
+  }
+  if (failed) {
+    throw new AssertError('It failed to throw', shouldThrow);
+  }
+};
+
+global.expectTemplate = function(templateAsString) {
   return new HandlebarsTestBench(templateAsString);
 };
 
@@ -16,38 +137,38 @@ function HandlebarsTestBench(templateAsString) {
   this.runtimeOptions = {};
 }
 
-HandlebarsTestBench.prototype.withInput = function (input) {
+HandlebarsTestBench.prototype.withInput = function(input) {
   this.input = input;
   return this;
 };
 
-HandlebarsTestBench.prototype.withHelper = function (name, helperFunction) {
+HandlebarsTestBench.prototype.withHelper = function(name, helperFunction) {
   this.helpers[name] = helperFunction;
   return this;
 };
 
-HandlebarsTestBench.prototype.withHelpers = function (helperFunctions) {
+HandlebarsTestBench.prototype.withHelpers = function(helperFunctions) {
   var self = this;
-  Object.keys(helperFunctions).forEach(function (name) {
+  Object.keys(helperFunctions).forEach(function(name) {
     self.withHelper(name, helperFunctions[name]);
   });
   return this;
 };
 
-HandlebarsTestBench.prototype.withPartial = function (name, partialAsString) {
+HandlebarsTestBench.prototype.withPartial = function(name, partialAsString) {
   this.partials[name] = partialAsString;
   return this;
 };
 
-HandlebarsTestBench.prototype.withPartials = function (partials) {
+HandlebarsTestBench.prototype.withPartials = function(partials) {
   var self = this;
-  Object.keys(partials).forEach(function (name) {
+  Object.keys(partials).forEach(function(name) {
     self.withPartial(name, partials[name]);
   });
   return this;
 };
 
-HandlebarsTestBench.prototype.withDecorator = function (
+HandlebarsTestBench.prototype.withDecorator = function(
   name,
   decoratorFunction
 ) {
@@ -55,56 +176,45 @@ HandlebarsTestBench.prototype.withDecorator = function (
   return this;
 };
 
-HandlebarsTestBench.prototype.withDecorators = function (decorators) {
+HandlebarsTestBench.prototype.withDecorators = function(decorators) {
   var self = this;
-  Object.keys(decorators).forEach(function (name) {
+  Object.keys(decorators).forEach(function(name) {
     self.withDecorator(name, decorators[name]);
   });
   return this;
 };
 
-HandlebarsTestBench.prototype.withCompileOptions = function (compileOptions) {
+HandlebarsTestBench.prototype.withCompileOptions = function(compileOptions) {
   this.compileOptions = compileOptions;
   return this;
 };
 
-HandlebarsTestBench.prototype.withRuntimeOptions = function (runtimeOptions) {
+HandlebarsTestBench.prototype.withRuntimeOptions = function(runtimeOptions) {
   this.runtimeOptions = runtimeOptions;
   return this;
 };
 
-HandlebarsTestBench.prototype.withMessage = function (message) {
+HandlebarsTestBench.prototype.withMessage = function(message) {
   this.message = message;
   return this;
 };
 
-HandlebarsTestBench.prototype.toCompileTo = function (expectedOutputAsString) {
+HandlebarsTestBench.prototype.toCompileTo = function(expectedOutputAsString) {
-  expect(this._compileAndExecute()).toBe(expectedOutputAsString);
+  expect(this._compileAndExecute()).to.equal(
+    expectedOutputAsString,
+    this.message
+  );
 };
 
-HandlebarsTestBench.prototype.toThrow = function (errorLike, errMsgMatcher) {
+// see chai "to.throw" (https://www.chaijs.com/api/bdd/#method_throw)
+HandlebarsTestBench.prototype.toThrow = function(errorLike, errMsgMatcher) {
   var self = this;
-  var caught;
+  expect(function() {
-  try {
     self._compileAndExecute();
-  } catch (e) {
+  }).to.throw(errorLike, errMsgMatcher, this.message);
-    caught = e;
-  }
-
-  expect(caught).toBeDefined();
-
-  if (typeof errorLike === 'function') {
-    expect(caught).toBeInstanceOf(errorLike);
-    if (errMsgMatcher) {
-      expect(caught.message).toMatch(errMsgMatcher);
-    }
-  } else if (errorLike) {
-    // errorLike is a string or regex message matcher (single-argument form)
-    expect(caught.message).toMatch(errorLike);
-  }
 };
 
-HandlebarsTestBench.prototype._compileAndExecute = function () {
+HandlebarsTestBench.prototype._compileAndExecute = function() {
   var compile =
     Object.keys(this.partials).length > 0
       ? CompilerContext.compileWithPartial
@@ -116,10 +226,10 @@ HandlebarsTestBench.prototype._compileAndExecute = function () {
   return template(this.input, combinedRuntimeOptions);
 };
 
-HandlebarsTestBench.prototype._combineRuntimeOptions = function () {
+HandlebarsTestBench.prototype._combineRuntimeOptions = function() {
   var self = this;
   var combinedRuntimeOptions = {};
-  Object.keys(this.runtimeOptions).forEach(function (key) {
+  Object.keys(this.runtimeOptions).forEach(function(key) {
     combinedRuntimeOptions[key] = self.runtimeOptions[key];
   });
   combinedRuntimeOptions.helpers = this.helpers;
@@ -127,7 +237,3 @@ HandlebarsTestBench.prototype._combineRuntimeOptions = function () {
   combinedRuntimeOptions.decorators = this.decorators;
   return combinedRuntimeOptions;
 };
-
-beforeEach(function () {
-  global.handlebarsEnv = Handlebars.create();
-});

spec/env/node.js

@@ -1,15 +1,23 @@
 require('./common');
 
+var chai = require('chai');
+var dirtyChai = require('dirty-chai');
+
+chai.use(dirtyChai);
+global.expect = chai.expect;
+
+global.sinon = require('sinon');
+
 global.Handlebars = require('../../lib');
 
 global.CompilerContext = {
-  compile: function (template, options) {
+  compile: function(template, options) {
     var templateSpec = handlebarsEnv.precompile(template, options);
     return handlebarsEnv.template(safeEval(templateSpec));
   },
-  compileWithPartial: function (template, options) {
+  compileWithPartial: function(template, options) {
     return handlebarsEnv.compile(template, options);
-  },
+  }
 };
 
 function safeEval(templateSpec) {

spec/env/runner.js

@@ -0,0 +1,63 @@
+/* eslint-disable no-console */
+var fs = require('fs'),
+  Mocha = require('mocha'),
+  path = require('path');
+
+var errors = 0,
+  testDir = path.dirname(__dirname),
+  grep = process.argv[2];
+
+// Lazy hack, but whatever
+if (grep === '--min') {
+  global.minimizedTest = true;
+  grep = undefined;
+}
+
+var files = fs
+  .readdirSync(testDir)
+  .filter(function(name) {
+    return /.*\.js$/.test(name);
+  })
+  .map(function(name) {
+    return testDir + path.sep + name;
+  });
+
+if (global.minimizedTest) {
+  run('./runtime', function() {
+    run('./browser', function() {
+      /* eslint-disable no-process-exit */
+      process.exit(errors);
+      /* eslint-enable no-process-exit */
+    });
+  });
+} else {
+  run('./runtime', function() {
+    run('./browser', function() {
+      run('./node', function() {
+        /* eslint-disable no-process-exit */
+        process.exit(errors);
+        /* eslint-enable no-process-exit */
+      });
+    });
+  });
+}
+
+function run(env, callback) {
+  var mocha = new Mocha();
+  mocha.ui('bdd');
+  mocha.files = files.slice();
+  if (grep) {
+    mocha.grep(grep);
+  }
+
+  files.forEach(function(name) {
+    delete require.cache[name];
+  });
+
+  console.log('Running env: ' + env);
+  require(env);
+  mocha.run(function(errorCount) {
+    errors += errorCount;
+    callback();
+  });
+}

spec/env/runtime.js

@@ -0,0 +1,70 @@
+require('./common');
+
+var fs = require('fs'),
+  vm = require('vm');
+
+var chai = require('chai');
+var dirtyChai = require('dirty-chai');
+
+chai.use(dirtyChai);
+global.expect = chai.expect;
+
+global.sinon = require('sinon');
+
+global.Handlebars = 'no-conflict';
+
+var filename = 'dist/handlebars.runtime.js';
+if (global.minimizedTest) {
+  filename = 'dist/handlebars.runtime.min.js';
+}
+vm.runInThisContext(
+  fs.readFileSync(__dirname + '/../../' + filename),
+  filename
+);
+
+var parse = require('../../dist/cjs/handlebars/compiler/base').parse;
+var compiler = require('../../dist/cjs/handlebars/compiler/compiler');
+var JavaScriptCompiler = require('../../dist/cjs/handlebars/compiler/javascript-compiler');
+
+global.CompilerContext = {
+  browser: true,
+
+  compile: function(template, options) {
+    // Hack the compiler on to the environment for these specific tests
+    handlebarsEnv.precompile = function(precompileTemplate, precompileOptions) {
+      return compiler.precompile(
+        precompileTemplate,
+        precompileOptions,
+        handlebarsEnv
+      );
+    };
+    handlebarsEnv.parse = parse;
+    handlebarsEnv.Compiler = compiler.Compiler;
+    handlebarsEnv.JavaScriptCompiler = JavaScriptCompiler;
+
+    var templateSpec = handlebarsEnv.precompile(template, options);
+    return handlebarsEnv.template(safeEval(templateSpec));
+  },
+  compileWithPartial: function(template, options) {
+    // Hack the compiler on to the environment for these specific tests
+    handlebarsEnv.compile = function(compileTemplate, compileOptions) {
+      return compiler.compile(compileTemplate, compileOptions, handlebarsEnv);
+    };
+    handlebarsEnv.parse = parse;
+    handlebarsEnv.Compiler = compiler.Compiler;
+    handlebarsEnv.JavaScriptCompiler = JavaScriptCompiler;
+
+    return handlebarsEnv.compile(template, options);
+  }
+};
+
+function safeEval(templateSpec) {
+  /* eslint-disable no-eval, no-console */
+  try {
+    return eval('(' + templateSpec + ')');
+  } catch (err) {
+    console.error(templateSpec);
+    throw err;
+  }
+  /* eslint-enable no-eval, no-console */
+}

spec/expected/bom.amd.js

@@ -1,6 +1,6 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
     Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-  return templates['bom'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+  return templates["bom"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
       return "a";
   },"useData":true});
   });

spec/expected/empty.amd.js

@@ -1,6 +1,6 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
   Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-return templates['empty'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+return templates["empty"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
     return "";
 },"useData":true});
 });

spec/expected/empty.amd.namespace.js

@@ -1,6 +1,6 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
   Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = CustomNamespace.templates = CustomNamespace.templates || {};
-return templates['empty'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+return templates["empty"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
     return "";
 },"useData":true});
 });

spec/expected/empty.common.js

@@ -1,6 +1,6 @@
 (function() {
   var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-templates['empty'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+templates["empty"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
     return "";
 },"useData":true});
 })();

spec/expected/empty.name.amd.js

@@ -1,9 +1,9 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
   Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-templates['firstTemplate'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+templates["firstTemplate"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
     return "<div>1</div>";
 },"useData":true});
-templates['secondTemplate'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+templates["secondTemplate"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
     return "<div>2</div>";
 },"useData":true});
 return templates;

spec/expected/empty.root.amd.js

@@ -1,6 +1,6 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
   Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-return templates['artifacts/partial.template'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+return templates["artifacts/partial.template"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
     return "<div>Test Partial</div>";
 },"useData":true});
 });

spec/expected/handlebar.path.amd.js

@@ -1,6 +1,6 @@
-define(['some-path/handlebars.runtime'], function(Handlebars) {
+define(["some-path/handlebars.runtime"], function(Handlebars) {
     Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-  return templates['empty'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+  return templates["empty"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
       return "";
   },"useData":true});
   });

spec/expected/help.menu.txt

@@ -1,9 +1,9 @@
 Precompile handlebar templates.
-Usage: handlebars.mjs [template|directory]...
+Usage: handlebars [template|directory]...
 
 Options:
   -f, --output         Output File                                                                              [string]
-      --map            Source Map File                                                                          [string]
+  --map                Source Map File                                                                          [string]
   -a, --amd            Exports amd style (require.js)                                                          [boolean]
   -c, --commonjs       Exports CommonJS style, path to Handlebars module                        [string] [default: null]
   -h, --handlebarPath  Path to handlebar.js (only valid for amd-style)                            [string] [default: ""]
@@ -22,4 +22,4 @@ Options:
   -e, --extension      Template extension.                                              [string] [default: "handlebars"]
   -b, --bom            Removes the BOM (Byte Order Mark) from the beginning of the templates.                  [boolean]
   -v, --version        Prints the current compiler version                                                     [boolean]
-      --help           Outputs this message                                                                    [boolean]
+  --help               Outputs this message                                                                    [boolean]

spec/expected/namespace.amd.js

@@ -1,9 +1,9 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
     Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = someNameSpace = someNameSpace || {};
-  templates['empty'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+  templates["empty"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
       return "";
   },"useData":true});
-  templates['empty'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+  templates["empty"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
       return "";
   },"useData":true});
   return templates;

spec/expected/non.default.extension.amd.js

@@ -1,6 +1,6 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
     Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-  return templates['non.default.extension'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+  return templates["non.default.extension"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
       return "<div>This is a test</div>";
   },"useData":true});
   });

spec/expected/non.empty.amd.known.helper.js

@@ -1,6 +1,6 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
 Handlebars = Handlebars["default"]; var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-return templates['known.helpers'] = template({"0":function(container,depth0,helpers,partials,data) {
+return templates["known.helpers"] = template({"0":function(container,depth0,helpers,partials,data) {
 var stack1, lookupProperty = container.lookupProperty || function(parent, propertyName) {
 if (Object.prototype.hasOwnProperty.call(parent, propertyName)) {
 return parent[propertyName];

spec/expected/partial.template.js

@@ -1,6 +1,6 @@
-define(['handlebars.runtime'], function(Handlebars) {
+define(["handlebars.runtime"], function(Handlebars) {
     Handlebars = Handlebars["default"];  var template = Handlebars.template, templates = Handlebars.templates = Handlebars.templates || {};
-  return Handlebars.partials['partial.template'] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
+  return Handlebars.partials["partial.template"] = template({"compiler":[8,">= 4.3.0"],"main":function(container,depth0,helpers,partials,data) {
       return "<div>Test Partial</div>";
   },"useData":true});
   });

spec/index.html

@@ -1,55 +1,99 @@
 <!doctype html>
 <html>
   <head>
-    <title>Handlebars UMD Smoke Test</title>
+    <title>Mocha</title>
-    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  </head>
-  <body>
-    <h1>Handlebars UMD Smoke Test</h1>
-    <pre id="results"></pre>
-    <script src="/dist/handlebars.js"></script>
-    <script>
-      var results = document.getElementById('results');
-      var failures = 0;
-      var tests = 0;
 
-      function assert(condition, message) {
+    <link rel="stylesheet" href="/node_modules/mocha/mocha.css" />
-        tests++;
+    <style>
-        if (!condition) {
+      .headless .suite > h1,
-          failures++;
+      .headless .test.pass {
-          results.textContent += 'FAIL: ' + message + '\n';
+        display: none;
-        } else {
+      }
-          results.textContent += 'PASS: ' + message + '\n';
+    </style>
+
+    <script>
+      // Show only errors in "headless", non-interactive mode.
+      if (/headless=true/.test(location.href)) {
+        document.documentElement.className = 'headless';
+      }
+    </script>
+    <script src="/node_modules/sinon/pkg/sinon.js"></script>
+    <script src="/node_modules/chai/chai.js"></script>
+    <script src="/node_modules/dirty-chai/lib/dirty-chai.js"></script>
+    <script src="/node_modules/mocha/mocha.js"></script>
+    <script>
+      window.expect = chai.expect;
+      mocha.setup('bdd');
+    </script>
+    <script src="/dist/handlebars.js"></script>
+    <script src="/spec/vendor/json2.js"></script>
+    <script src="/spec/env/common.js"></script>
+    <script>
+      var CompilerContext = {
+        compile: function(template, options) {
+          var templateSpec = handlebarsEnv.precompile(template, options);
+          return handlebarsEnv.template(safeEval(templateSpec));
+        },
+        compileWithPartial: function(template, options) {
+          return handlebarsEnv.compile(template, options);
+        }
+      };
+
+      function safeEval(templateSpec) {
+        try {
+          var ret;
+          eval('ret = ' + templateSpec);
+          return ret;
+        } catch (err) {
+          console.error(templateSpec);
+          throw err;
         }
       }
-
-      try {
-        assert(typeof Handlebars !== 'undefined', 'Handlebars is defined');
-        assert(
-          typeof Handlebars.compile === 'function',
-          'Handlebars.compile exists'
-        );
-        assert(
-          typeof Handlebars.template === 'function',
-          'Handlebars.template exists'
-        );
-        assert(
-          typeof Handlebars.VERSION === 'string',
-          'Handlebars.VERSION exists'
-        );
-
-        var template = Handlebars.compile('Hello {{name}}!');
-        var output = template({ name: 'World' });
-        assert(output === 'Hello World!', 'Basic compilation works: ' + output);
-      } catch (e) {
-        failures++;
-        results.textContent += 'ERROR: ' + e.message + '\n';
-      }
-
-      results.textContent +=
-        '\n' + tests + ' tests, ' + failures + ' failures\n';
-      window.mochaResults = { passes: tests - failures, failures: failures };
     </script>
+    <script src="/tmp/tests.js"></script>
+    <script>
+      onload = function(){
+        mocha.globals(['mochaResults'])
+        // The test harness leaks under FF. We should have decent global leak coverage from other tests
+        if (!navigator.userAgent.match(/Firefox\/([\d.]+)/)) {
+          mocha.checkLeaks();
+        }
+        var runner = mocha.run();
+
+        // Reporting to test-runner
+        var failedTests = [];
+        runner.on('end', function(){
+          window.mochaResults = runner.stats;
+          window.mochaResults.reports = failedTests;
+        });
+
+        runner.on('fail', logFailure);
+
+        function logFailure(test, err){
+
+          var flattenTitles = function(test){
+            var titles = [];
+            while (test.parent.title){
+              titles.push(test.parent.title);
+              test = test.parent;
+            }
+            return titles.reverse();
+          };
+
+          failedTests.push({
+            name: test.title,
+            result: false,
+            message: err.message,
+            stack: err.stack,
+            titles: flattenTitles(test)
+          });
+        };
+      };
+    </script>
+  </head>
+  <body>
+    <div id="mocha"></div>
   </body>
 </html>

spec/javascript-compiler.js

@@ -1,92 +1,87 @@
-describe('javascript-compiler api', function () {
+describe('javascript-compiler api', function() {
   if (!Handlebars.JavaScriptCompiler) {
     return;
   }
 
-  describe('#nameLookup', function () {
+  describe('#nameLookup', function() {
     var $superName;
-    beforeEach(function () {
+    beforeEach(function() {
       $superName = handlebarsEnv.JavaScriptCompiler.prototype.nameLookup;
     });
-    afterEach(function () {
+    afterEach(function() {
       handlebarsEnv.JavaScriptCompiler.prototype.nameLookup = $superName;
     });
 
-    it('should allow override', function () {
+    it('should allow override', function() {
-      handlebarsEnv.JavaScriptCompiler.prototype.nameLookup = function (
+      handlebarsEnv.JavaScriptCompiler.prototype.nameLookup = function(
         parent,
         name
       ) {
         return parent + '.bar_' + name;
       };
+      /* eslint-disable camelcase */
       expectTemplate('{{foo}}')
         .withInput({ bar_foo: 'food' })
         .toCompileTo('food');
+      /* eslint-enable camelcase */
     });
 
     // Tests nameLookup dot vs. bracket behavior.  Bracket is required in certain cases
     // to avoid errors in older browsers.
-    it('should handle reserved words', function () {
+    it('should handle reserved words', function() {
       expectTemplate('{{foo}} {{~null~}}')
         .withInput({ foo: 'food' })
         .toCompileTo('food');
     });
   });
-  // Monkey-patching VM.checkRevision is not possible when VM is an ESM
+  describe('#compilerInfo', function() {
-  // namespace object (browser mode), so skip these tests in that context.
+    var $superCheck, $superInfo;
-  (CompilerContext.browser ? describe.skip : describe)(
+    beforeEach(function() {
-    '#compilerInfo',
+      $superCheck = handlebarsEnv.VM.checkRevision;
-    function () {
+      $superInfo = handlebarsEnv.JavaScriptCompiler.prototype.compilerInfo;
-      var $superCheck, $superInfo;
+    });
-      beforeEach(function () {
+    afterEach(function() {
-        $superCheck = handlebarsEnv.VM.checkRevision;
+      handlebarsEnv.VM.checkRevision = $superCheck;
-        $superInfo = handlebarsEnv.JavaScriptCompiler.prototype.compilerInfo;
+      handlebarsEnv.JavaScriptCompiler.prototype.compilerInfo = $superInfo;
-      });
+    });
-      afterEach(function () {
+    it('should allow compilerInfo override', function() {
-        handlebarsEnv.VM.checkRevision = $superCheck;
+      handlebarsEnv.JavaScriptCompiler.prototype.compilerInfo = function() {
-        handlebarsEnv.JavaScriptCompiler.prototype.compilerInfo = $superInfo;
+        return 'crazy';
-      });
+      };
-      it('should allow compilerInfo override', function () {
+      handlebarsEnv.VM.checkRevision = function(compilerInfo) {
-        handlebarsEnv.JavaScriptCompiler.prototype.compilerInfo = function () {
+        if (compilerInfo !== 'crazy') {
-          return 'crazy';
+          throw new Error("It didn't work");
-        };
+        }
-        handlebarsEnv.VM.checkRevision = function (compilerInfo) {
+      };
-          if (compilerInfo !== 'crazy') {
+      expectTemplate('{{foo}} ')
-            throw new Error("It didn't work");
+        .withInput({ foo: 'food' })
-          }
+        .toCompileTo('food ');
-        };
+    });
-        expectTemplate('{{foo}} ')
+  });
-          .withInput({ foo: 'food' })
+  describe('buffer', function() {
-          .toCompileTo('food ');
-      });
-    }
-  );
-  describe('buffer', function () {
     var $superAppend, $superCreate;
-    beforeEach(function () {
+    beforeEach(function() {
       handlebarsEnv.JavaScriptCompiler.prototype.forceBuffer = true;
       $superAppend = handlebarsEnv.JavaScriptCompiler.prototype.appendToBuffer;
       $superCreate =
         handlebarsEnv.JavaScriptCompiler.prototype.initializeBuffer;
     });
-    afterEach(function () {
+    afterEach(function() {
       handlebarsEnv.JavaScriptCompiler.prototype.forceBuffer = false;
       handlebarsEnv.JavaScriptCompiler.prototype.appendToBuffer = $superAppend;
-      handlebarsEnv.JavaScriptCompiler.prototype.initializeBuffer =
+      handlebarsEnv.JavaScriptCompiler.prototype.initializeBuffer = $superCreate;
-        $superCreate;
     });
 
-    it('should allow init buffer override', function () {
+    it('should allow init buffer override', function() {
-      handlebarsEnv.JavaScriptCompiler.prototype.initializeBuffer =
+      handlebarsEnv.JavaScriptCompiler.prototype.initializeBuffer = function() {
-        function () {
+        return this.quotedString('foo_');
-          return this.quotedString('foo_');
+      };
-        };
       expectTemplate('{{foo}} ')
         .withInput({ foo: 'food' })
         .toCompileTo('foo_food ');
     });
-    it('should allow append buffer override', function () {
+    it('should allow append buffer override', function() {
-      handlebarsEnv.JavaScriptCompiler.prototype.appendToBuffer = function (
+      handlebarsEnv.JavaScriptCompiler.prototype.appendToBuffer = function(
         string
       ) {
         return $superAppend.call(this, [string, ' + "_foo"']);
@@ -97,27 +92,27 @@ describe('javascript-compiler api', function () {
     });
   });
 
-  describe('#isValidJavaScriptVariableName', function () {
+  describe('#isValidJavaScriptVariableName', function() {
     // It is there and accessible and could be used by someone. That's why we don't remove it
     // it 4.x. But if we keep it, we add a test
     // This test should not encourage you to use the function. It is not needed any more
     // and might be removed in 5.0
-    ['test', 'abc123', 'abc_123'].forEach(function (validVariableName) {
+    ['test', 'abc123', 'abc_123'].forEach(function(validVariableName) {
-      it("should return true for '" + validVariableName + "'", function () {
+      it("should return true for '" + validVariableName + "'", function() {
         expect(
           handlebarsEnv.JavaScriptCompiler.isValidJavaScriptVariableName(
             validVariableName
           )
-        ).toBe(true);
+        ).to.be.true();
       });
     });
-    [('123test', 'abc()', 'abc.cde')].forEach(function (invalidVariableName) {
+    [('123test', 'abc()', 'abc.cde')].forEach(function(invalidVariableName) {
-      it("should return true for '" + invalidVariableName + "'", function () {
+      it("should return true for '" + invalidVariableName + "'", function() {
         expect(
           handlebarsEnv.JavaScriptCompiler.isValidJavaScriptVariableName(
             invalidVariableName
           )
-        ).toBe(false);
+        ).to.be.false();
       });
     });
   });

spec/parser.js

@@ -0,0 +1,455 @@
+describe('parser', function() {
+  if (!Handlebars.print) {
+    return;
+  }
+
+  function astFor(template) {
+    var ast = Handlebars.parse(template);
+    return Handlebars.print(ast);
+  }
+
+  it('parses simple mustaches', function() {
+    equals(astFor('{{123}}'), '{{ NUMBER{123} [] }}\n');
+    equals(astFor('{{"foo"}}'), '{{ "foo" [] }}\n');
+    equals(astFor('{{false}}'), '{{ BOOLEAN{false} [] }}\n');
+    equals(astFor('{{true}}'), '{{ BOOLEAN{true} [] }}\n');
+    equals(astFor('{{foo}}'), '{{ PATH:foo [] }}\n');
+    equals(astFor('{{foo?}}'), '{{ PATH:foo? [] }}\n');
+    equals(astFor('{{foo_}}'), '{{ PATH:foo_ [] }}\n');
+    equals(astFor('{{foo-}}'), '{{ PATH:foo- [] }}\n');
+    equals(astFor('{{foo:}}'), '{{ PATH:foo: [] }}\n');
+  });
+
+  it('parses simple mustaches with data', function() {
+    equals(astFor('{{@foo}}'), '{{ @PATH:foo [] }}\n');
+  });
+
+  it('parses simple mustaches with data paths', function() {
+    equals(astFor('{{@../foo}}'), '{{ @PATH:foo [] }}\n');
+  });
+
+  it('parses mustaches with paths', function() {
+    equals(astFor('{{foo/bar}}'), '{{ PATH:foo/bar [] }}\n');
+  });
+
+  it('parses mustaches with this/foo', function() {
+    equals(astFor('{{this/foo}}'), '{{ PATH:foo [] }}\n');
+  });
+
+  it('parses mustaches with - in a path', function() {
+    equals(astFor('{{foo-bar}}'), '{{ PATH:foo-bar [] }}\n');
+  });
+  it('parses mustaches with escaped [] in a path', function() {
+    equals(astFor('{{[foo[\\]]}}'), '{{ PATH:foo[] [] }}\n');
+  });
+  it('parses escaped \\\\ in path', function() {
+    equals(astFor('{{[foo\\\\]}}'), '{{ PATH:foo\\ [] }}\n');
+  });
+
+  it('parses mustaches with parameters', function() {
+    equals(astFor('{{foo bar}}'), '{{ PATH:foo [PATH:bar] }}\n');
+  });
+
+  it('parses mustaches with string parameters', function() {
+    equals(astFor('{{foo bar "baz" }}'), '{{ PATH:foo [PATH:bar, "baz"] }}\n');
+  });
+
+  it('parses mustaches with NUMBER parameters', function() {
+    equals(astFor('{{foo 1}}'), '{{ PATH:foo [NUMBER{1}] }}\n');
+  });
+
+  it('parses mustaches with BOOLEAN parameters', function() {
+    equals(astFor('{{foo true}}'), '{{ PATH:foo [BOOLEAN{true}] }}\n');
+    equals(astFor('{{foo false}}'), '{{ PATH:foo [BOOLEAN{false}] }}\n');
+  });
+
+  it('parses mustaches with undefined and null paths', function() {
+    equals(astFor('{{undefined}}'), '{{ UNDEFINED [] }}\n');
+    equals(astFor('{{null}}'), '{{ NULL [] }}\n');
+  });
+  it('parses mustaches with undefined and null parameters', function() {
+    equals(
+      astFor('{{foo undefined null}}'),
+      '{{ PATH:foo [UNDEFINED, NULL] }}\n'
+    );
+  });
+
+  it('parses mustaches with DATA parameters', function() {
+    equals(astFor('{{foo @bar}}'), '{{ PATH:foo [@PATH:bar] }}\n');
+  });
+
+  it('parses mustaches with hash arguments', function() {
+    equals(astFor('{{foo bar=baz}}'), '{{ PATH:foo [] HASH{bar=PATH:baz} }}\n');
+    equals(astFor('{{foo bar=1}}'), '{{ PATH:foo [] HASH{bar=NUMBER{1}} }}\n');
+    equals(
+      astFor('{{foo bar=true}}'),
+      '{{ PATH:foo [] HASH{bar=BOOLEAN{true}} }}\n'
+    );
+    equals(
+      astFor('{{foo bar=false}}'),
+      '{{ PATH:foo [] HASH{bar=BOOLEAN{false}} }}\n'
+    );
+    equals(
+      astFor('{{foo bar=@baz}}'),
+      '{{ PATH:foo [] HASH{bar=@PATH:baz} }}\n'
+    );
+
+    equals(
+      astFor('{{foo bar=baz bat=bam}}'),
+      '{{ PATH:foo [] HASH{bar=PATH:baz, bat=PATH:bam} }}\n'
+    );
+    equals(
+      astFor('{{foo bar=baz bat="bam"}}'),
+      '{{ PATH:foo [] HASH{bar=PATH:baz, bat="bam"} }}\n'
+    );
+
+    equals(astFor("{{foo bat='bam'}}"), '{{ PATH:foo [] HASH{bat="bam"} }}\n');
+
+    equals(
+      astFor('{{foo omg bar=baz bat="bam"}}'),
+      '{{ PATH:foo [PATH:omg] HASH{bar=PATH:baz, bat="bam"} }}\n'
+    );
+    equals(
+      astFor('{{foo omg bar=baz bat="bam" baz=1}}'),
+      '{{ PATH:foo [PATH:omg] HASH{bar=PATH:baz, bat="bam", baz=NUMBER{1}} }}\n'
+    );
+    equals(
+      astFor('{{foo omg bar=baz bat="bam" baz=true}}'),
+      '{{ PATH:foo [PATH:omg] HASH{bar=PATH:baz, bat="bam", baz=BOOLEAN{true}} }}\n'
+    );
+    equals(
+      astFor('{{foo omg bar=baz bat="bam" baz=false}}'),
+      '{{ PATH:foo [PATH:omg] HASH{bar=PATH:baz, bat="bam", baz=BOOLEAN{false}} }}\n'
+    );
+  });
+
+  it('parses contents followed by a mustache', function() {
+    equals(
+      astFor('foo bar {{baz}}'),
+      "CONTENT[ 'foo bar ' ]\n{{ PATH:baz [] }}\n"
+    );
+  });
+
+  it('parses a partial', function() {
+    equals(astFor('{{> foo }}'), '{{> PARTIAL:foo }}\n');
+    equals(astFor('{{> "foo" }}'), '{{> PARTIAL:foo }}\n');
+    equals(astFor('{{> 1 }}'), '{{> PARTIAL:1 }}\n');
+  });
+
+  it('parses a partial with context', function() {
+    equals(astFor('{{> foo bar}}'), '{{> PARTIAL:foo PATH:bar }}\n');
+  });
+
+  it('parses a partial with hash', function() {
+    equals(
+      astFor('{{> foo bar=bat}}'),
+      '{{> PARTIAL:foo HASH{bar=PATH:bat} }}\n'
+    );
+  });
+
+  it('parses a partial with context and hash', function() {
+    equals(
+      astFor('{{> foo bar bat=baz}}'),
+      '{{> PARTIAL:foo PATH:bar HASH{bat=PATH:baz} }}\n'
+    );
+  });
+
+  it('parses a partial with a complex name', function() {
+    equals(
+      astFor('{{> shared/partial?.bar}}'),
+      '{{> PARTIAL:shared/partial?.bar }}\n'
+    );
+  });
+
+  it('parsers partial blocks', function() {
+    equals(
+      astFor('{{#> foo}}bar{{/foo}}'),
+      "{{> PARTIAL BLOCK:foo PROGRAM:\n  CONTENT[ 'bar' ]\n }}\n"
+    );
+  });
+  it('should handle parser block mismatch', function() {
+    shouldThrow(
+      function() {
+        astFor('{{#> goodbyes}}{{/hellos}}');
+      },
+      Error,
+      /goodbyes doesn't match hellos/
+    );
+  });
+  it('parsers partial blocks with arguments', function() {
+    equals(
+      astFor('{{#> foo context hash=value}}bar{{/foo}}'),
+      "{{> PARTIAL BLOCK:foo PATH:context HASH{hash=PATH:value} PROGRAM:\n  CONTENT[ 'bar' ]\n }}\n"
+    );
+  });
+
+  it('parses a comment', function() {
+    equals(
+      astFor('{{! this is a comment }}'),
+      "{{! ' this is a comment ' }}\n"
+    );
+  });
+
+  it('parses a multi-line comment', function() {
+    equals(
+      astFor('{{!\nthis is a multi-line comment\n}}'),
+      "{{! '\nthis is a multi-line comment\n' }}\n"
+    );
+  });
+
+  it('parses an inverse section', function() {
+    equals(
+      astFor('{{#foo}} bar {{^}} baz {{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n    CONTENT[ ' bar ' ]\n  {{^}}\n    CONTENT[ ' baz ' ]\n"
+    );
+  });
+
+  it('parses an inverse (else-style) section', function() {
+    equals(
+      astFor('{{#foo}} bar {{else}} baz {{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n    CONTENT[ ' bar ' ]\n  {{^}}\n    CONTENT[ ' baz ' ]\n"
+    );
+  });
+
+  it('parses multiple inverse sections', function() {
+    equals(
+      astFor('{{#foo}} bar {{else if bar}}{{else}} baz {{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n    CONTENT[ ' bar ' ]\n  {{^}}\n    BLOCK:\n      PATH:if [PATH:bar]\n      PROGRAM:\n      {{^}}\n        CONTENT[ ' baz ' ]\n"
+    );
+  });
+
+  it('parses empty blocks', function() {
+    equals(astFor('{{#foo}}{{/foo}}'), 'BLOCK:\n  PATH:foo []\n  PROGRAM:\n');
+  });
+
+  it('parses empty blocks with empty inverse section', function() {
+    equals(
+      astFor('{{#foo}}{{^}}{{/foo}}'),
+      'BLOCK:\n  PATH:foo []\n  PROGRAM:\n  {{^}}\n'
+    );
+  });
+
+  it('parses empty blocks with empty inverse (else-style) section', function() {
+    equals(
+      astFor('{{#foo}}{{else}}{{/foo}}'),
+      'BLOCK:\n  PATH:foo []\n  PROGRAM:\n  {{^}}\n'
+    );
+  });
+
+  it('parses non-empty blocks with empty inverse section', function() {
+    equals(
+      astFor('{{#foo}} bar {{^}}{{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n    CONTENT[ ' bar ' ]\n  {{^}}\n"
+    );
+  });
+
+  it('parses non-empty blocks with empty inverse (else-style) section', function() {
+    equals(
+      astFor('{{#foo}} bar {{else}}{{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n    CONTENT[ ' bar ' ]\n  {{^}}\n"
+    );
+  });
+
+  it('parses empty blocks with non-empty inverse section', function() {
+    equals(
+      astFor('{{#foo}}{{^}} bar {{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n  {{^}}\n    CONTENT[ ' bar ' ]\n"
+    );
+  });
+
+  it('parses empty blocks with non-empty inverse (else-style) section', function() {
+    equals(
+      astFor('{{#foo}}{{else}} bar {{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n  {{^}}\n    CONTENT[ ' bar ' ]\n"
+    );
+  });
+
+  it('parses a standalone inverse section', function() {
+    equals(
+      astFor('{{^foo}}bar{{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  {{^}}\n    CONTENT[ 'bar' ]\n"
+    );
+  });
+  it('throws on old inverse section', function() {
+    shouldThrow(function() {
+      astFor('{{else foo}}bar{{/foo}}');
+    }, Error);
+  });
+
+  it('parses block with block params', function() {
+    equals(
+      astFor('{{#foo as |bar baz|}}content{{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n    BLOCK PARAMS: [ bar baz ]\n    CONTENT[ 'content' ]\n"
+    );
+  });
+
+  it('parses inverse block with block params', function() {
+    equals(
+      astFor('{{^foo as |bar baz|}}content{{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  {{^}}\n    BLOCK PARAMS: [ bar baz ]\n    CONTENT[ 'content' ]\n"
+    );
+  });
+  it('parses chained inverse block with block params', function() {
+    equals(
+      astFor('{{#foo}}{{else foo as |bar baz|}}content{{/foo}}'),
+      "BLOCK:\n  PATH:foo []\n  PROGRAM:\n  {{^}}\n    BLOCK:\n      PATH:foo []\n      PROGRAM:\n        BLOCK PARAMS: [ bar baz ]\n        CONTENT[ 'content' ]\n"
+    );
+  });
+  it("raises if there's a Parse error", function() {
+    shouldThrow(
+      function() {
+        astFor('foo{{^}}bar');
+      },
+      Error,
+      /Parse error on line 1/
+    );
+    shouldThrow(
+      function() {
+        astFor('{{foo}');
+      },
+      Error,
+      /Parse error on line 1/
+    );
+    shouldThrow(
+      function() {
+        astFor('{{foo &}}');
+      },
+      Error,
+      /Parse error on line 1/
+    );
+    shouldThrow(
+      function() {
+        astFor('{{#goodbyes}}{{/hellos}}');
+      },
+      Error,
+      /goodbyes doesn't match hellos/
+    );
+
+    shouldThrow(
+      function() {
+        astFor('{{{{goodbyes}}}} {{{{/hellos}}}}');
+      },
+      Error,
+      /goodbyes doesn't match hellos/
+    );
+  });
+
+  it('should handle invalid paths', function() {
+    shouldThrow(
+      function() {
+        astFor('{{foo/../bar}}');
+      },
+      Error,
+      /Invalid path: foo\/\.\. - 1:2/
+    );
+    shouldThrow(
+      function() {
+        astFor('{{foo/./bar}}');
+      },
+      Error,
+      /Invalid path: foo\/\. - 1:2/
+    );
+    shouldThrow(
+      function() {
+        astFor('{{foo/this/bar}}');
+      },
+      Error,
+      /Invalid path: foo\/this - 1:2/
+    );
+  });
+
+  it('knows how to report the correct line number in errors', function() {
+    shouldThrow(
+      function() {
+        astFor('hello\nmy\n{{foo}');
+      },
+      Error,
+      /Parse error on line 3/
+    );
+    shouldThrow(
+      function() {
+        astFor('hello\n\nmy\n\n{{foo}');
+      },
+      Error,
+      /Parse error on line 5/
+    );
+  });
+
+  it('knows how to report the correct line number in errors when the first character is a newline', function() {
+    shouldThrow(
+      function() {
+        astFor('\n\nhello\n\nmy\n\n{{foo}');
+      },
+      Error,
+      /Parse error on line 7/
+    );
+  });
+
+  describe('externally compiled AST', function() {
+    it('can pass through an already-compiled AST', function() {
+      equals(
+        astFor({
+          type: 'Program',
+          body: [{ type: 'ContentStatement', value: 'Hello' }]
+        }),
+        "CONTENT[ 'Hello' ]\n"
+      );
+    });
+  });
+
+  describe('directives', function() {
+    it('should parse block directives', function() {
+      equals(
+        astFor('{{#* foo}}{{/foo}}'),
+        'DIRECTIVE BLOCK:\n  PATH:foo []\n  PROGRAM:\n'
+      );
+    });
+    it('should parse directives', function() {
+      equals(astFor('{{* foo}}'), '{{ DIRECTIVE PATH:foo [] }}\n');
+    });
+    it('should fail if directives have inverse', function() {
+      shouldThrow(
+        function() {
+          astFor('{{#* foo}}{{^}}{{/foo}}');
+        },
+        Error,
+        /Unexpected inverse/
+      );
+    });
+  });
+
+  it('GH1024 - should track program location properly', function() {
+    var p = Handlebars.parse(
+      '\n' +
+        '  {{#if foo}}\n' +
+        '    {{bar}}\n' +
+        '       {{else}}    {{baz}}\n' +
+        '\n' +
+        '     {{/if}}\n' +
+        '    '
+    );
+
+    // We really need a deep equals but for now this should be stable...
+    equals(
+      JSON.stringify(p.loc),
+      JSON.stringify({
+        start: { line: 1, column: 0 },
+        end: { line: 7, column: 4 }
+      })
+    );
+    equals(
+      JSON.stringify(p.body[1].program.loc),
+      JSON.stringify({
+        start: { line: 2, column: 13 },
+        end: { line: 4, column: 7 }
+      })
+    );
+    equals(
+      JSON.stringify(p.body[1].inverse.loc),
+      JSON.stringify({
+        start: { line: 4, column: 15 },
+        end: { line: 6, column: 5 }
+      })
+    );
+  });
+});