wip: only run "require"-test, if "require-extensions" exists

"require" does not mean "amd" in this case...
wip
2020-06-02 00:11:10 +02:00 · 2020-06-02 00:10:37 +02:00 · 2020-06-01 22:28:13 +02:00 · 2020-05-31 23:38:23 +02:00 · 2020-05-05 00:04:33 +02:00 · 2020-04-03 20:05:19 +01:00
169 changed files with 14469 additions and 12547 deletions
@@ -0,0 +1,25 @@
+.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/
+/integration-testing/*/dist/
+
+# Third-party or files that must remain unchanged
+/spec/expected/
+/spec/vendor
+
+# JS-Snippets
+src/*.js
@@ -1,117 +1,66 @@
 module.exports = {
-  "extends": ["eslint:recommended","plugin:compat/recommended"],
-  "globals": {
-    "self": false
+  extends: ['eslint:recommended', 'plugin:compat/recommended', 'prettier'],
+  globals: {
+    self: false
  },
-  "env": {
-    "node": true,
-    "es6": true
+  env: {
+    node: true,
+    es6: true
  },
-  "rules": {
-    // overrides eslint:recommended defaults
-    "no-sparse-arrays": "off",
-    "no-func-assign": "off",
-    "no-console": "warn",
-    "no-debugger": "warn",
-    "no-unreachable": "warn",
-
-    // Possible Errors //
-    //-----------------//
-    "no-unsafe-negation": "error",
+  rules: {
+    'no-console': 'warn',

+    // temporarily disabled until the violating places are fixed.
+    'no-func-assign': 'off',
+    'no-sparse-arrays': 'off',

    // Best Practices //
    //----------------//
-    "curly": "error",
-    "default-case": "warn",
-    "dot-notation": ["error", { "allowKeywords": false }],
-    "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-spaces": "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",
-    "wrap-iife": "error",
-
+    '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-catch-shadow": "error",
-    "no-label-var": "error",
-    "no-shadow-restricted-names": "error",
-    "no-undef-init": "error",
-    "no-use-before-define": ["error", "nofunc"],
-
-
-    // Stylistic Issues //
-    //------------------//
-    "comma-dangle": ["error", "never"],
-    "quote-props": ["error", "as-needed", { "keywords": true, "unnecessary": false }],
-    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
-    "camelcase": "error",
-    "comma-spacing": ["error", { "before": false, "after": true }],
-    "comma-style": ["error", "last"],
-    "consistent-this": ["warn", "self"],
-    "eol-last": "error",
-    "func-style": ["error", "declaration"],
-    "key-spacing": ["error", {
-      "beforeColon": false,
-      "afterColon": true
-    }],
-    "new-cap": "error",
-    "new-parens": "error",
-    "no-array-constructor": "error",
-    "no-lonely-if": "error",
-    "no-mixed-spaces-and-tabs": "error",
-    "no-nested-ternary": "warn",
-    "no-new-object": "error",
-    "no-spaced-func": "error",
-    "no-trailing-spaces": "error",
-    "no-extra-parens": ["error", "functions"],
-    "quotes": ["error", "single", "avoid-escape"],
-    "semi": "error",
-    "semi-spacing": ["error", { "before": false, "after": true }],
-    "keyword-spacing": "error",
-    "space-before-blocks": ["error", "always"],
-    "space-before-function-paren": ["error", { "anonymous": "never", "named": "never" }],
-    "space-in-parens": ["error", "never"],
-    "space-infix-ops": "error",
-    "space-unary-ops": "error",
-    "spaced-comment": ["error", "always", { "markers": [","] }],
-    "wrap-regex": "warn",
+    'no-label-var': 'error',
+    'no-undef-init': 'error',
+    'no-use-before-define': ['error', 'nofunc'],

    // ECMAScript 6 //
    //--------------//
-    "no-var": "warn"
+    'no-var': 'error'
  },
-  "parserOptions": {
-    "sourceType": "module",
-    "ecmaVersion": 6,
-    "ecmaFeatures": {}
+  parserOptions: {
+    sourceType: 'module',
+    ecmaVersion: 2018,
+    ecmaFeatures: {}
  }
-}
+};
@@ -1,15 +1,20 @@
-vendor
 .rvmrc
 .DS_Store
-lib/handlebars/compiler/parser.js
-/dist/
 /tmp/
-/coverage/
-node_modules
 *.sublime-project
 *.sublime-workspace
 npm-debug.log
 sauce_connect.log*
 .idea
-yarn-error.log
+/yarn-error.log
+/yarn.lock
+node_modules
 /handlebars-release.tgz
+.nyc_output
+
+# Generated files
+lib/handlebars/compiler/parser.js
+/coverage/
+/dist/
+/integration-testing/*/dist/
+/spec/tmp/*
@@ -1,2 +0,0 @@
-instrumentation:
-    excludes: ['**/spec/**', '**/handlebars/compiler/parser.js']
@@ -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/
+/integration-testing/*/dist/
+
+# Third-party or files that must remain unchanged
+/spec/expected/
+/spec/vendor
@@ -1,26 +1,39 @@
 language: node_js
-before_install:
- npm install -g grunt-cli
-script:
- grunt --stack travis
+jobs:
+  include:
+  - stage: test
+    name: check javascript (eslint)
+    node_js: lts/*
+    script: npm run lint
+  - stage: test
+    name: check formatting (prettier)
+    node_js: lts/*
+    script: npm run check-format
+  - stage: test
+    name: check typescript definitions (dtslint)
+    node_js: lts/*
+    script: npm run dtslint
+  - stage: test
+    name: extensive tests and publish to aws
+    script: npm run extensive-tests-and-publish-to-aws
+    env:
+    - S3_BUCKET_NAME=builds.handlebarsjs.com
+    - secure: ckyEe5dzjdFDjmZ6wIrhGm0CFBEnKq8c1dYptfgVV/Q5/nJFGzu8T0yTjouS/ERxzdT2H327/63VCxhFnLCRHrsh4rlW/rCy4XI3O/0TeMLgFPa4TXkO8359qZ4CB44TBb3NsJyQXNMYdJpPLTCVTMpuiqqkFFOr+6OeggR7ufA=
+    - secure: Nm4AgSfsgNB21kgKrF9Tl7qVZU8YYREhouQunFracTcZZh2NZ2XH5aHuSiXCj88B13Cr/jGbJKsZ4T3QS3wWYtz6lkyVOx3H3iI+TMtqhD9RM3a7A4O+4vVN8IioB2YjhEu0OKjwgX5gp+0uF+pLEi7Hpj6fupD3AbbL5uYcKg8=
+    - SAUCE_USERNAME=handlebars
+    - secure: 1VkLQhbsEug4ZMQ52tTOus/WLvW3Etqe7GbCzZfzsI8d2ygJPjFfzU8fNm4pVVwoTI21MaM5AQq7SVPu8DWN1YbDjJycMdY1zO3DsB9aZBxTal98fIB7ZIUce9r5z2EP6mETrsbYjZkeckzIBI0A4UVa+F2BO4KbRDXP1Db3u3I=
+    node_js: '10'
+  - stage: test
+    name: test with latest nodejs-lts
+    node_js: lts/*
+    script: npm run test
+  - stage: test
+    name: test with active nodejs
+    node_js: node
+    script: npm run test
+cache: npm
 email:
  on_failure: change
  on_success: never
-env:
-  global:
-  - S3_BUCKET_NAME=builds.handlebarsjs.com
-  - secure: ckyEe5dzjdFDjmZ6wIrhGm0CFBEnKq8c1dYptfgVV/Q5/nJFGzu8T0yTjouS/ERxzdT2H327/63VCxhFnLCRHrsh4rlW/rCy4XI3O/0TeMLgFPa4TXkO8359qZ4CB44TBb3NsJyQXNMYdJpPLTCVTMpuiqqkFFOr+6OeggR7ufA=
-  - secure: Nm4AgSfsgNB21kgKrF9Tl7qVZU8YYREhouQunFracTcZZh2NZ2XH5aHuSiXCj88B13Cr/jGbJKsZ4T3QS3wWYtz6lkyVOx3H3iI+TMtqhD9RM3a7A4O+4vVN8IioB2YjhEu0OKjwgX5gp+0uF+pLEi7Hpj6fupD3AbbL5uYcKg8=
-matrix:
-  include:
-  - node_js: '10'
-    env:
-    - PUBLISH=true
-    - secure: pLTzghtVll9yGKJI0AaB0uI8GypfWxLTaIB0ZL8//yN3nAEIKMhf/RRilYTsn/rKj2NUa7vt2edYILi3lttOUlCBOwTc9amiRms1W8Lwr/3IdWPeBLvLuH1zNJRm2lBAwU4LBSqaOwhGaxOQr6KHTnWudhNhgOucxpZfvfI/dFw=
-    - secure: yERYCf7AwL11D9uMtacly/THGV8BlzsMmrt+iQVvGA3GaY6QMmfYqf6P6cCH98sH5etd1Y+1e6YrPeMjqI6lyRllT7FptoyOdHulazQe86VQN4sc0EpqMlH088kB7gGjTut9Z+X9ViooT5XEh9WA5jXEI9pXhQJNoIHkWPuwGuY=
-cache:
-  directories:
-  - node_modules
-
 git:
  depth: 100
@@ -12,8 +12,8 @@ Documentation issues on the handlebarsjs.com site should be reported on [handleb

 ## Branches

-* The branch `4.x` contains the currently released version. Bugfixes should be made in this branch.
-* The branch `master` contains the next version. A release date is not yet specified. Maintainers
+- The branch `4.x` contains the currently released version. Bugfixes should be made in this branch.
+- 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
@@ -21,6 +21,7 @@ Documentation issues on the handlebarsjs.com site should be reported on [handleb
 We also accept [pull requests][pull-request]!

 Generally we like to see pull requests that
+
 - 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](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
@@ -31,8 +32,8 @@ Generally we like to see pull requests that

 To build Handlebars.js you'll need a few things installed.

-* Node.js
-* [Grunt](http://gruntjs.com/getting-started)
+- 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`.

@@ -51,11 +52,13 @@ If you notice any problems, please report them to the GitHub issue tracker at
 ##Running Tests

 To run tests locally, first install all dependencies.
+
 ```sh
 npm install
 ```

 Clone the mustache specs into the spec/mustache folder.
+
 ```sh
 cd spec
 rm -r mustache
@@ -63,27 +66,40 @@ git clone https://github.com/mustache/spec.git mustache
 ```

 From the root directory, run the tests.
+
 ```sh
 npm test
 ```

-## Ember testing
+## Linting and Formatting

-The current ember distribution should be tested as part of the handlebars release process. This requires building the `handlebars-source` gem locally and then executing the ember test script.
+Handlebars uses `eslint` to enforce best-practices and `prettier` to auto-format files.
+We do linting and formatting in two phases:

-```sh
-npm link
-grunt build release
-cp dist/*.js $emberRepoDir/bower_components/handlebars/
+- Committed files are linted and formatted in a pre-commit hook. In this stage eslint-errors are forbidden,
+  while warnings are allowed.
+- The travis-ci job also lints all files and checks if they are formatted correctly. In this stage, warnings
+  are forbidden.

-cd $emberRepoDir
-npm link handlebars
-npm test
-```
+You can use the following scripts to make sure that the travis-job does not fail:
+
+- **npm run lint** will run `eslint` and fail on warnings
+- **npm run format** will run `prettier` on all files
+- **npm run check-before-pull-request** will perform all most checks that travis does in its build-job, excluding the "integration-test".
+- **npm run integration-test** will run integration tests (using old NodeJS versions and integrations with webpack, babel and so on)
+  These tests only work on a Linux-machine with `nvm` installed (for running tests in multiple versions of NodeJS).

 ## Releasing the latest version

-*When releasing a previous version of Handlebars, please look into the CONTRIBUNG.md in the corresponding branch.*
+Before attempting the release Handlebars, please make sure that you have the following authorizations:
+
+- Push-access to `wycats/handlebars.js`
+- Publishing rights on npmjs.com for the `handlebars` package
+- Publishing rights on gemfury for the `handlebars-source` package
+- Push-access to the repo for legacy package managers: `components/handlebars`
+- Push-access to the production-repo of the handlebars site: `handlebars-lang/handlebarsjs.com-github-pages`
+
+_When releasing a previous version of Handlebars, please look into the CONTRIBUNG.md in the corresponding branch._

 Handlebars utilizes the [release yeoman generator][generator-release] to perform most release tasks.

@@ -103,12 +119,18 @@ gem push handlebars-source-*.gem
 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

-* [The npm-package](https://www.npmjs.com/package/handlebars) (check latest-tag)
-* [The bower package](https://github.com/components/handlebars.js) (check the package.json)
-* [The AWS S3 Bucket](https://s3.amazonaws.com/builds.handlebarsjs.com) (check latest-tag)
-* [RubyGems](https://rubygems.org/gems/handlebars-source)
+- [The npm-package](https://www.npmjs.com/package/handlebars) (check latest-tag)
+- [The bower package](https://github.com/components/handlebars.js) (check the package.json)
+- [The AWS S3 Bucket](https://s3.amazonaws.com/builds.handlebarsjs.com) (check latest-tag)
+- [RubyGems](https://rubygems.org/gems/handlebars-source)

-When everything is OK, the handlebars site needs to be updated to point to the new version numbers. The jsfiddle link should be updated to point to the most recent distribution for all instances in our documentation.
+When everything is OK, the **handlebars site** needs to be updated.
+
+Go to the master branch of the repo [handlebars-lang/handlebarsjs.com-github-pages](https://github.com/handlebars-lang/handlebarsjs.com-github-pages/tree/master)
+and make a minimal change to the README. This will invoke a github-action that redeploys
+the site, fetching the latest version-number from the npm-registry.
+(note that the default-branch of this repo is not the master and regular changes are done
+in the `handlebars-lang/docs`-repo).

 [generator-release]: https://github.com/walmartlabs/generator-release
 [pull-request]: https://github.com/wycats/handlebars.js/pull/new/master
@@ -1,45 +1,42 @@
 /* eslint-disable no-process-env */
 module.exports = function(grunt) {
-
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),

-    eslint: {
-      files: [
-        '*.js',
-        'bench/**/*.js',
-        'tasks/**/*.js',
-        'lib/**/!(*.min|parser).js',
-        'spec/**/!(*.amd|json2|require).js',
-        'integration-testing/multi-nodejs-test/*.js',
-        'integration-testing/webpack-test/*.js',
-        'integration-testing/webpack-test/src/*.js'
-      ]
-    },
-
-    clean: ['tmp', 'dist', 'lib/handlebars/compiler/parser.js', 'integration-testing/**/node_modules'],
+    clean: [
+      'tmp',
+      'dist',
+      'lib/handlebars/compiler/parser.js',
+      'integration-testing/**/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;
+            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/'}
-        ]
+        files: [{ expand: true, cwd: 'dist/', src: ['*.js'], dest: 'dist/' }]
      },
      cdnjs: {
        files: [
-          {expand: true, cwd: 'dist/', src: ['*.js'], dest: 'dist/cdnjs'}
+          { 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'}
+          {
+            expand: true,
+            cwd: 'components/',
+            src: ['**'],
+            dest: 'dist/components'
+          },
+          { expand: true, cwd: 'dist/', src: ['*.js'], dest: 'dist/components' }
        ]
      }
    },
@@ -54,24 +51,28 @@ module.exports = function(grunt) {
        options: {
          modules: 'amd'
        },
-        files: [{
-          expand: true,
-          cwd: 'lib/',
-          src: '**/!(index).js',
-          dest: 'dist/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/'
-        }]
+        files: [
+          {
+            cwd: 'lib/',
+            expand: true,
+            src: '**/!(index).js',
+            dest: 'dist/cjs/'
+          }
+        ]
      }
    },
    webpack: {
@@ -80,7 +81,12 @@ module.exports = function(grunt) {
        module: {
          loaders: [
            // the optional 'runtime' transformer tells babel to require the runtime instead of inlining it.
-            { test: /\.jsx?$/, exclude: /node_modules/, loader: 'babel-loader?optional=runtime&loose=es6.modules&auxiliaryCommentBefore=istanbul%20ignore%20next' }
+            {
+              test: /\.jsx?$/,
+              exclude: /node_modules/,
+              loader:
+                'babel-loader?optional=runtime&loose=es6.modules&auxiliaryCommentBefore=istanbul%20ignore%20next'
+            }
          ]
        },
        output: {
@@ -129,15 +135,17 @@ module.exports = function(grunt) {
        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$/, '.min.js');
+        files: [
+          {
+            cwd: 'dist/',
+            expand: true,
+            src: ['handlebars*.js', '!*.min.js'],
+            dest: 'dist/',
+            rename: function(dest, src) {
+              return dest + src.replace(/\.js$/, '.min.js');
+            }
          }
-        }]
+        ]
      }
    },

@@ -157,48 +165,78 @@ module.exports = function(grunt) {
        }
      }
    },
+    karma: {
+      options: {
+        configFile: 'karma.conf.js'
+      },
+      saucelabs: {
+        build: process.env.TRAVIS_JOB_ID || 'non-travis',
+        configFile: 'karma-setup/default/karma.conf.js',
+        ...require('./karma-setup/shared/saucelabs'),
+        singleRun: true
+      },
+      default: {
+        browsers: [],
+        configFile: 'karma-setup/default/karma.conf.js',
+        singleRun: false,
+        autoWatch: true
+      },
+      amd: {
+        configFile: 'karma-setup/amd/karma.conf.js',
+        browsers: [],
+        singleRun: false,
+        autoWatch: true
+      }
+    },
    'saucelabs-mocha': {
      all: {
        options: {
          build: process.env.TRAVIS_JOB_ID,
-          urls: ['http://localhost:9999/spec/?headless=true', 'http://localhost:9999/spec/amd.html?headless=true'],
+          urls: [
+            'http://localhost:9999/spec/?headless=true',
+            'http://localhost:9999/spec/amd.html?headless=true'
+          ],
          detailedError: true,
          concurrency: 4,
          browsers: [
-            {browserName: 'chrome'},
-            {browserName: 'firefox', platform: 'Linux'},
-            // {browserName: 'safari', version: 9, platform: 'OS X 10.11'},
-            // {browserName: 'safari', version: 8, platform: 'OS X 10.10'},
-            {browserName: 'internet explorer', version: 11, platform: 'Windows 8.1'},
-            {browserName: 'internet explorer', version: 10, platform: 'Windows 8'}
+            { browserName: 'chrome' },
+            { browserName: 'firefox', platform: 'Linux' },
+            { browserName: 'safari', version: 9, platform: 'OS X 10.11' },
+            { browserName: 'safari', version: 8, platform: 'OS X 10.10' },
+            {
+              browserName: 'internet explorer',
+              version: 11,
+              platform: 'Windows 8.1'
+            },
+            {
+              browserName: 'internet explorer',
+              version: 10,
+              platform: 'Windows 8'
+            }
          ]
        }
      },
      sanity: {
        options: {
          build: process.env.TRAVIS_JOB_ID,
-          urls: ['http://localhost:9999/spec/umd.html?headless=true', 'http://localhost:9999/spec/amd-runtime.html?headless=true', 'http://localhost:9999/spec/umd-runtime.html?headless=true'],
+          urls: [
+            'http://localhost:9999/spec/umd.html?headless=true',
+            'http://localhost:9999/spec/amd-runtime.html?headless=true',
+            'http://localhost:9999/spec/umd-runtime.html?headless=true'
+          ],
          detailedError: true,
          concurrency: 2,
-          browsers: [
-            {browserName: 'chrome'}
-          ]
+          browsers: [{ browserName: 'chrome' }]
        }
      }
    },

    bgShell: {
-      checkTypes: {
-        cmd: 'npm run checkTypes',
-        bg: false,
-        fail: true
-      },
      integrationTests: {
        cmd: './integration-testing/run-integration-tests.sh',
        bg: false,
        fail: true
      }
-
    },

    watch: {
@@ -208,26 +246,11 @@ module.exports = function(grunt) {
        },

        files: ['src/*', 'lib/**/*.js', 'spec/**/*.js'],
-        tasks: ['build', 'amd', 'tests', 'test']
+        tasks: ['on-file-change']
      }
    }
  });

-  // Build a new version of the library
-  this.registerTask('build', 'Builds a distributable version of the current project', [
-                    'eslint',
-                    'bgShell:checkTypes',
-                    'parser',
-                    'node',
-                    'globals']);
-
-  this.registerTask('amd', ['babel:amd', 'requirejs']);
-  this.registerTask('node', ['babel:cjs']);
-  this.registerTask('globals', ['webpack']);
-  this.registerTask('tests', ['concat:tests']);
-
-  this.registerTask('release', 'Build final packages', ['eslint', 'amd', 'uglify', 'test:min', 'copy:dist', 'copy:components', 'copy:cdnjs']);
-
  // Load tasks from npm
  grunt.loadNpmTasks('grunt-contrib-clean');
  grunt.loadNpmTasks('grunt-contrib-concat');
@@ -238,18 +261,61 @@ module.exports = function(grunt) {
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-babel');
  grunt.loadNpmTasks('grunt-bg-shell');
-  grunt.loadNpmTasks('grunt-eslint');
-  grunt.loadNpmTasks('@knappi/grunt-saucelabs');
+  grunt.loadNpmTasks('grunt-karma');
  grunt.loadNpmTasks('grunt-webpack');

  grunt.task.loadTasks('tasks');

+  this.registerTask(
+    'build',
+    'Builds a distributable version of the current project',
+    ['parser', 'node', 'globals']
+  );
+
+  this.registerTask('node', ['babel:cjs']);
+  this.registerTask('globals', ['webpack']);
+
+  this.registerTask('release', 'Build final packages', [
+    'amd',
+    'uglify',
+    'test:min',
+    'copy:dist',
+    'copy:components',
+    'copy:cdnjs'
+  ]);
+
+  this.registerTask('amd', ['babel:amd', 'requirejs']);
+
+  this.registerTask('test', ['test:bin', 'test:cov']);
+
  grunt.registerTask('bench', ['metrics']);
-  grunt.registerTask('sauce', process.env.SAUCE_USERNAME ? ['tests', 'connect', 'saucelabs-mocha'] : []);

-  grunt.registerTask('travis', process.env.PUBLISH ? ['default', 'bgShell:integrationTests', 'sauce', 'metrics', 'publish:latest'] : ['default']);
+  if (process.env.SAUCE_ACCESS_KEY) {
+    grunt.registerTask('sauce', ['karma:saucelabs']);
+  } else {
+    grunt.registerTask('sauce', []);
+  }

+  // Requires secret properties (saucelabs-credentials etc.) from .travis.yaml
+  grunt.registerTask('extensive-tests-and-publish-to-aws', [
+    'default',
+    'bgShell:integrationTests',
+    'sauce',
+    'metrics',
+    'publish-to-aws'
+  ]);
+  grunt.registerTask('on-file-change', [
+    'build',
+    'amd',
+    'concat:tests',
+    'test'
+  ]);
+
+  // === Primary tasks ===
  grunt.registerTask('dev', ['clean', 'connect', 'watch']);
  grunt.registerTask('default', ['clean', 'build', 'test', 'release']);
-  grunt.registerTask('integration-tests', ['default', 'bgShell:integrationTests']);
+  grunt.registerTask('integration-tests', [
+    'default',
+    'bgShell:integrationTests'
+  ]);
 };
@@ -1,4 +1,4 @@
-Copyright (C) 2011-2017 by Yehuda Katz
+Copyright (C) 2011-2019 by Yehuda Katz

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -11,12 +11,12 @@ Handlebars.js and Mustache are both logicless templating languages that
 keep the view and the code separated like we all know they should be.

 Checkout the official Handlebars docs site at
-[http://www.handlebarsjs.com](http://www.handlebarsjs.com) and the live demo at [http://tryhandlebarsjs.com/](http://tryhandlebarsjs.com/).
+[https://handlebarsjs.com/](https://handlebarsjs.com) and the live demo at [http://tryhandlebarsjs.com/](http://tryhandlebarsjs.com/).

 Installing
 ----------

-See our [installation documentation](http://handlebarsjs.com/installation.html).
+See our [installation documentation](https://handlebarsjs.com/installation/).

 Usage
 -----
@@ -46,23 +46,23 @@ var result = template(data);
 // </ul>
 ```

-Full documentation and more examples are at [handlebarsjs.com](http://handlebarsjs.com/).
+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](http://handlebarsjs.com/precompilation.html).
+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](http://handlebarsjs.com/#paths)
- [Helpers](http://handlebarsjs.com/#helpers)
- [Block Expressions](http://handlebarsjs.com/#block-expressions)
- [Literal Values](http://handlebarsjs.com/#literals)
- [Delimited Comments](http://handlebarsjs.com/#comments)
+- [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](http://mustache.github.io/mustache.5.html) defines the exact behavior of sections. In the case of name conflicts, helpers are given priority.

@@ -13,8 +13,7 @@ install:
  # Clone submodules (mustache spec)
  - cmd: git submodule update --init --recursive
  # Install modules
-  - cmd: npm install
-  - cmd: npm install -g grunt-cli
+  - cmd: npm ci


 # Post-install test scripts
@@ -23,7 +22,7 @@ test_script:
  - cmd: node --version
  - cmd: npm --version
  # Run tests
-  - cmd: grunt --stack travis
+  - cmd: npm run test

 # Don't actually build
 build: off
@@ -34,4 +33,4 @@ on_failure:


 # Set build version format here instead of in the admin panel
-version: "{build}"
+version: "{build}"
@@ -1,4 +1,5 @@
 {
+  "extends": "prettier",
  "globals": {
    "require": true
  },
@@ -11,4 +12,4 @@
    "handle-callback-err": 0,
    "no-console": 0
  }
-}
+}
@@ -1,12 +1,14 @@
 var async = require('neo-async'),
-    fs = require('fs'),
-    zlib = require('zlib');
+  fs = require('fs'),
+  zlib = require('zlib');

 module.exports = function(grunt, callback) {
  var distFiles = fs.readdirSync('dist'),
-      distSizes = {};
+    distSizes = {};

-  async.each(distFiles, function(file, callback) {
+  async.each(
+    distFiles,
+    function(file, callback) {
      var content;
      try {
        content = fs.readFileSync('dist/' + file);
@@ -32,7 +34,10 @@ module.exports = function(grunt, callback) {
      });
    },
    function() {
-      grunt.log.writeln('Distribution sizes: ' + JSON.stringify(distSizes, undefined, 2));
+      grunt.log.writeln(
+        'Distribution sizes: ' + JSON.stringify(distSizes, undefined, 2)
+      );
      callback([distSizes]);
-    });
+    }
+  );
 };
@@ -2,7 +2,7 @@ var fs = require('fs');

 var metrics = fs.readdirSync(__dirname);
 metrics.forEach(function(metric) {
-  if (metric === 'index.js' || !(/(.*)\.js$/.test(metric))) {
+  if (metric === 'index.js' || !/(.*)\.js$/.test(metric)) {
    return;
  }

@@ -1,5 +1,5 @@
 var _ = require('underscore'),
-    templates = require('./templates');
+  templates = require('./templates');

 module.exports = function(grunt, callback) {
  // Deferring to here in case we have a build for parser, etc as part of this grunt exec
@@ -8,12 +8,17 @@ module.exports = function(grunt, callback) {
  var templateSizes = {};
  _.each(templates, function(info, template) {
    var src = info.handlebars,
-        compiled = Handlebars.precompile(src, {}),
-        knownHelpers = Handlebars.precompile(src, {knownHelpersOnly: true, knownHelpers: info.helpers});
+      compiled = Handlebars.precompile(src, {}),
+      knownHelpers = Handlebars.precompile(src, {
+        knownHelpersOnly: true,
+        knownHelpers: info.helpers
+      });

    templateSizes[template] = compiled.length;
    templateSizes['knownOnly_' + template] = knownHelpers.length;
  });
-  grunt.log.writeln('Precompiled sizes: ' + JSON.stringify(templateSizes, undefined, 2));
+  grunt.log.writeln(
+    'Precompiled sizes: ' + JSON.stringify(templateSizes, undefined, 2)
+  );
  callback([templateSizes]);
 };
@@ -8,5 +8,6 @@ module.exports = {
    bar: true
  },

-  handlebars: '{{foo person "person" 1 true foo=bar foo="person" foo=1 foo=true}}'
+  handlebars:
+    '{{foo person "person" 1 true foo=bar foo="person" foo=1 foo=true}}'
 };
@@ -1,5 +1,12 @@
 module.exports = {
-  context: { names: [{name: 'Moe'}, {name: 'Larry'}, {name: 'Curly'}, {name: 'Shemp'}] },
+  context: {
+    names: [
+      { name: 'Moe' },
+      { name: 'Larry' },
+      { name: 'Curly' },
+      { name: 'Shemp' }
+    ]
+  },
  handlebars: '{{#each names}}{{name}}{{/each}}',
  dust: '{#names}{name}{/names}',
  mustache: '{{#names}}{{name}}{{/names}}',
@@ -1,4 +1,11 @@
 module.exports = {
-  context: { names: [{name: 'Moe'}, {name: 'Larry'}, {name: 'Curly'}, {name: 'Shemp'}] },
+  context: {
+    names: [
+      { name: 'Moe' },
+      { name: 'Larry' },
+      { name: 'Curly' },
+      { name: 'Shemp' }
+    ]
+  },
  handlebars: '{{#names}}{{name}}{{/names}}'
 };
@@ -7,9 +7,9 @@ module.exports = {
    },
    hasItems: true, // To make things fairer in mustache land due to no `{{if}}` construct on arrays
    items: [
-      {name: 'red', current: true, url: '#Red'},
-      {name: 'green', current: false, url: '#Green'},
-      {name: 'blue', current: false, url: '#Blue'}
+      { name: 'red', current: true, url: '#Red' },
+      { name: 'green', current: false, url: '#Green' },
+      { name: 'blue', current: false, url: '#Blue' }
    ]
  },

@@ -1,4 +1,11 @@
 module.exports = {
-  context: { names: [{name: 'Moe'}, {name: 'Larry'}, {name: 'Curly'}, {name: 'Shemp'}] },
+  context: {
+    names: [
+      { name: 'Moe' },
+      { name: 'Larry' },
+      { name: 'Curly' },
+      { name: 'Shemp' }
+    ]
+  },
  handlebars: '{{#each names}}{{@index}}{{name}}{{/each}}'
 };
@@ -1,5 +1,13 @@
 module.exports = {
-  context: { names: [{name: 'Moe'}, {name: 'Larry'}, {name: 'Curly'}, {name: 'Shemp'}], foo: 'bar' },
+  context: {
+    names: [
+      { name: 'Moe' },
+      { name: 'Larry' },
+      { name: 'Curly' },
+      { name: 'Shemp' }
+    ],
+    foo: 'bar'
+  },
  handlebars: '{{#each names}}{{../foo}}{{/each}}',
  mustache: '{{#names}}{{foo}}{{/names}}',
  eco: '<% for item in @names: %><%= @foo %><% end %>'
@@ -1,6 +1,16 @@
 module.exports = {
-  context: { names: [{bat: 'foo', name: ['Moe']}, {bat: 'foo', name: ['Larry']}, {bat: 'foo', name: ['Curly']}, {bat: 'foo', name: ['Shemp']}], foo: 'bar' },
-  handlebars: '{{#each names}}{{#each name}}{{../bat}}{{../../foo}}{{/each}}{{/each}}',
+  context: {
+    names: [
+      { bat: 'foo', name: ['Moe'] },
+      { bat: 'foo', name: ['Larry'] },
+      { bat: 'foo', name: ['Curly'] },
+      { bat: 'foo', name: ['Shemp'] }
+    ],
+    foo: 'bar'
+  },
+  handlebars:
+    '{{#each names}}{{#each name}}{{../bat}}{{../../foo}}{{/each}}{{/each}}',
  mustache: '{{#names}}{{#name}}{{bat}}{{foo}}{{/name}}{{/names}}',
-  eco: '<% for item in @names: %><% for child in item.name: %><%= item.bat %><%= @foo %><% end %><% end %>'
+  eco:
+    '<% for item in @names: %><% for child in item.name: %><%= item.bat %><%= @foo %><% end %><% end %>'
 };
@@ -2,7 +2,7 @@ var fs = require('fs');

 var templates = fs.readdirSync(__dirname);
 templates.forEach(function(template) {
-  if (template === 'index.js' || !(/(.*)\.js$/.test(template))) {
+  if (template === 'index.js' || !/(.*)\.js$/.test(template)) {
    return;
  }
  module.exports[RegExp.$1] = require('./' + RegExp.$1);
@@ -1,5 +1,8 @@
 module.exports = {
-  context: { name: '1', kids: [{ name: '1.1', kids: [{name: '1.1.1', kids: []}] }] },
+  context: {
+    name: '1',
+    kids: [{ name: '1.1', kids: [{ name: '1.1.1', kids: [] }] }]
+  },
  partials: {
    mustache: { recursion: '{{name}}{{#kids}}{{>recursion}}{{/kids}}' },
    handlebars: { recursion: '{{name}}{{#each kids}}{{>recursion}}{{/each}}' }
@@ -1,8 +1,16 @@
 module.exports = {
-  context: { peeps: [{name: 'Moe', count: 15}, {name: 'Larry', count: 5}, {name: 'Curly', count: 1}] },
+  context: {
+    peeps: [
+      { name: 'Moe', count: 15 },
+      { name: 'Larry', count: 5 },
+      { name: 'Curly', count: 1 }
+    ]
+  },
  partials: {
    mustache: { variables: 'Hello {{name}}! You have {{count}} new messages.' },
-    handlebars: { variables: 'Hello {{name}}! You have {{count}} new messages.' }
+    handlebars: {
+      variables: 'Hello {{name}}! You have {{count}} new messages.'
+    }
  },

  handlebars: '{{#each peeps}}{{>variables}}{{/each}}',
@@ -1,7 +1,9 @@
 module.exports = {
-  context: { person: { name: {bar: {baz: 'Larry'}}, age: 45 } },
-  handlebars: '{{person.name.bar.baz}}{{person.age}}{{person.foo}}{{animal.age}}',
+  context: { person: { name: { bar: { baz: 'Larry' } }, age: 45 } },
+  handlebars:
+    '{{person.name.bar.baz}}{{person.age}}{{person.foo}}{{animal.age}}',
  dust: '{person.name.bar.baz}{person.age}{person.foo}{animal.age}',
-  eco: '<%= @person.name.bar.baz %><%= @person.age %><%= @person.foo %><% if @animal: %><%= @animal.age %><% end %>',
+  eco:
+    '<%= @person.name.bar.baz %><%= @person.age %><%= @person.foo %><% if @animal: %><%= @animal.age %><% end %>',
  mustache: '{{person.name.bar.baz}}{{person.age}}{{person.foo}}{{animal.age}}'
 };
@@ -1,8 +1,7 @@
 module.exports = {
-  context: {name: 'Mick', count: 30},
+  context: { name: 'Mick', count: 30 },
  handlebars: 'Hello {{name}}! You have {{count}} new messages.',
  dust: 'Hello {name}! You have {count} new messages.',
  mustache: 'Hello {{name}}! You have {{count}} new messages.',
  eco: 'Hello <%= @name %>! You have <%= @count %> new messages.'
 };
-
@@ -1,19 +1,27 @@
 var _ = require('underscore'),
-    runner = require('./util/template-runner'),
-
-    eco, dust, Handlebars, Mustache;
+  runner = require('./util/template-runner'),
+  eco,
+  dust,
+  Handlebars,
+  Mustache;

 try {
  dust = require('dustjs-linkedin');
-} catch (err) { /* NOP */ }
+} catch (err) {
+  /* NOP */
+}

 try {
  Mustache = require('mustache');
-} catch (err) { /* NOP */ }
+} catch (err) {
+  /* NOP */
+}

 try {
  eco = require('eco');
-} catch (err) { /* NOP */ }
+} catch (err) {
+  /* NOP */
+}

 function error() {
  throw new Error('EWOT');
@@ -22,21 +30,28 @@ function error() {
 function makeSuite(bench, name, template, handlebarsOnly) {
  // Create aliases to minimize any impact from having to walk up the closure tree.
  var templateName = name,
+    context = template.context,
+    partials = template.partials,
+    handlebarsOut,
+    compatOut,
+    dustOut,
+    ecoOut,
+    mustacheOut;

-      context = template.context,
-      partials = template.partials,
-
-      handlebarsOut,
-      compatOut,
-      dustOut,
-      ecoOut,
-      mustacheOut;
-
-  var handlebar = Handlebars.compile(template.handlebars, {data: false}),
-      compat = Handlebars.compile(template.handlebars, {data: false, compat: true}),
-      options = {helpers: template.helpers};
-  _.each(template.partials && template.partials.handlebars, function(partial, partialName) {
-    Handlebars.registerPartial(partialName, Handlebars.compile(partial, {data: false}));
+  var handlebar = Handlebars.compile(template.handlebars, { data: false }),
+    compat = Handlebars.compile(template.handlebars, {
+      data: false,
+      compat: true
+    }),
+    options = { helpers: template.helpers };
+  _.each(template.partials && template.partials.handlebars, function(
+    partial,
+    partialName
+  ) {
+    Handlebars.registerPartial(
+      partialName,
+      Handlebars.compile(partial, { data: false })
+    );
  });

  handlebarsOut = handlebar(context, options);
@@ -58,7 +73,9 @@ function makeSuite(bench, name, template, handlebarsOnly) {
      dustOut = false;
      dust.loadSource(dust.compile(template.dust, templateName));

-      dust.render(templateName, context, function(err, out) { dustOut = out; });
+      dust.render(templateName, context, function(err, out) {
+        dustOut = out;
+      });

      bench('dust', function() {
        dust.render(templateName, context, function() {});
@@ -84,7 +101,7 @@ function makeSuite(bench, name, template, handlebarsOnly) {

  if (Mustache) {
    var mustacheSource = template.mustache,
-        mustachePartials = partials && partials.mustache;
+      mustachePartials = partials && partials.mustache;

    if (mustacheSource) {
      mustacheOut = Mustache.to_html(mustacheSource, context, mustachePartials);
@@ -107,9 +124,16 @@ function makeSuite(bench, name, template, handlebarsOnly) {
    b = b.replace(/\s/g, '');

    if (handlebarsOut !== b) {
-      throw new Error('Template output mismatch: ' + name
-            + '\n\nHandlebars: ' + handlebarsOut
-            + '\n\n' + lang + ': ' + b);
+      throw new Error(
+        'Template output mismatch: ' +
+          name +
+          '\n\nHandlebars: ' +
+          handlebarsOut +
+          '\n\n' +
+          lang +
+          ': ' +
+          b
+      );
    }
  }

@@ -1,5 +1,5 @@
 var _ = require('underscore'),
-    Benchmark = require('benchmark');
+  Benchmark = require('benchmark');

 function BenchWarmer() {
  this.benchmarks = [];
@@ -29,20 +29,25 @@ BenchWarmer.prototype = {
    });
  },
  push: function(name, fn) {
-    if (this.names.indexOf(name) == -1) {
+    if (this.names.indexOf(name) === -1) {
      this.names.push(name);
    }

-    var first = this.first, suiteName = this.suiteName, self = this;
+    var first = this.first,
+      suiteName = this.suiteName,
+      self = this;
    this.first = false;

    var bench = new Benchmark(fn, {
      name: this.suiteName + ': ' + name,
      onComplete: function() {
-        if (first) { self.startLine(suiteName); }
+        if (first) {
+          self.startLine(suiteName);
+        }
        self.writeBench(bench);
        self.currentBenches.push(bench);
-      }, onError: function() {
+      },
+      onError: function() {
        self.errors[this.name] = this;
      }
    });
@@ -75,10 +80,14 @@ BenchWarmer.prototype = {
        });
        print('\n');

-        var errors = false, prop, bench;
+        var errors = false,
+          prop,
+          bench;
        for (prop in self.errors) {
-          if (self.errors.hasOwnProperty(prop)
-              && self.errors[prop].error.message !== 'EWOT') {
+          if (
+            Object.prototype.hasOwnProperty.call(self, prop) &&
+            self.errors[prop].error.message !== 'EWOT'
+          ) {
            errors = true;
            break;
          }
@@ -86,9 +95,8 @@ BenchWarmer.prototype = {

        if (errors) {
          print('\n\nErrors:\n');
-          for (prop in self.errors) {
-            if (self.errors.hasOwnProperty(prop)
-                && self.errors[prop].error.message !== 'EWOT') {
+          Object.keys(self.errors).forEach(function(prop) {
+            if (self.errors[prop].error.message !== 'EWOT') {
              bench = self.errors[prop];
              print('\n' + bench.name + ':\n');
              print(bench.error.message);
@@ -97,7 +105,7 @@ BenchWarmer.prototype = {
              }
              print('\n');
            }
-          }
+          });
        }

        callback();
@@ -108,23 +116,39 @@ BenchWarmer.prototype = {
  },

  scaleTimes: function() {
-    var scaled = this.scaled = {};
-    _.each(this.times, function(times, name) {
-      var output = scaled[name] = {};
+    var scaled = (this.scaled = {});
+    _.each(
+      this.times,
+      function(times, name) {
+        var output = (scaled[name] = {});

-      _.each(times, function(time, lang) {
-        output[lang] = ((time - this.minimum) / (this.maximum - this.minimum) * 100).toFixed(2);
-      }, this);
-    }, this);
+        _.each(
+          times,
+          function(time, lang) {
+            output[lang] = (
+              ((time - this.minimum) / (this.maximum - this.minimum)) *
+              100
+            ).toFixed(2);
+          },
+          this
+        );
+      },
+      this
+    );
  },

  printHeader: function(title, winners) {
-    var benchSize = 0, names = this.names, i, l;
+    var benchSize = 0,
+      names = this.names,
+      i,
+      l;

    for (i = 0, l = names.length; i < l; i++) {
      var name = names[i];

-      if (benchSize < name.length) { benchSize = name.length; }
+      if (benchSize < name.length) {
+        benchSize = name.length;
+      }
    }

    this.nameSize = benchSize + 2;
@@ -147,7 +171,9 @@ BenchWarmer.prototype = {
  },

  startLine: function(name) {
-    var winners = Benchmark.map(this.winners(this.currentBenches), function(bench) {
+    var winners = Benchmark.map(this.winners(this.currentBenches), function(
+      bench
+    ) {
      return bench.name.split(': ')[1];
    });

@@ -165,9 +191,9 @@ BenchWarmer.prototype = {

    if (!bench.error) {
      var count = bench.hz,
-          moe = count * bench.stats.rme / 100,
-          minimum,
-          maximum;
+        moe = (count * bench.stats.rme) / 100,
+        minimum,
+        maximum;

      count = Math.round(count / 1000);
      moe = Math.round(moe / 1000);
@@ -1,12 +1,12 @@
 var _ = require('underscore'),
-    BenchWarmer = require('./benchwarmer'),
-    templates = require('../templates');
+  BenchWarmer = require('./benchwarmer'),
+  templates = require('../templates');

 module.exports = function(grunt, makeSuite, callback) {
  var warmer = new BenchWarmer();

  var handlebarsOnly = grunt.option('handlebars-only'),
-      grep = grunt.option('grep');
+    grep = grunt.option('grep');
  if (grep) {
    grep = new RegExp(grep);
  }
@@ -0,0 +1,6 @@
+module.exports = {
+  rules: {
+    'no-console': 0,
+    'no-var': 0
+  }
+};
@@ -1,128 +1,176 @@
 #!/usr/bin/env node

-var optimist = require('optimist')
-    .usage('Precompile handlebar templates.\nUsage: $0 [template|directory]...', {
-      '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'
-      },
+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'
+  }
+});

-      'help': {
-        'type': 'boolean',
-        'description': 'Outputs this message'
-      }
-    })
-
-    .wrap(120)
-    .check(function(argv) {
-      if (argv.version) {
-        return;
-      }
-    });
-
-
-var argv = optimist.argv;
 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)) {
-    optimist.showHelp();
+    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
+      );
+  });
+}
@@ -1,6 +1,6 @@
 {
  "name": "handlebars",
-  "version": "4.5.1",
+  "version": "4.7.6",
  "main": "handlebars.js",
  "license": "MIT",
  "dependencies": {}
@@ -2,7 +2,7 @@
 <package>
 	<metadata>
 		<id>handlebars.js</id>
-		<version>4.5.1</version>
+		<version>4.7.6</version>
 		<authors>handlebars.js Authors</authors>
 		<licenseUrl>https://github.com/wycats/handlebars.js/blob/master/LICENSE</licenseUrl>
 		<projectUrl>https://github.com/wycats/handlebars.js/</projectUrl>
@@ -1,6 +1,6 @@
 {
  "name": "handlebars",
-  "version": "4.5.1",
+  "version": "4.7.6",
  "license": "MIT",
  "jspm": {
    "main": "handlebars",
@@ -1,12 +1,13 @@
 module.exports = {
-  "extends": "eslint:recommended",
-  "globals": {
-    "self": false
+  extends: ['eslint:recommended', 'plugin:es5/no-es2015', 'prettier'],
+  globals: {
+    self: false
  },
-  "env": {
-    "node": true
+  env: {
+    node: true
  },
-  "rules": {
-    'no-console': 'off'
+  rules: {
+    'no-console': 'off',
+    'no-var': 'off'
  }
-}
+};
@@ -5,7 +5,7 @@ var Handlebars = require('handlebars');
 console.log('Testing built Handlebars with Node version ' + process.version);

 var template = Handlebars.compile('Author: {{author}}');
-var output = template({author: 'Yehuda'});
+var output = template({ author: 'Yehuda' });
 assert.strictEqual(output, 'Author: Yehuda');

 console.log('Success');
@@ -1,5 +1,7 @@
 #!/bin/bash

+set -e
+
 cd "$( dirname "$( readlink -f "$0" )" )" || exit 1
 # shellcheck disable=SC1090
 [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
@@ -12,15 +14,16 @@ cd "$( dirname "$( readlink -f "$0" )" )" || exit 1
 # It does (almost) not test for correctness, because that is already done in the mocha-tests.
 # And it does not use any NodeJS based testing framwork to make this part independent of the Node version.

-# A list of NodeJS versions is expected as cli-args
+unset npm_config_prefix
+
 echo "Handlebars should be able to run in various versions of NodeJS"
-for i in  0.10 0.12 4 5 6 7 8 9 10 11 ; do
+for i in  0.10 0.12 4 5 6 7 8 9 10 11 12 13 ; do
    rm target node_modules package-lock.json -rf
    mkdir target
    nvm install "$i"
    nvm exec "$i" npm install
-    nvm exec "$i" npm run test || exit 1
-    nvm exec "$i" npm run test-precompile || exit 1
+    nvm exec "$i" npm run test
+    nvm exec "$i" npm run test-precompile

    echo Success
-done
+done
@@ -1,13 +1,15 @@
 #!/bin/bash

-cd "$( dirname "$( readlink -f "$0" )" )" || exit 1
+set -e
+
+cd "$( dirname "$( readlink -f "$0" )" )"

 for i in */test.sh ; do
  (
    echo "----------------------------------------"
    echo "-- Running integration test: $i"
    echo "----------------------------------------"
-    cd "$( dirname "$i" )" || exit 1
-    ./test.sh || exit 1
+    cd "$( dirname "$i" )"
+    ./test.sh
  )
-done
+done
@@ -1,12 +1,12 @@
-import * as Handlebars from 'handlebars/runtime'
+import * as Handlebars from 'handlebars/runtime';
 import hbs from 'handlebars-inline-precompile';
-import {assertEquals} from "../../webpack-test/src/lib/assert";
+import { assertEquals } from '../../webpack-test/src/lib/assert';

 Handlebars.registerHelper('loud', function(text) {
-    return text.toUpperCase();
+  return text.toUpperCase();
 });

 const template = hbs`{{loud name}}`;
-const output = template({name: 'yehuda'})
+const output = template({ name: 'yehuda' });

-assertEquals(output, 'YEHUDA')
+assertEquals(output, 'YEHUDA');
@@ -1,5 +1,5 @@
 export function assertEquals(actual, expected) {
-    if (actual !== expected) {
-        throw new Error(`Expected "${actual}" to equal "${expected}"`);
-    }
+  if (actual !== expected) {
+    throw new Error(`Expected "${actual}" to equal "${expected}"`);
+  }
 }
@@ -3,30 +3,30 @@ const fs = require('fs');
 const testFiles = fs.readdirSync('src');
 const entryPoints = {};
 testFiles
-    .filter(file => file.match(/-test.js$/))
-    .forEach(file => {
-        entryPoints[file] = `./src/${file}`;
-    });
+  .filter(file => file.match(/-test.js$/))
+  .forEach(file => {
+    entryPoints[file] = `./src/${file}`;
+  });

 module.exports = {
-    entry: entryPoints,
-    output: {
-        filename: '[name]',
-        path: __dirname + '/dist'
-    },
-    module: {
-        rules: [
-            {
-                test: /\.js?$/,
-                exclude: /node_modules/,
-                use: {
-                    loader: 'babel-loader',
-                    options: { cacheDirectory: false },
-                }
-            }
-        ]
-    },
-    optimization: {
-        minimize: false
-    }
+  entry: entryPoints,
+  output: {
+    filename: '[name]',
+    path: __dirname + '/dist'
+  },
+  module: {
+    rules: [
+      {
+        test: /\.js?$/,
+        exclude: /node_modules/,
+        use: {
+          loader: 'babel-loader',
+          options: { cacheDirectory: false }
+        }
+      }
+    ]
+  },
+  optimization: {
+    minimize: false
+  }
 };
@@ -1,6 +1,6 @@
 import Handlebars from 'handlebars/dist/handlebars';

-import {assertEquals} from './lib/assert';
+import { assertEquals } from './lib/assert';

 const template = Handlebars.compile('Author: {{author}}');
-assertEquals(template({author: 'Yehuda'}), 'Author: Yehuda');
+assertEquals(template({ author: 'Yehuda' }), 'Author: Yehuda');
@@ -1,6 +1,5 @@
 import Handlebars from 'handlebars';
-import {assertEquals} from './lib/assert';
-
+import { assertEquals } from './lib/assert';

 const template = Handlebars.compile('Author: {{author}}');
-assertEquals(template({author: 'Yehuda'}), 'Author: Yehuda');
+assertEquals(template({ author: 'Yehuda' }), 'Author: Yehuda');
@@ -1,8 +1,10 @@
-import {assertEquals} from './lib/assert';
+import { assertEquals } from './lib/assert';

 import testTemplate from './test-template.handlebars';
-assertEquals(testTemplate({author: 'Yehuda'}).trim(), 'Author: Yehuda');
-
+assertEquals(testTemplate({ author: 'Yehuda' }).trim(), 'Author: Yehuda');

 const testTemplateRequire = require('./test-template.handlebars');
-assertEquals(testTemplateRequire({author: 'Yehuda'}).trim(), 'Author: Yehuda');
+assertEquals(
+  testTemplateRequire({ author: 'Yehuda' }).trim(),
+  'Author: Yehuda'
+);
@@ -1,10 +1,10 @@
 import * as HandlebarsViaImport from 'handlebars';
 const HandlebarsViaRequire = require('handlebars');
-import {assertEquals} from './lib/assert';
+import { assertEquals } from './lib/assert';

 HandlebarsViaImport.registerHelper('loud', function(text) {
-    return text.toUpperCase();
+  return text.toUpperCase();
 });

 const template = HandlebarsViaRequire.compile('Author: {{loud author}}');
-assertEquals(template({author: 'Yehuda'}), 'Author: YEHUDA');
+assertEquals(template({ author: 'Yehuda' }), 'Author: YEHUDA');
@@ -1,6 +1,6 @@
 import * as Handlebars from 'handlebars/dist/handlebars';

-import {assertEquals} from './lib/assert';
+import { assertEquals } from './lib/assert';

 const template = Handlebars.compile('Author: {{author}}');
-assertEquals(template({author: 'Yehuda'}), 'Author: Yehuda');
+assertEquals(template({ author: 'Yehuda' }), 'Author: Yehuda');
@@ -1,5 +1,5 @@
 import * as Handlebars from 'handlebars';
-import {assertEquals} from './lib/assert';
+import { assertEquals } from './lib/assert';

 const template = Handlebars.compile('Author: {{author}}');
-assertEquals(template({author: 'Yehuda'}), 'Author: Yehuda');
+assertEquals(template({ author: 'Yehuda' }), 'Author: Yehuda');
@@ -1,5 +1,5 @@
 export function assertEquals(actual, expected) {
-    if (actual !== expected) {
-        throw new Error(`Expected "${actual}" to equal "${expected}"`);
-    }
+  if (actual !== expected) {
+    throw new Error(`Expected "${actual}" to equal "${expected}"`);
+  }
 }
@@ -3,20 +3,18 @@ const fs = require('fs');
 const testFiles = fs.readdirSync('src');
 const entryPoints = {};
 testFiles
-    .filter(file => file.match(/-test.js$/))
-    .forEach(file => {
-        entryPoints[file] = `./src/${file}`;
-    });
+  .filter(file => file.match(/-test.js$/))
+  .forEach(file => {
+    entryPoints[file] = `./src/${file}`;
+  });

 module.exports = {
-    entry: entryPoints,
-    output: {
-        filename: '[name]',
-        path: __dirname + '/dist'
-    },
-    module: {
-        rules: [
-            {test: /\.handlebars$/, loader: 'handlebars-loader'}
-        ]
-    }
+  entry: entryPoints,
+  output: {
+    filename: '[name]',
+    path: __dirname + '/dist'
+  },
+  module: {
+    rules: [{ test: /\.handlebars$/, loader: 'handlebars-loader' }]
+  }
 };
@@ -0,0 +1,56 @@
+{
+  "extends": [
+    "../.eslintrc.js"
+  ],
+  "overrides": [
+    {
+      "extends": [
+        "plugin:es5/no-es2015",
+        "prettier"
+      ],
+      "files": ["**/*.browser.js"],
+      "plugins": [
+        "es5"
+      ],
+      "globals": {
+        "TODO: clean this up": true,
+        "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"
+      }
+    },
+  ]
+
+}
@@ -0,0 +1,19 @@
+module.exports = function(config) {
+  config.set({
+    basePath: '../..',
+    reporters: ['dots'],
+    frameworks: ['mocha', 'requirejs'],
+    browsers: ['Chrome'],
+    files: [
+      { pattern: 'node_modules/sinon/pkg/sinon.js', included: false },
+      { pattern: 'node_modules/chai/chai.js', included: false },
+      { pattern: 'node_modules/dirty-chai/lib/dirty-chai.js', included: false },
+      { pattern: 'dist/handlebars.amd.js', included: false },
+      'karma-setup/shared/*.browser.js',
+      'karma-setup/amd/*.browser.js',
+      'spec/vendor/json2.js',
+      'spec/env/common.js',
+      { pattern: 'spec/*.js', included: false }
+    ]
+  });
+};
@@ -0,0 +1,38 @@
+/* global requirejs */
+
+var tests = Object.keys(window.__karma__.files).filter(function(file) {
+  return file.match(/^\/base\/spec\/[^/]*\.js/);
+});
+
+requirejs.config({
+  // Karma serves files from '/base'
+  baseUrl: '/base',
+
+  paths: {
+    handlebars: 'dist/handlebars.amd',
+    sinon: 'node_modules/sinon/pkg/sinon',
+    chai: 'node_modules/chai/chai',
+    dirtyChai: 'node_modules/dirty-chai/lib/dirty-chai'
+  },
+
+  // start test run, once Require.js is done
+  callback: function() {
+    require(['handlebars', 'chai', 'dirtyChai', 'sinon'], function(
+      Handlebars,
+      chai,
+      dirtyChai,
+      sinon
+    ) {
+      window.Handlebars = Handlebars;
+
+      chai.use(dirtyChai);
+      window.expect = chai.expect;
+
+      window.sinon = sinon;
+
+      require(tests, function() {
+        window.__karma__.start();
+      });
+    });
+  }
+});
@@ -0,0 +1 @@
+window.expect = chai.expect;
@@ -0,0 +1,20 @@
+module.exports = function(config) {
+  config.set({
+    basePath: '../..',
+    reporters: ['dots'],
+    frameworks: ['mocha'],
+    browsers: ['Chrome'],
+    files: [
+      'node_modules/sinon/pkg/sinon.js',
+      'node_modules/chai/chai.js',
+      'node_modules/dirty-chai/lib/dirty-chai.js',
+      'karma-setup/shared/*.browser.js',
+      'karma-setup/default/*.browser.js',
+      'spec/vendor/json2.js',
+      'spec/env/common.js',
+
+      'dist/handlebars.js',
+      'spec/*.js'
+    ]
+  });
+};
@@ -0,0 +1,22 @@
+window.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;
+    // eslint-disable-next-line no-eval
+    eval('ret = ' + templateSpec);
+    return ret;
+  } catch (err) {
+    // eslint-disable-next-line no-console
+    console.error(templateSpec);
+    throw err;
+  }
+}
@@ -0,0 +1,47 @@
+// Example set of browsers to run on Sauce Labs
+// Check out https://saucelabs.com/platforms for all browser/platform combos
+const customLaunchers = {
+  sl_chrome: {
+    base: 'SauceLabs',
+    browserName: 'chrome'
+  },
+  sl_firefox: {
+    base: 'SauceLabs',
+    browserName: 'firefox',
+    platform: 'Linux'
+  },
+  sl_safari_9: {
+    base: 'SauceLabs',
+    browserName: 'safari',
+    version: 9,
+    platform: 'OS X 10.11'
+  },
+  sl_safari_8: {
+    base: 'SauceLabs',
+    browserName: 'safari',
+    version: 8,
+    platform: 'OS X 10.10'
+  },
+  sl_ie_10: {
+    base: 'SauceLabs',
+    browserName: 'internet explorer',
+    version: 10,
+    platform: 'Windows 8'
+  },
+  sl_ie_11: {
+    base: 'SauceLabs',
+    browserName: 'internet explorer',
+    platform: 'Windows 8.1',
+    version: '11'
+  }
+};
+
+const browsers = Object.keys(customLaunchers);
+
+module.exports = {
+  customLaunchers,
+  browsers,
+  sauceLabs: {
+    testName: 'handlebars-unit-tests'
+  }
+};
@@ -2,7 +2,11 @@ import runtime from './handlebars.runtime';

 // Compiler imports
 import AST from './handlebars/compiler/ast';
-import { parser as Parser, parse, parseWithoutProcessing } from './handlebars/compiler/base';
+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';
@@ -1,10 +1,11 @@
-import {createFrame, extend, toString} from './utils';
+import { createFrame, extend, toString } from './utils';
 import Exception from './exception';
-import {registerDefaultHelpers} from './helpers';
-import {registerDefaultDecorators} from './decorators';
+import { registerDefaultHelpers } from './helpers';
+import { registerDefaultDecorators } from './decorators';
 import logger from './logger';
+import { resetLoggedProperties } from './internal/proto-access';

-export const VERSION = '4.5.1';
+export const VERSION = '4.7.6';
 export const COMPILER_REVISION = 8;
 export const LAST_COMPATIBLE_COMPILER_REVISION = 7;

@@ -38,7 +39,9 @@ HandlebarsEnvironment.prototype = {

  registerHelper: function(name, fn) {
    if (toString.call(name) === objectType) {
-      if (fn) { throw new Exception('Arg not supported with multiple helpers'); }
+      if (fn) {
+        throw new Exception('Arg not supported with multiple helpers');
+      }
      extend(this.helpers, name);
    } else {
      this.helpers[name] = fn;
@@ -53,7 +56,9 @@ HandlebarsEnvironment.prototype = {
      extend(this.partials, name);
    } else {
      if (typeof partial === 'undefined') {
-        throw new Exception(`Attempting to register a partial called "${name}" as undefined`);
+        throw new Exception(
+          `Attempting to register a partial called "${name}" as undefined`
+        );
      }
      this.partials[name] = partial;
    }
@@ -64,7 +69,9 @@ HandlebarsEnvironment.prototype = {

  registerDecorator: function(name, fn) {
    if (toString.call(name) === objectType) {
-      if (fn) { throw new Exception('Arg not supported with multiple decorators'); }
+      if (fn) {
+        throw new Exception('Arg not supported with multiple decorators');
+      }
      extend(this.decorators, name);
    } else {
      this.decorators[name] = fn;
@@ -72,9 +79,16 @@ HandlebarsEnvironment.prototype = {
  },
  unregisterDecorator: function(name) {
    delete this.decorators[name];
+  },
+  /**
+   * Reset the memory of illegal property accesses that have already been logged.
+   * @deprecated should only be used in handlebars test-cases
+   */
+  resetLoggedPropertyAccesses() {
+    resetLoggedProperties();
  }
 };

 export let log = logger.log;

-export {createFrame, logger};
+export { createFrame, logger };
@@ -5,24 +5,28 @@ let AST = {
    // * it is an eligible helper, and
    // * it has at least one parameter or hash segment
    helperExpression: function(node) {
-      return (node.type === 'SubExpression')
-          || ((node.type === 'MustacheStatement' || node.type === 'BlockStatement')
-            && !!((node.params && node.params.length) || node.hash));
+      return (
+        node.type === 'SubExpression' ||
+        ((node.type === 'MustacheStatement' ||
+          node.type === 'BlockStatement') &&
+          !!((node.params && node.params.length) || node.hash))
+      );
    },

    scopedId: function(path) {
-      return (/^\.|this\b/).test(path.original);
+      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) {
-      return path.parts.length === 1 && !AST.helpers.scopedId(path) && !path.depth;
+      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
 // must modify the object to operate properly.
 export default AST;
@@ -10,7 +10,9 @@ extend(yy, Helpers);

 export function parseWithoutProcessing(input, options) {
  // Just return if an already-compiled AST was passed in.
-  if (input.type === 'Program') { return input; }
+  if (input.type === 'Program') {
+    return input;
+  }

  parser.yy = yy;

@@ -1,5 +1,5 @@
 /* global define */
-import {isArray} from '../utils';
+import { isArray } from '../utils';

 let SourceNode;

@@ -38,7 +38,7 @@ if (!SourceNode) {
      this.src = chunks + this.src;
    },
    toStringWithSourceMap: function() {
-      return {code: this.toString()};
+      return { code: this.toString() };
    },
    toString: function() {
      return this.src;
@@ -46,7 +46,6 @@ if (!SourceNode) {
  };
 }

-
 function castChunk(chunk, codeGen, loc) {
  if (isArray(chunk)) {
    let ret = [];
@@ -62,7 +61,6 @@ function castChunk(chunk, codeGen, loc) {
  return chunk;
 }

-
 function CodeGen(srcFile) {
  this.srcFile = srcFile;
  this.source = [];
@@ -94,17 +92,22 @@ CodeGen.prototype = {
  },

  empty: function() {
-    let loc = this.currentLocation || {start: {}};
+    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;
    }

    chunk = castChunk(chunk, this, loc);

-    return new SourceNode(loc.start.line, loc.start.column, this.srcFile, chunk);
+    return new SourceNode(
+      loc.start.line,
+      loc.start.column,
+      this.srcFile,
+      chunk
+    );
  },

  functionCall: function(fn, type, params) {
@@ -113,26 +116,28 @@ CodeGen.prototype = {
  },

  quotedString: function(str) {
-    return '"' + (str + '')
-      .replace(/\\/g, '\\\\')
-      .replace(/"/g, '\\"')
-      .replace(/\n/g, '\\n')
-      .replace(/\r/g, '\\r')
-      .replace(/\u2028/g, '\\u2028') // Per Ecma-262 7.3 + 7.8.4
-      .replace(/\u2029/g, '\\u2029') + '"';
+    return (
+      '"' +
+      (str + '')
+        .replace(/\\/g, '\\\\')
+        .replace(/"/g, '\\"')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/\u2028/g, '\\u2028') // Per Ecma-262 7.3 + 7.8.4
+        .replace(/\u2029/g, '\\u2029') +
+      '"'
+    );
  },

  objectLiteral: function(obj) {
    let pairs = [];

-    for (let key in obj) {
-      if (obj.hasOwnProperty(key)) {
-        let value = castChunk(obj[key], this);
-        if (value !== 'undefined') {
-          pairs.push([this.quotedString(key), ':', value]);
-        }
+    Object.keys(obj).forEach(key => {
+      let value = castChunk(obj[key], this);
+      if (value !== 'undefined') {
+        pairs.push([this.quotedString(key), ':', value]);
      }
-    }
+    });

    let ret = this.generateList(pairs);
    ret.prepend('{');
@@ -140,7 +145,6 @@ CodeGen.prototype = {
    return ret;
  },

-
  generateList: function(entries) {
    let ret = this.empty();

@@ -165,4 +169,3 @@ CodeGen.prototype = {
 };

 export default CodeGen;
-
@@ -1,7 +1,7 @@
 /* eslint-disable new-cap */

 import Exception from '../exception';
-import {isArray, indexOf, extend} from '../utils';
+import { isArray, indexOf, extend } from '../utils';
 import AST from './ast';

 const slice = [].slice;
@@ -24,8 +24,11 @@ Compiler.prototype = {

    for (let i = 0; i < len; i++) {
      let opcode = this.opcodes[i],
-          otherOpcode = other.opcodes[i];
-      if (opcode.opcode !== otherOpcode.opcode || !argEquals(opcode.args, otherOpcode.args)) {
+        otherOpcode = other.opcodes[i];
+      if (
+        opcode.opcode !== otherOpcode.opcode ||
+        !argEquals(opcode.args, otherOpcode.args)
+      ) {
        return false;
      }
    }
@@ -54,34 +57,28 @@ Compiler.prototype = {

    options.blockParams = options.blockParams || [];

-    // These changes will propagate to the other compiler components
-    let knownHelpers = options.knownHelpers;
-    options.knownHelpers = {
-      'helperMissing': true,
-      'blockHelperMissing': true,
-      'each': true,
-      'if': true,
-      'unless': true,
-      'with': true,
-      'log': true,
-      'lookup': true
-    };
-    if (knownHelpers) {
-      // the next line should use "Object.keys", but the code has been like this a long time and changing it, might
-      // cause backwards-compatibility issues... It's an old library...
-      // eslint-disable-next-line guard-for-in
-      for (let name in knownHelpers) {
-          this.options.knownHelpers[name] = knownHelpers[name];
-      }
-    }
+    options.knownHelpers = extend(
+      Object.create(null),
+      {
+        helperMissing: true,
+        blockHelperMissing: true,
+        each: true,
+        if: true,
+        unless: true,
+        with: true,
+        log: true,
+        lookup: true
+      },
+      options.knownHelpers
+    );

    return this.accept(program);
  },

  compileProgram: function(program) {
    let childCompiler = new this.compiler(), // eslint-disable-line new-cap
-        result = childCompiler.compile(program, this.options),
-        guid = this.guid++;
+      result = childCompiler.compile(program, this.options),
+      guid = this.guid++;

    this.usePartial = this.usePartial || result.usePartial;

@@ -107,7 +104,7 @@ Compiler.prototype = {
    this.options.blockParams.unshift(program.blockParams);

    let body = program.body,
-        bodyLength = body.length;
+      bodyLength = body.length;
    for (let i = 0; i < bodyLength; i++) {
      this.accept(body[i]);
    }
@@ -124,7 +121,7 @@ Compiler.prototype = {
    transformLiteralToPath(block);

    let program = block.program,
-        inverse = block.inverse;
+      inverse = block.inverse;

    program = program && this.compileProgram(program);
    inverse = inverse && this.compileProgram(inverse);
@@ -159,7 +156,7 @@ Compiler.prototype = {
  DecoratorBlock(decorator) {
    let program = decorator.program && this.compileProgram(decorator.program);
    let params = this.setupFullMustacheParams(decorator, program, undefined),
-        path = decorator.path;
+      path = decorator.path;

    this.useDecorators = true;
    this.opcode('registerDecorator', params.length, path.original);
@@ -175,17 +172,20 @@ Compiler.prototype = {

    let params = partial.params;
    if (params.length > 1) {
-      throw new Exception('Unsupported number of partial arguments: ' + params.length, partial);
+      throw new Exception(
+        'Unsupported number of partial arguments: ' + params.length,
+        partial
+      );
    } else if (!params.length) {
      if (this.options.explicitPartialContext) {
        this.opcode('pushLiteral', 'undefined');
      } else {
-        params.push({type: 'PathExpression', parts: [], depth: 0});
+        params.push({ type: 'PathExpression', parts: [], depth: 0 });
      }
    }

    let partialName = partial.name.original,
-        isDynamic = partial.name.type === 'SubExpression';
+      isDynamic = partial.name.type === 'SubExpression';
    if (isDynamic) {
      this.accept(partial.name);
    }
@@ -218,7 +218,6 @@ Compiler.prototype = {
    this.DecoratorBlock(decorator);
  },

-
  ContentStatement: function(content) {
    if (content.value) {
      this.opcode('appendContent', content.value);
@@ -241,8 +240,8 @@ Compiler.prototype = {
  },
  ambiguousSexpr: function(sexpr, program, inverse) {
    let path = sexpr.path,
-        name = path.parts[0],
-        isBlock = program != null || inverse != null;
+      name = path.parts[0],
+      isBlock = program != null || inverse != null;

    this.opcode('getContext', path.depth);

@@ -264,19 +263,27 @@ Compiler.prototype = {

  helperSexpr: function(sexpr, program, inverse) {
    let params = this.setupFullMustacheParams(sexpr, program, inverse),
-        path = sexpr.path,
-        name = path.parts[0];
+      path = sexpr.path,
+      name = path.parts[0];

    if (this.options.knownHelpers[name]) {
      this.opcode('invokeKnownHelper', params.length, name);
    } else if (this.options.knownHelpersOnly) {
-      throw new Exception('You specified knownHelpersOnly, but used the unknown helper ' + name, sexpr);
+      throw new Exception(
+        'You specified knownHelpersOnly, but used the unknown helper ' + name,
+        sexpr
+      );
    } else {
      path.strict = true;
      path.falsy = true;

      this.accept(path);
-      this.opcode('invokeHelper', params.length, path.original, AST.helpers.simpleId(path));
+      this.opcode(
+        'invokeHelper',
+        params.length,
+        path.original,
+        AST.helpers.simpleId(path)
+      );
    }
  },

@@ -285,8 +292,8 @@ Compiler.prototype = {
    this.opcode('getContext', path.depth);

    let name = path.parts[0],
-        scoped = AST.helpers.scopedId(path),
-        blockParamId = !path.depth && !scoped && this.blockParamIndex(name);
+      scoped = AST.helpers.scopedId(path),
+      blockParamId = !path.depth && !scoped && this.blockParamIndex(name);

    if (blockParamId) {
      this.opcode('lookupBlockParam', blockParamId, path.parts);
@@ -297,7 +304,13 @@ Compiler.prototype = {
      this.options.data = true;
      this.opcode('lookupData', path.depth, path.parts, path.strict);
    } else {
-      this.opcode('lookupOnContext', path.parts, path.falsy, path.strict, scoped);
+      this.opcode(
+        'lookupOnContext',
+        path.parts,
+        path.falsy,
+        path.strict,
+        scoped
+      );
    }
  },

@@ -323,8 +336,8 @@ Compiler.prototype = {

  Hash: function(hash) {
    let pairs = hash.pairs,
-        i = 0,
-        l = pairs.length;
+      i = 0,
+      l = pairs.length;

    this.opcode('pushHash');

@@ -339,7 +352,11 @@ Compiler.prototype = {

  // HELPERS
  opcode: function(name) {
-    this.opcodes.push({ opcode: name, args: slice.call(arguments, 1), loc: this.sourceNode[0].loc });
+    this.opcodes.push({
+      opcode: name,
+      args: slice.call(arguments, 1),
+      loc: this.sourceNode[0].loc
+    });
  },

  addDepth: function(depth) {
@@ -368,8 +385,7 @@ Compiler.prototype = {
    // An eligible helper is one that does not have a complex path, i.e. `this.foo`, `../foo` etc.
    if (isEligible && !isHelper) {
      let name = sexpr.path.parts[0],
-          options = this.options;
-
+        options = this.options;
      if (options.knownHelpers[name]) {
        isHelper = true;
      } else if (options.knownHelpersOnly) {
@@ -397,9 +413,7 @@ Compiler.prototype = {

    if (this.stringParams) {
      if (value.replace) {
-        value = value
-            .replace(/^(\.?\.\/)*/g, '')
-            .replace(/\//g, '.');
+        value = value.replace(/^(\.?\.\/)*/g, '').replace(/\//g, '.');
      }

      if (val.depth) {
@@ -417,7 +431,7 @@ Compiler.prototype = {
      if (this.trackIds) {
        let blockParamIndex;
        if (val.parts && !AST.helpers.scopedId(val) && !val.depth) {
-           blockParamIndex = this.blockParamIndex(val.parts[0]);
+          blockParamIndex = this.blockParamIndex(val.parts[0]);
        }
        if (blockParamIndex) {
          let blockParamChild = val.parts.slice(1).join('.');
@@ -426,9 +440,9 @@ Compiler.prototype = {
          value = val.original || value;
          if (value.replace) {
            value = value
-                .replace(/^this(?:\.|$)/, '')
-                .replace(/^\.\//, '')
-                .replace(/^\.$/, '');
+              .replace(/^this(?:\.|$)/, '')
+              .replace(/^\.\//, '')
+              .replace(/^\.$/, '');
          }

          this.opcode('pushId', val.type, value);
@@ -455,9 +469,13 @@ Compiler.prototype = {
  },

  blockParamIndex: function(name) {
-    for (let depth = 0, len = this.options.blockParams.length; depth < len; depth++) {
+    for (
+      let depth = 0, len = this.options.blockParams.length;
+      depth < len;
+      depth++
+    ) {
      let blockParams = this.options.blockParams[depth],
-          param = blockParams && indexOf(blockParams, name);
+        param = blockParams && indexOf(blockParams, name);
      if (blockParams && param >= 0) {
        return [depth, param];
      }
@@ -466,8 +484,14 @@ Compiler.prototype = {
 };

 export function precompile(input, options, env) {
-  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);
+  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
+    );
  }

  options = options || {};
@@ -479,13 +503,19 @@ export function precompile(input, options, env) {
  }

  let ast = env.parse(input, options),
-      environment = new env.Compiler().compile(ast, options);
+    environment = new env.Compiler().compile(ast, options);
  return new env.JavaScriptCompiler().compile(environment, options);
 }

 export function compile(input, options = {}, env) {
-  if (input == null || (typeof input !== 'string' && input.type !== 'Program')) {
-    throw new Exception('You must pass a string or Handlebars AST to Handlebars.compile. You passed ' + input);
+  if (
+    input == null ||
+    (typeof input !== 'string' && input.type !== 'Program')
+  ) {
+    throw new Exception(
+      'You must pass a string or Handlebars AST to Handlebars.compile. You passed ' +
+        input
+    );
  }

  options = extend({}, options);
@@ -500,8 +530,13 @@ export function compile(input, options = {}, env) {

  function compileInput() {
    let ast = env.parse(input, options),
-        environment = new env.Compiler().compile(ast, options),
-        templateSpec = new env.JavaScriptCompiler().compile(environment, options, undefined, true);
+      environment = new env.Compiler().compile(ast, options),
+      templateSpec = new env.JavaScriptCompiler().compile(
+        environment,
+        options,
+        undefined,
+        true
+      );
    return env.template(templateSpec);
  }

@@ -4,9 +4,12 @@ function validateClose(open, close) {
  close = close.path ? close.path.original : close;

  if (open.path.original !== close) {
-    let errorNode = {loc: open.path.loc};
+    let errorNode = { loc: open.path.loc };

-    throw new Exception(open.path.original + " doesn't match " + close, errorNode);
+    throw new Exception(
+      open.path.original + " doesn't match " + close,
+      errorNode
+    );
  }
 }

@@ -38,27 +41,26 @@ export function stripFlags(open, close) {
 }

 export function stripComment(comment) {
-  return comment.replace(/^\{\{~?!-?-?/, '')
-                .replace(/-?-?~?\}\}$/, '');
+  return comment.replace(/^\{\{~?!-?-?/, '').replace(/-?-?~?\}\}$/, '');
 }

 export function preparePath(data, parts, loc) {
  loc = this.locInfo(loc);

  let original = data ? '@' : '',
-      dig = [],
-      depth = 0;
+    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;
+      // 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});
+        throw new Exception('Invalid path: ' + original, { loc });
      } else if (part === '..') {
        depth++;
      }
@@ -80,9 +82,9 @@ export function preparePath(data, parts, 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 !== '&';
+    escaped = escapeFlag !== '{' && escapeFlag !== '&';

-  let decorator = (/\*/.test(open));
+  let decorator = /\*/.test(open);
  return {
    type: decorator ? 'Decorator' : 'MustacheStatement',
    path,
@@ -118,21 +120,30 @@ export function prepareRawBlock(openRawBlock, contents, close, locInfo) {
  };
 }

-export function prepareBlock(openBlock, program, inverseAndProgram, close, inverted, locInfo) {
+export function prepareBlock(
+  openBlock,
+  program,
+  inverseAndProgram,
+  close,
+  inverted,
+  locInfo
+) {
  if (close && close.path) {
    validateClose(openBlock, close);
  }

-  let decorator = (/\*/.test(openBlock.open));
+  let decorator = /\*/.test(openBlock.open);

  program.blockParams = openBlock.blockParams;

-  let inverse,
-      inverseStrip;
+  let inverse, inverseStrip;

  if (inverseAndProgram) {
    if (decorator) {
-      throw new Exception('Unexpected inverse block on decorator', inverseAndProgram);
+      throw new Exception(
+        'Unexpected inverse block on decorator',
+        inverseAndProgram
+      );
    }

    if (inverseAndProgram.chain) {
@@ -166,7 +177,7 @@ export function prepareBlock(openBlock, program, inverseAndProgram, close, inver
 export function prepareProgram(statements, loc) {
  if (!loc && statements.length) {
    const firstLoc = statements[0].loc,
-          lastLoc = statements[statements.length - 1].loc;
+      lastLoc = statements[statements.length - 1].loc;

    /* istanbul ignore else */
    if (firstLoc && lastLoc) {
@@ -192,7 +203,6 @@ export function prepareProgram(statements, loc) {
  };
 }

-
 export function preparePartialBlock(open, program, close, locInfo) {
  validateClose(open, close);

@@ -207,4 +217,3 @@ export function preparePartialBlock(open, program, close, locInfo) {
    loc: this.locInfo(locInfo)
  };
 }
-
@@ -1,6 +1,6 @@
 import { COMPILER_REVISION, REVISION_CHANGES } from '../base';
 import Exception from '../exception';
-import {isArray} from '../utils';
+import { isArray } from '../utils';
 import CodeGen from './code-gen';

 function Literal(value) {
@@ -12,21 +12,8 @@ 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*/) {
-    const isEnumerable = [ this.aliasable('container.propertyIsEnumerable'), '.call(', parent, ',"constructor")'];
-
-    if (name === 'constructor') {
-      return ['(', isEnumerable, '?', _actualLookup(), ' : undefined)'];
-    }
-    return _actualLookup();
-
-    function _actualLookup() {
-      if (JavaScriptCompiler.isValidJavaScriptVariableName(name)) {
-        return [parent, '.', name];
-      } else {
-        return [parent, '[', JSON.stringify(name), ']'];
-      }
-    }
+  nameLookup: function(parent, name /*,  type */) {
+    return this.internalNameLookup(parent, name);
  },
  depthedLookup: function(name) {
    return [this.aliasable('container.lookup'), '(depths, "', name, '")'];
@@ -34,7 +21,7 @@ JavaScriptCompiler.prototype = {

  compilerInfo: function() {
    const revision = COMPILER_REVISION,
-          versions = REVISION_CHANGES[revision];
+      versions = REVISION_CHANGES[revision];
    return [revision, versions];
  },

@@ -62,6 +49,12 @@ JavaScriptCompiler.prototype = {
    return this.quotedString('');
  },
  // END PUBLIC API
+  internalNameLookup: function(parent, name) {
+    this.lookupPropertyFunctionIsUsed = true;
+    return ['lookupProperty(', parent, ',', JSON.stringify(name), ')'];
+  },
+
+  lookupPropertyFunctionIsUsed: false,

  compile: function(environment, options, context, asObject) {
    this.environment = environment;
@@ -91,14 +84,18 @@ JavaScriptCompiler.prototype = {

    this.compileChildren(environment, options);

-    this.useDepths = this.useDepths || environment.useDepths || environment.useDecorators || this.options.compat;
+    this.useDepths =
+      this.useDepths ||
+      environment.useDepths ||
+      environment.useDecorators ||
+      this.options.compat;
    this.useBlockParams = this.useBlockParams || environment.useBlockParams;

    let opcodes = environment.opcodes,
-        opcode,
-        firstLoc,
-        i,
-        l;
+      opcode,
+      firstLoc,
+      i,
+      l;

    for (i = 0, l = opcodes.length; i < l; i++) {
      opcode = opcodes[i];
@@ -120,13 +117,28 @@ JavaScriptCompiler.prototype = {
    if (!this.decorators.isEmpty()) {
      this.useDecorators = true;

-      this.decorators.prepend('var decorators = container.decorators;\n');
+      this.decorators.prepend([
+        'var decorators = container.decorators, ',
+        this.lookupPropertyFunctionVarDeclaration(),
+        ';\n'
+      ]);
      this.decorators.push('return fn;');

      if (asObject) {
-        this.decorators = Function.apply(this, ['fn', 'props', 'container', 'depth0', 'data', 'blockParams', 'depths', this.decorators.merge()]);
+        this.decorators = Function.apply(this, [
+          'fn',
+          'props',
+          'container',
+          'depth0',
+          'data',
+          'blockParams',
+          'depths',
+          this.decorators.merge()
+        ]);
      } else {
-        this.decorators.prepend('function(fn, props, container, depth0, data, blockParams, depths) {\n');
+        this.decorators.prepend(
+          'function(fn, props, container, depth0, data, blockParams, depths) {\n'
+        );
        this.decorators.push('}\n');
        this.decorators = this.decorators.merge();
      }
@@ -146,7 +158,7 @@ JavaScriptCompiler.prototype = {
        ret.useDecorators = true;
      }

-      let {programs, decorators} = this.context;
+      let { programs, decorators } = this.context;
      for (i = 0, l = programs.length; i < l; i++) {
        if (programs[i]) {
          ret[i] = programs[i];
@@ -176,11 +188,11 @@ JavaScriptCompiler.prototype = {
      if (!asObject) {
        ret.compiler = JSON.stringify(ret.compiler);

-        this.source.currentLocation = {start: {line: 1, column: 0}};
+        this.source.currentLocation = { start: { line: 1, column: 0 } };
        ret = this.objectLiteral(ret);

        if (options.srcName) {
-          ret = ret.toStringWithSourceMap({file: options.destName});
+          ret = ret.toStringWithSourceMap({ file: options.destName });
          ret.map = ret.map && ret.map.toString();
        } else {
          ret = ret.toString();
@@ -218,12 +230,16 @@ 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;
-    for (let alias in this.aliases) { // eslint-disable-line guard-for-in
+    Object.keys(this.aliases).forEach(alias => {
      let node = this.aliases[alias];
-      if (this.aliases.hasOwnProperty(alias) && node.children && node.referenceCount > 1) {
-        varDeclarations += ', alias' + (++aliasCount) + '=' + alias;
+      if (node.children && node.referenceCount > 1) {
+        varDeclarations += ', alias' + ++aliasCount + '=' + alias;
        node.children[0] = 'alias' + aliasCount;
      }
+    });
+
+    if (this.lookupPropertyFunctionIsUsed) {
+      varDeclarations += ', ' + this.lookupPropertyFunctionVarDeclaration();
    }

    let params = ['container', 'depth0', 'helpers', 'partials', 'data'];
@@ -243,18 +259,23 @@ JavaScriptCompiler.prototype = {

      return Function.apply(this, params);
    } else {
-      return this.source.wrap(['function(', params.join(','), ') {\n  ', source, '}']);
+      return this.source.wrap([
+        'function(',
+        params.join(','),
+        ') {\n  ',
+        source,
+        '}'
+      ]);
    }
  },
  mergeSource: function(varDeclarations) {
    let isSimple = this.environment.isSimple,
-        appendOnly = !this.forceBuffer,
-        appendFirst,
-
-        sourceSeen,
-        bufferStart,
-        bufferEnd;
-    this.source.each((line) => {
+      appendOnly = !this.forceBuffer,
+      appendFirst,
+      sourceSeen,
+      bufferStart,
+      bufferEnd;
+    this.source.each(line => {
      if (line.appendToBuffer) {
        if (bufferStart) {
          line.prepend('  + ');
@@ -280,7 +301,6 @@ JavaScriptCompiler.prototype = {
      }
    });

-
    if (appendOnly) {
      if (bufferStart) {
        bufferStart.prepend('return ');
@@ -289,7 +309,8 @@ JavaScriptCompiler.prototype = {
        this.source.push('return "";');
      }
    } else {
-      varDeclarations += ', buffer = ' + (appendFirst ? '' : this.initializeBuffer());
+      varDeclarations +=
+        ', buffer = ' + (appendFirst ? '' : this.initializeBuffer());

      if (bufferStart) {
        bufferStart.prepend('return buffer + ');
@@ -300,12 +321,25 @@ JavaScriptCompiler.prototype = {
    }

    if (varDeclarations) {
-      this.source.prepend('var ' + varDeclarations.substring(2) + (appendFirst ? '' : ';\n'));
+      this.source.prepend(
+        'var ' + varDeclarations.substring(2) + (appendFirst ? '' : ';\n')
+      );
    }

    return this.source.merge();
  },

+  lookupPropertyFunctionVarDeclaration: function() {
+    return `
+      lookupProperty = container.lookupProperty || function(parent, propertyName) {
+        if (Object.prototype.hasOwnProperty.call(parent, propertyName)) {
+          return parent[propertyName];
+        }
+        return undefined
+    }
+    `.trim();
+  },
+
  // [blockValue]
  //
  // On stack, before: hash, inverse, program, value
@@ -316,8 +350,10 @@ JavaScriptCompiler.prototype = {
  // replace it on the stack with the result of properly
  // invoking blockHelperMissing.
  blockValue: function(name) {
-    let blockHelperMissing = this.aliasable('container.hooks.blockHelperMissing'),
-        params = [this.contextName(0)];
+    let blockHelperMissing = this.aliasable(
+        'container.hooks.blockHelperMissing'
+      ),
+      params = [this.contextName(0)];
    this.setupHelperArgs(name, 0, params);

    let blockName = this.popStack();
@@ -334,8 +370,10 @@ JavaScriptCompiler.prototype = {
  // On stack, after, if lastHelper: value
  ambiguousBlockValue: function() {
    // We're being a bit cheeky and reusing the options value from the prior exec
-    let blockHelperMissing = this.aliasable('container.hooks.blockHelperMissing'),
-        params = [this.contextName(0)];
+    let blockHelperMissing = this.aliasable(
+        'container.hooks.blockHelperMissing'
+      ),
+      params = [this.contextName(0)];
    this.setupHelperArgs('', 0, params, true);

    this.flushInline();
@@ -344,9 +382,14 @@ JavaScriptCompiler.prototype = {
    params.splice(1, 0, current);

    this.pushSource([
-      'if (!', this.lastHelper, ') { ',
-      current, ' = ', this.source.functionCall(blockHelperMissing, 'call', params),
-      '}']);
+      'if (!',
+      this.lastHelper,
+      ') { ',
+      current,
+      ' = ',
+      this.source.functionCall(blockHelperMissing, 'call', params),
+      '}'
+    ]);
  },

  // [appendContent]
@@ -376,14 +419,24 @@ JavaScriptCompiler.prototype = {
  // Otherwise, the empty string is appended
  append: function() {
    if (this.isInline()) {
-      this.replaceStack((current) => [' != null ? ', current, ' : ""']);
+      this.replaceStack(current => [' != null ? ', current, ' : ""']);

      this.pushSource(this.appendToBuffer(this.popStack()));
    } else {
      let local = this.popStack();
-      this.pushSource(['if (', local, ' != null) { ', this.appendToBuffer(local, undefined, true), ' }']);
+      this.pushSource([
+        'if (',
+        local,
+        ' != null) { ',
+        this.appendToBuffer(local, undefined, true),
+        ' }'
+      ]);
      if (this.environment.isSimple) {
-        this.pushSource(['else { ', this.appendToBuffer("''", undefined, true), ' }']);
+        this.pushSource([
+          'else { ',
+          this.appendToBuffer("''", undefined, true),
+          ' }'
+        ]);
      }
    }
  },
@@ -395,8 +448,14 @@ JavaScriptCompiler.prototype = {
  //
  // Escape `value` and append it to the buffer
  appendEscaped: function() {
-    this.pushSource(this.appendToBuffer(
-        [this.aliasable('container.escapeExpression'), '(', this.popStack(), ')']));
+    this.pushSource(
+      this.appendToBuffer([
+        this.aliasable('container.escapeExpression'),
+        '(',
+        this.popStack(),
+        ')'
+      ])
+    );
  },

  // [getContext]
@@ -480,7 +539,7 @@ JavaScriptCompiler.prototype = {
    let len = parts.length;
    for (; 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.
@@ -503,7 +562,14 @@ JavaScriptCompiler.prototype = {
  // If the `value` is a lambda, replace it on the stack by
  // the return value of the lambda
  resolvePossibleLambda: function() {
-    this.push([this.aliasable('container.lambda'), '(', this.popStack(), ', ', this.contextName(0), ')']);
+    this.push([
+      this.aliasable('container.lambda'),
+      '(',
+      this.popStack(),
+      ', ',
+      this.contextName(0),
+      ')'
+    ]);
  },

  // [pushStringParam]
@@ -543,7 +609,7 @@ JavaScriptCompiler.prototype = {
    if (this.hash) {
      this.hashes.push(this.hash);
    }
-    this.hash = {values: {}, types: [], contexts: [], ids: []};
+    this.hash = { values: {}, types: [], contexts: [], ids: [] };
  },
  popHash: function() {
    let hash = this.hash;
@@ -607,11 +673,16 @@ JavaScriptCompiler.prototype = {
  // and inserts the decorator into the decorators list.
  registerDecorator(paramSize, name) {
    let foundDecorator = this.nameLookup('decorators', name, 'decorator'),
-        options = this.setupHelperArgs(name, paramSize);
+      options = this.setupHelperArgs(name, paramSize);

    this.decorators.push([
      'fn = ',
-      this.decorators.functionCall(foundDecorator, '', ['fn', 'props', 'container', options]),
+      this.decorators.functionCall(foundDecorator, '', [
+        'fn',
+        'props',
+        'container',
+        options
+      ]),
      ' || fn;'
    ]);
  },
@@ -627,21 +698,32 @@ JavaScriptCompiler.prototype = {
  // If the helper is not found, `helperMissing` is called.
  invokeHelper: function(paramSize, name, isSimple) {
    let nonHelper = this.popStack(),
-        helper = this.setupHelper(paramSize, name);
+      helper = this.setupHelper(paramSize, name);

    let possibleFunctionCalls = [];

-    if (isSimple) { // direct call to helper
+    if (isSimple) {
+      // direct call to helper
      possibleFunctionCalls.push(helper.name);
    }
    // call a function from the input object
    possibleFunctionCalls.push(nonHelper);
    if (!this.options.strict) {
-      possibleFunctionCalls.push(this.aliasable('container.hooks.helperMissing'));
+      possibleFunctionCalls.push(
+        this.aliasable('container.hooks.helperMissing')
+      );
    }

-    let functionLookupCode = ['(', this.itemsSeparatedBy(possibleFunctionCalls, '||'), ')'];
-    let functionCall = this.source.functionCall(functionLookupCode, 'call', helper.callParams);
+    let functionLookupCode = [
+      '(',
+      this.itemsSeparatedBy(possibleFunctionCalls, '||'),
+      ')'
+    ];
+    let functionCall = this.source.functionCall(
+      functionLookupCode,
+      'call',
+      helper.callParams
+    );
    this.push(functionCall);
  },

@@ -685,22 +767,31 @@ JavaScriptCompiler.prototype = {
    this.emptyHash();
    let helper = this.setupHelper(0, name, helperCall);

-    let helperName = this.lastHelper = this.nameLookup('helpers', name, 'helper');
+    let helperName = (this.lastHelper = this.nameLookup(
+      'helpers',
+      name,
+      'helper'
+    ));

    let lookup = ['(', '(helper = ', helperName, ' || ', nonHelper, ')'];
    if (!this.options.strict) {
      lookup[0] = '(helper = ';
      lookup.push(
-          ' != null ? helper : ',
-          this.aliasable('container.hooks.helperMissing')
+        ' != null ? helper : ',
+        this.aliasable('container.hooks.helperMissing')
      );
    }

    this.push([
-      '(', lookup,
-      (helper.paramsInit ? ['),(', helper.paramsInit] : []), '),',
-      '(typeof helper === ', this.aliasable('"function"'), ' ? ',
-      this.source.functionCall('helper', 'call', helper.callParams), ' : helper))'
+      '(',
+      lookup,
+      helper.paramsInit ? ['),(', helper.paramsInit] : [],
+      '),',
+      '(typeof helper === ',
+      this.aliasable('"function"'),
+      ' ? ',
+      this.source.functionCall('helper', 'call', helper.callParams),
+      ' : helper))'
    ]);
  },

@@ -713,7 +804,7 @@ JavaScriptCompiler.prototype = {
  // and pushes the result of the invocation back.
  invokePartial: function(isDynamic, name, indent) {
    let params = [],
-        options = this.setupParams(name, 1, params);
+      options = this.setupParams(name, 1, params);

    if (isDynamic) {
      name = this.popStack();
@@ -750,9 +841,9 @@ JavaScriptCompiler.prototype = {
  // Pops a value off the stack and assigns it to the current hash
  assignToHash: function(key) {
    let value = this.popStack(),
-        context,
-        type,
-        id;
+      context,
+      type,
+      id;

    if (this.trackIds) {
      id = this.popStack();
@@ -778,8 +869,13 @@ JavaScriptCompiler.prototype = {
  pushId: function(type, name, child) {
    if (type === 'BlockParam') {
      this.pushStackLiteral(
-          'blockParams[' + name[0] + '].path[' + name[1] + ']'
-          + (child ? ' + ' + JSON.stringify('.' + child) : ''));
+        'blockParams[' +
+          name[0] +
+          '].path[' +
+          name[1] +
+          ']' +
+          (child ? ' + ' + JSON.stringify('.' + child) : '')
+      );
    } else if (type === 'PathExpression') {
      this.pushString(name);
    } else if (type === 'SubExpression') {
@@ -794,7 +890,9 @@ JavaScriptCompiler.prototype = {
  compiler: JavaScriptCompiler,

  compileChildren: function(environment, options) {
-    let children = environment.children, child, compiler;
+    let children = environment.children,
+      child,
+      compiler;

    for (let i = 0, l = children.length; i < l; i++) {
      child = children[i];
@@ -807,7 +905,12 @@ JavaScriptCompiler.prototype = {
        let index = this.context.programs.length;
        child.index = index;
        child.name = 'program' + index;
-        this.context.programs[index] = compiler.compile(child, options, this.context, !this.precompile);
+        this.context.programs[index] = compiler.compile(
+          child,
+          options,
+          this.context,
+          !this.precompile
+        );
        this.context.decorators[index] = compiler.decorators;
        this.context.environments[index] = child;

@@ -835,7 +938,7 @@ JavaScriptCompiler.prototype = {

  programExpression: function(guid) {
    let child = this.environment.children[guid],
-        programParams = [child.index, 'data', child.blockParams];
+      programParams = [child.index, 'data', child.blockParams];

    if (this.useBlockParams || this.useDepths) {
      programParams.push('blockParams');
@@ -870,7 +973,11 @@ JavaScriptCompiler.prototype = {
  pushSource: function(source) {
    if (this.pendingContent) {
      this.source.push(
-          this.appendToBuffer(this.source.quotedString(this.pendingContent), this.pendingLocation));
+        this.appendToBuffer(
+          this.source.quotedString(this.pendingContent),
+          this.pendingLocation
+        )
+      );
      this.pendingContent = undefined;
    }

@@ -881,9 +988,9 @@ JavaScriptCompiler.prototype = {

  replaceStack: function(callback) {
    let prefix = ['('],
-        stack,
-        createdStack,
-        usedLiteral;
+      stack,
+      createdStack,
+      usedLiteral;

    /* istanbul ignore next */
    if (!this.isInline()) {
@@ -920,7 +1027,9 @@ JavaScriptCompiler.prototype = {

  incrStack: function() {
    this.stackSlot++;
-    if (this.stackSlot > this.stackVars.length) { this.stackVars.push('stack' + this.stackSlot); }
+    if (this.stackSlot > this.stackVars.length) {
+      this.stackVars.push('stack' + this.stackSlot);
+    }
    return this.topStackName();
  },
  topStackName: function() {
@@ -947,9 +1056,9 @@ JavaScriptCompiler.prototype = {

  popStack: function(wrapped) {
    let inline = this.isInline(),
-        item = (inline ? this.inlineStack : this.compileStack).pop();
+      item = (inline ? this.inlineStack : this.compileStack).pop();

-    if (!wrapped && (item instanceof Literal)) {
+    if (!wrapped && item instanceof Literal) {
      return item.value;
    } else {
      if (!inline) {
@@ -964,8 +1073,8 @@ JavaScriptCompiler.prototype = {
  },

  topStack: function() {
-    let stack = (this.isInline() ? this.inlineStack : this.compileStack),
-        item = stack[stack.length - 1];
+    let stack = this.isInline() ? this.inlineStack : this.compileStack,
+      item = stack[stack.length - 1];

    /* istanbul ignore if */
    if (item instanceof Literal) {
@@ -1007,9 +1116,13 @@ JavaScriptCompiler.prototype = {

  setupHelper: function(paramSize, name, blockHelper) {
    let params = [],
-        paramsInit = this.setupHelperArgs(name, paramSize, params, blockHelper);
+      paramsInit = this.setupHelperArgs(name, paramSize, params, blockHelper);
    let foundHelper = this.nameLookup('helpers', name, 'helper'),
-        callContext = this.aliasable(`${this.contextName(0)} != null ? ${this.contextName(0)} : (container.nullContext || {})`);
+      callContext = this.aliasable(
+        `${this.contextName(0)} != null ? ${this.contextName(
+          0
+        )} : (container.nullContext || {})`
+      );

    return {
      params: params,
@@ -1021,11 +1134,11 @@ JavaScriptCompiler.prototype = {

  setupParams: function(helper, paramSize, params) {
    let options = {},
-        contexts = [],
-        types = [],
-        ids = [],
-        objectArgs = !params,
-        param;
+      contexts = [],
+      types = [],
+      ids = [],
+      objectArgs = !params,
+      param;

    if (objectArgs) {
      params = [];
@@ -1043,7 +1156,7 @@ JavaScriptCompiler.prototype = {
    }

    let inverse = this.popStack(),
-        program = this.popStack();
+      program = this.popStack();

    // Avoid setting fn and inverse if neither are set. This allows
    // helpers to do a check for `if (options.fn)`
@@ -1106,7 +1219,6 @@ JavaScriptCompiler.prototype = {
  }
 };

-
 (function() {
  const reservedWords = (
    'break else new var' +
@@ -1127,21 +1239,27 @@ JavaScriptCompiler.prototype = {
    ' null true false'
  ).split(' ');

-  const compilerWords = JavaScriptCompiler.RESERVED_WORDS = {};
+  const compilerWords = (JavaScriptCompiler.RESERVED_WORDS = {});

  for (let i = 0, l = reservedWords.length; i < l; i++) {
    compilerWords[reservedWords[i]] = true;
  }
-}());
+})();

+/**
+ * @deprecated May be removed in the next major version
+ */
 JavaScriptCompiler.isValidJavaScriptVariableName = function(name) {
-  return !JavaScriptCompiler.RESERVED_WORDS[name] && (/^[a-zA-Z_$][0-9a-zA-Z_$]*$/).test(name);
+  return (
+    !JavaScriptCompiler.RESERVED_WORDS[name] &&
+    /^[a-zA-Z_$][0-9a-zA-Z_$]*$/.test(name)
+  );
 };

 function strictLookup(requireTerminal, compiler, parts, type) {
  let stack = compiler.popStack(),
-      i = 0,
-      len = parts.length;
+    i = 0,
+    len = parts.length;
  if (requireTerminal) {
    len--;
  }
@@ -1151,7 +1269,16 @@ function strictLookup(requireTerminal, compiler, parts, type) {
  }

  if (requireTerminal) {
-    return [compiler.aliasable('container.strict'), '(', stack, ', ', compiler.quotedString(parts[i]), ', ', JSON.stringify(compiler.source.currentLocation), ' )'];
+    return [
+      compiler.aliasable('container.strict'),
+      '(',
+      stack,
+      ', ',
+      compiler.quotedString(parts[i]),
+      ', ',
+      JSON.stringify(compiler.source.currentLocation),
+      ' )'
+    ];
  } else {
    return stack;
  }
@@ -24,13 +24,14 @@ PrintVisitor.prototype.pad = function(string) {

 PrintVisitor.prototype.Program = function(program) {
  let out = '',
-      body = program.body,
-      i, l;
+    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 += ' ' + program.blockParams[i];
    }
    blockParams += ' ]';
    out += this.pad(blockParams);
@@ -52,11 +53,14 @@ PrintVisitor.prototype.Decorator = function(mustache) {
  return this.pad('{{ DIRECTIVE ' + this.SubExpression(mustache) + ' }}');
 };

-PrintVisitor.prototype.BlockStatement =
-PrintVisitor.prototype.DecoratorBlock = function(block) {
+PrintVisitor.prototype.BlockStatement = PrintVisitor.prototype.DecoratorBlock = function(
+  block
+) {
  let out = '';

-  out += this.pad((block.type === 'DecoratorBlock' ? 'DIRECTIVE ' : '') + 'BLOCK:');
+  out += this.pad(
+    (block.type === 'DecoratorBlock' ? 'DIRECTIVE ' : '') + 'BLOCK:'
+  );
  this.padding++;
  out += this.pad(this.SubExpression(block));
  if (block.program) {
@@ -66,12 +70,16 @@ PrintVisitor.prototype.DecoratorBlock = function(block) {
    this.padding--;
  }
  if (block.inverse) {
-    if (block.program) { this.padding++; }
+    if (block.program) {
+      this.padding++;
+    }
    out += this.pad('{{^}}');
    this.padding++;
    out += this.accept(block.inverse);
    this.padding--;
-    if (block.program) { this.padding--; }
+    if (block.program) {
+      this.padding--;
+    }
  }
  this.padding--;

@@ -115,8 +123,8 @@ PrintVisitor.prototype.CommentStatement = function(comment) {

 PrintVisitor.prototype.SubExpression = function(sexpr) {
  let params = sexpr.params,
-      paramStrings = [],
-      hash;
+    paramStrings = [],
+    hash;

  for (let i = 0, l = params.length; i < l; i++) {
    paramStrings.push(this.accept(params[i]));
@@ -134,7 +142,6 @@ PrintVisitor.prototype.PathExpression = function(id) {
  return (id.data ? '@' : '') + 'PATH:' + path;
 };

-
 PrintVisitor.prototype.StringLiteral = function(string) {
  return '"' + string.value + '"';
 };
@@ -157,7 +164,7 @@ PrintVisitor.prototype.NullLiteral = function() {

 PrintVisitor.prototype.Hash = function(hash) {
  let pairs = hash.pairs,
-      joinedPairs = [];
+    joinedPairs = [];

  for (let i = 0, l = pairs.length; i < l; i++) {
    joinedPairs.push(this.accept(pairs[i]));
@@ -15,7 +15,14 @@ Visitor.prototype = {
      // 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);
+        throw new Exception(
+          'Unexpected node type "' +
+            value.type +
+            '" found when accepting ' +
+            name +
+            ' on ' +
+            node.type
+        );
      }
      node[name] = value;
    }
@@ -14,18 +14,18 @@ WhitespaceControl.prototype.Program = function(program) {
  let body = program.body;
  for (let i = 0, l = body.length; i < l; i++) {
    let current = body[i],
-        strip = this.accept(current);
+      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;
+      _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);
@@ -41,7 +41,7 @@ WhitespaceControl.prototype.Program = function(program) {
        // 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]+$)/).exec(body[i - 1].original)[1];
+          current.indent = /([ \t]+$)/.exec(body[i - 1].original)[1];
        }
      }
    }
@@ -62,17 +62,17 @@ WhitespaceControl.prototype.Program = function(program) {
  return program;
 };

-WhitespaceControl.prototype.BlockStatement =
-WhitespaceControl.prototype.DecoratorBlock =
-WhitespaceControl.prototype.PartialBlockStatement = function(block) {
+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;
+    inverse = block.program && block.inverse,
+    firstInverse = inverse,
+    lastInverse = inverse;

  if (inverse && inverse.chained) {
    firstInverse = inverse.body[0].program;
@@ -112,9 +112,11 @@ WhitespaceControl.prototype.PartialBlockStatement = function(block) {
    }

    // Find standalone else statments
-    if (!this.options.ignoreStandalone
-        && isPrevWhitespace(program.body)
-        && isNextWhitespace(firstInverse.body)) {
+    if (
+      !this.options.ignoreStandalone &&
+      isPrevWhitespace(program.body) &&
+      isNextWhitespace(firstInverse.body)
+    ) {
      omitLeft(program.body);
      omitRight(firstInverse.body);
    }
@@ -125,13 +127,15 @@ WhitespaceControl.prototype.PartialBlockStatement = function(block) {
  return strip;
 };

-WhitespaceControl.prototype.Decorator =
-WhitespaceControl.prototype.MustacheStatement = function(mustache) {
+WhitespaceControl.prototype.Decorator = WhitespaceControl.prototype.MustacheStatement = function(
+  mustache
+) {
  return mustache.strip;
 };

-WhitespaceControl.prototype.PartialStatement =
-    WhitespaceControl.prototype.CommentStatement = function(node) {
+WhitespaceControl.prototype.PartialStatement = WhitespaceControl.prototype.CommentStatement = function(
+  node
+) {
  /* istanbul ignore next */
  let strip = node.strip || {};
  return {
@@ -141,7 +145,6 @@ WhitespaceControl.prototype.PartialStatement =
  };
 };

-
 function isPrevWhitespace(body, i, isRoot) {
  if (i === undefined) {
    i = body.length;
@@ -150,13 +153,15 @@ function isPrevWhitespace(body, i, isRoot) {
  // Nodes that end with newlines are considered whitespace (but are special
  // cased for strip operations)
  let prev = body[i - 1],
-      sibling = body[i - 2];
+    sibling = body[i - 2];
  if (!prev) {
    return isRoot;
  }

  if (prev.type === 'ContentStatement') {
-    return (sibling || !isRoot ? (/\r?\n\s*?$/) : (/(^|\r?\n)\s*?$/)).test(prev.original);
+    return (sibling || !isRoot ? /\r?\n\s*?$/ : /(^|\r?\n)\s*?$/).test(
+      prev.original
+    );
  }
 }
 function isNextWhitespace(body, i, isRoot) {
@@ -165,13 +170,15 @@ function isNextWhitespace(body, i, isRoot) {
  }

  let next = body[i + 1],
-      sibling = body[i + 2];
+    sibling = body[i + 2];
  if (!next) {
    return isRoot;
  }

  if (next.type === 'ContentStatement') {
-    return (sibling || !isRoot ? (/^\s*?\r?\n/) : (/^\s*?(\r?\n|$)/)).test(next.original);
+    return (sibling || !isRoot ? /^\s*?\r?\n/ : /^\s*?(\r?\n|$)/).test(
+      next.original
+    );
  }
 }

@@ -184,12 +191,19 @@ function isNextWhitespace(body, i, isRoot) {
 // content is met.
 function omitRight(body, i, multiple) {
  let current = body[i == null ? 0 : i + 1];
-  if (!current || current.type !== 'ContentStatement' || (!multiple && current.rightStripped)) {
+  if (
+    !current ||
+    current.type !== 'ContentStatement' ||
+    (!multiple && current.rightStripped)
+  ) {
    return;
  }

  let original = current.value;
-  current.value = current.value.replace(multiple ? (/^\s+/) : (/^[ \t]*\r?\n?/), '');
+  current.value = current.value.replace(
+    multiple ? /^\s+/ : /^[ \t]*\r?\n?/,
+    ''
+  );
  current.rightStripped = current.value !== original;
 }

@@ -202,13 +216,17 @@ function omitRight(body, i, multiple) {
 // 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)) {
+  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.value = current.value.replace(multiple ? /\s+$/ : /[ \t]+$/, '');
  current.leftStripped = current.value !== original;
  return current.leftStripped;
 }
@@ -3,4 +3,3 @@ import registerInline from './decorators/inline';
 export function registerDefaultDecorators(instance) {
  registerInline(instance);
 }
-
@@ -1,4 +1,4 @@
-import {extend} from '../utils';
+import { extend } from '../utils';

 export default function(instance) {
  instance.registerDecorator('inline', function(fn, props, container, options) {
@@ -1,12 +1,20 @@
-
-const errorProps = ['description', 'fileName', 'lineNumber', 'endLineNumber', 'message', 'name', 'number', 'stack'];
+const errorProps = [
+  'description',
+  'fileName',
+  'lineNumber',
+  'endLineNumber',
+  'message',
+  'name',
+  'number',
+  'stack'
+];

 function Exception(message, node) {
  let loc = node && node.loc,
-      line,
-      endLineNumber,
-      column,
-      endColumn;
+    line,
+    endLineNumber,
+    column,
+    endColumn;

  if (loc) {
    line = loc.start.line;
@@ -1,9 +1,9 @@
-import {appendContextPath, createFrame, isArray} from '../utils';
+import { appendContextPath, createFrame, isArray } from '../utils';

 export default function(instance) {
  instance.registerHelper('blockHelperMissing', function(context, options) {
    let inverse = options.inverse,
-        fn = options.fn;
+      fn = options.fn;

    if (context === true) {
      return fn(this);
@@ -22,8 +22,11 @@ export default function(instance) {
    } else {
      if (options.data && options.ids) {
        let data = createFrame(options.data);
-        data.contextPath = appendContextPath(options.data.contextPath, options.name);
-        options = {data: data};
+        data.contextPath = appendContextPath(
+          options.data.contextPath,
+          options.name
+        );
+        options = { data: data };
      }

      return fn(context, options);
@@ -1,4 +1,10 @@
-import {appendContextPath, blockParams, createFrame, isArray, isFunction} from '../utils';
+import {
+  appendContextPath,
+  blockParams,
+  createFrame,
+  isArray,
+  isFunction
+} from '../utils';
 import Exception from '../exception';

 export default function(instance) {
@@ -8,17 +14,20 @@ export default function(instance) {
    }

    let fn = options.fn,
-        inverse = options.inverse,
-        i = 0,
-        ret = '',
-        data,
-        contextPath;
+      inverse = options.inverse,
+      i = 0,
+      ret = '',
+      data,
+      contextPath;

    if (options.data && options.ids) {
-      contextPath = appendContextPath(options.data.contextPath, options.ids[0]) + '.';
+      contextPath =
+        appendContextPath(options.data.contextPath, options.ids[0]) + '.';
    }

-    if (isFunction(context)) { context = context.call(this); }
+    if (isFunction(context)) {
+      context = context.call(this);
+    }

    if (options.data) {
      data = createFrame(options.data);
@@ -36,10 +45,15 @@ export default function(instance) {
        }
      }

-      ret = ret + fn(context[field], {
-        data: data,
-        blockParams: blockParams([context[field], field], [contextPath + field, null])
-      });
+      ret =
+        ret +
+        fn(context[field], {
+          data: data,
+          blockParams: blockParams(
+            [context[field], field],
+            [contextPath + field, null]
+          )
+        });
    }

    if (context && typeof context === 'object') {
@@ -62,18 +76,16 @@ export default function(instance) {
      } else {
        let priorKey;

-        for (let key in context) {
-          if (context.hasOwnProperty(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 itermediate keys array.
-            if (priorKey !== undefined) {
-              execIteration(priorKey, i - 1);
-            }
-            priorKey = key;
-            i++;
+        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 itermediate keys array.
+          if (priorKey !== undefined) {
+            execIteration(priorKey, i - 1);
          }
-        }
+          priorKey = key;
+          i++;
+        });
        if (priorKey !== undefined) {
          execIteration(priorKey, i - 1, true);
        }
@@ -7,7 +7,9 @@ export default function(instance) {
      return undefined;
    } else {
      // Someone is actually trying to call something, blow up.
-      throw new Exception('Missing helper: "' + arguments[arguments.length - 1].name + '"');
+      throw new Exception(
+        'Missing helper: "' + arguments[arguments.length - 1].name + '"'
+      );
    }
  });
 }
@@ -3,8 +3,12 @@ import Exception from '../exception';

 export default function(instance) {
  instance.registerHelper('if', function(conditional, options) {
-    if (arguments.length != 2) { throw new Exception('#if requires exactly one argument');}
-    if (isFunction(conditional)) { conditional = conditional.call(this); }
+    if (arguments.length != 2) {
+      throw new Exception('#if requires exactly one argument');
+    }
+    if (isFunction(conditional)) {
+      conditional = conditional.call(this);
+    }

    // 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 condtional as purely not empty based on the
@@ -17,7 +21,13 @@ export default function(instance) {
  });

  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});
+    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
+    });
  });
 }
@@ -1,7 +1,7 @@
 export default function(instance) {
  instance.registerHelper('log', function(/* message, options */) {
    let args = [undefined],
-        options = arguments[arguments.length - 1];
+      options = arguments[arguments.length - 1];
    for (let i = 0; i < arguments.length - 1; i++) {
      args.push(arguments[i]);
    }
@@ -14,6 +14,6 @@ export default function(instance) {
    }
    args[0] = level;

-    instance.log(... args);
+    instance.log(...args);
  });
 }
@@ -1,11 +1,9 @@
 export default function(instance) {
-  instance.registerHelper('lookup', function(obj, field) {
+  instance.registerHelper('lookup', function(obj, field, options) {
    if (!obj) {
+      // Note for 5.0: Change to "obj == null" in 5.0
      return obj;
    }
-    if (field === 'constructor' && !obj.propertyIsEnumerable(field)) {
-      return undefined;
-    }
-    return obj[field];
+    return options.lookupProperty(obj, field);
  });
 }
@@ -1,10 +1,20 @@
-import { appendContextPath, blockParams, createFrame, isEmpty, isFunction } from '../utils';
+import {
+  appendContextPath,
+  blockParams,
+  createFrame,
+  isEmpty,
+  isFunction
+} from '../utils';
 import Exception from '../exception';

 export default function(instance) {
  instance.registerHelper('with', function(context, options) {
-    if (arguments.length != 2) { throw new Exception('#with requires exactly one argument');}
-    if (isFunction(context)) { context = context.call(this); }
+    if (arguments.length != 2) {
+      throw new Exception('#with requires exactly one argument');
+    }
+    if (isFunction(context)) {
+      context = context.call(this);
+    }

    let fn = options.fn;

@@ -12,7 +22,10 @@ export default function(instance) {
      let data = options.data;
      if (options.data && options.ids) {
        data = createFrame(options.data);
-        data.contextPath = appendContextPath(options.data.contextPath, options.ids[0]);
+        data.contextPath = appendContextPath(
+          options.data.contextPath,
+          options.ids[0]
+        );
      }

      return fn(context, {
@@ -0,0 +1,11 @@
+import { extend } from '../utils';
+
+/**
+ * Create a new object with "null"-prototype to avoid truthy results on prototype properties.
+ * The resulting object can be used with "object[property]" to check if a property exists
+ * @param {...object} sources a varargs parameter of source objects that will be merged
+ * @returns {object}
+ */
+export function createNewLookupObject(...sources) {
+  return extend(Object.create(null), ...sources);
+}
@@ -0,0 +1,70 @@
+import { createNewLookupObject } from './create-new-lookup-object';
+import * as logger from '../logger';
+
+const loggedProperties = Object.create(null);
+
+export function createProtoAccessControl(runtimeOptions) {
+  let defaultMethodWhiteList = Object.create(null);
+  defaultMethodWhiteList['constructor'] = false;
+  defaultMethodWhiteList['__defineGetter__'] = false;
+  defaultMethodWhiteList['__defineSetter__'] = false;
+  defaultMethodWhiteList['__lookupGetter__'] = false;
+
+  let defaultPropertyWhiteList = Object.create(null);
+  // eslint-disable-next-line no-proto
+  defaultPropertyWhiteList['__proto__'] = false;
+
+  return {
+    properties: {
+      whitelist: createNewLookupObject(
+        defaultPropertyWhiteList,
+        runtimeOptions.allowedProtoProperties
+      ),
+      defaultValue: runtimeOptions.allowProtoPropertiesByDefault
+    },
+    methods: {
+      whitelist: createNewLookupObject(
+        defaultMethodWhiteList,
+        runtimeOptions.allowedProtoMethods
+      ),
+      defaultValue: runtimeOptions.allowProtoMethodsByDefault
+    }
+  };
+}
+
+export function resultIsAllowed(result, protoAccessControl, propertyName) {
+  if (typeof result === 'function') {
+    return checkWhiteList(protoAccessControl.methods, propertyName);
+  } else {
+    return checkWhiteList(protoAccessControl.properties, propertyName);
+  }
+}
+
+function checkWhiteList(protoAccessControlForType, propertyName) {
+  if (protoAccessControlForType.whitelist[propertyName] !== undefined) {
+    return protoAccessControlForType.whitelist[propertyName] === true;
+  }
+  if (protoAccessControlForType.defaultValue !== undefined) {
+    return protoAccessControlForType.defaultValue;
+  }
+  logUnexpecedPropertyAccessOnce(propertyName);
+  return false;
+}
+
+function logUnexpecedPropertyAccessOnce(propertyName) {
+  if (loggedProperties[propertyName] !== true) {
+    loggedProperties[propertyName] = true;
+    logger.log(
+      'error',
+      `Handlebars: Access has been denied to resolve the property "${propertyName}" because it is not an "own property" of its parent.\n` +
+        `You can add a runtime option to disable the check or this warning:\n` +
+        `See https://handlebarsjs.com/api-reference/runtime-options.html#options-to-control-prototype-access for details`
+    );
+  }
+}
+
+export function resetLoggedProperties() {
+  Object.keys(loggedProperties).forEach(propertyName => {
+    delete loggedProperties[propertyName];
+  });
+}
@@ -0,0 +1,13 @@
+export function wrapHelper(helper, transformOptionsFn) {
+  if (typeof helper !== 'function') {
+    // 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 */) {
+    const options = arguments[arguments.length - 1];
+    arguments[arguments.length - 1] = transformOptionsFn(options);
+    return helper.apply(this, arguments);
+  };
+  return wrapper;
+}
@@ -1,4 +1,4 @@
-import {indexOf} from './utils';
+import { indexOf } from './utils';

 let logger = {
  methodMap: ['debug', 'info', 'warn', 'error'],
@@ -22,9 +22,13 @@ let logger = {
  log: function(level, ...message) {
    level = logger.lookupLevel(level);

-    if (typeof console !== 'undefined' && logger.lookupLevel(logger.level) <= level) {
+    if (
+      typeof console !== 'undefined' &&
+      logger.lookupLevel(logger.level) <= level
+    ) {
      let method = logger.methodMap[level];
-      if (!console[method]) { // eslint-disable-line no-console
+      // eslint-disable-next-line no-console
+      if (!console[method]) {
        method = 'log';
      }
      console[method](...message); // eslint-disable-line no-console
@@ -1,8 +1,7 @@
-/* global window */
 export default function(Handlebars) {
  /* istanbul ignore next */
  let root = typeof global !== 'undefined' ? global : window,
-      $Handlebars = root.Handlebars;
+    $Handlebars = root.Handlebars;
  /* istanbul ignore next */
  Handlebars.noConflict = function() {
    if (root.Handlebars === Handlebars) {
@@ -1,30 +1,52 @@
 import * as Utils from './utils';
 import Exception from './exception';
-import {COMPILER_REVISION, createFrame, LAST_COMPATIBLE_COMPILER_REVISION, REVISION_CHANGES} from './base';
-import {moveHelperToHooks} from './helpers';
+import {
+  COMPILER_REVISION,
+  createFrame,
+  LAST_COMPATIBLE_COMPILER_REVISION,
+  REVISION_CHANGES
+} from './base';
+import { moveHelperToHooks } from './helpers';
+import { wrapHelper } from './internal/wrapHelper';
+import {
+  createProtoAccessControl,
+  resultIsAllowed
+} from './internal/proto-access';

 export function checkRevision(compilerInfo) {
-  const compilerRevision = compilerInfo && compilerInfo[0] || 1,
-        currentRevision = COMPILER_REVISION;
+  const compilerRevision = (compilerInfo && compilerInfo[0]) || 1,
+    currentRevision = COMPILER_REVISION;

-  if (compilerRevision >= LAST_COMPATIBLE_COMPILER_REVISION && compilerRevision <= COMPILER_REVISION) {
+  if (
+    compilerRevision >= LAST_COMPATIBLE_COMPILER_REVISION &&
+    compilerRevision <= COMPILER_REVISION
+  ) {
    return;
  }

  if (compilerRevision < LAST_COMPATIBLE_COMPILER_REVISION) {
    const runtimeVersions = REVISION_CHANGES[currentRevision],
-          compilerVersions = REVISION_CHANGES[compilerRevision];
-    throw new Exception('Template was precompiled with an older version of Handlebars than the current runtime. ' +
-          'Please update your precompiler to a newer version (' + runtimeVersions + ') or downgrade your runtime to an older version (' + compilerVersions + ').');
+      compilerVersions = REVISION_CHANGES[compilerRevision];
+    throw new Exception(
+      'Template was precompiled with an older version of Handlebars than the current runtime. ' +
+        'Please update your precompiler to a newer version (' +
+        runtimeVersions +
+        ') or downgrade your runtime to an older version (' +
+        compilerVersions +
+        ').'
+    );
  } else {
    // Use the embedded version info since the runtime doesn't know about this revision yet
-    throw new Exception('Template was precompiled with a newer version of Handlebars than the current runtime. ' +
-          'Please update your runtime to a newer version (' + compilerInfo[1] + ').');
+    throw new Exception(
+      'Template was precompiled with a newer version of Handlebars than the current runtime. ' +
+        'Please update your runtime to a newer version (' +
+        compilerInfo[1] +
+        ').'
+    );
  }
 }

 export function template(templateSpec, env) {
-
  /* istanbul ignore next */
  if (!env) {
    throw new Exception('No environment passed to template');
@@ -40,7 +62,8 @@ export function template(templateSpec, env) {
  env.VM.checkRevision(templateSpec.compiler);

  // backwards compatibility for precompiled templates with compiler-version 7 (<4.3.0)
-  const templateWasPrecompiledWithCompilerV7 = templateSpec.compiler && templateSpec.compiler[0] === 7;
+  const templateWasPrecompiledWithCompilerV7 =
+    templateSpec.compiler && templateSpec.compiler[0] === 7;

  function invokePartialWrapper(partial, context, options) {
    if (options.hash) {
@@ -51,13 +74,25 @@ export function template(templateSpec, env) {
    }
    partial = env.VM.resolvePartial.call(this, partial, context, options);

-    let optionsWithHooks = Utils.extend({}, options, {hooks: this.hooks});
+    let extendedOptions = Utils.extend({}, options, {
+      hooks: this.hooks,
+      protoAccessControl: this.protoAccessControl
+    });

-    let result = env.VM.invokePartial.call(this, partial, context, optionsWithHooks);
+    let result = env.VM.invokePartial.call(
+      this,
+      partial,
+      context,
+      extendedOptions
+    );

    if (result == null && env.compile) {
-      options.partials[options.name] = env.compile(partial, templateSpec.compilerOptions, env);
-      result = options.partials[options.name](context, optionsWithHooks);
+      options.partials[options.name] = env.compile(
+        partial,
+        templateSpec.compilerOptions,
+        env
+      );
+      result = options.partials[options.name](context, extendedOptions);
    }
    if (result != null) {
      if (options.indent) {
@@ -73,7 +108,11 @@ export function template(templateSpec, env) {
      }
      return result;
    } else {
-      throw new Exception('The partial ' + options.name + ' could not be compiled when running in runtime-only mode');
+      throw new Exception(
+        'The partial ' +
+          options.name +
+          ' could not be compiled when running in runtime-only mode'
+      );
    }
  }

@@ -81,14 +120,31 @@ export function template(templateSpec, env) {
  let container = {
    strict: function(obj, name, loc) {
      if (!obj || !(name in obj)) {
-        throw new Exception('"' + name + '" not defined in ' + obj, { loc: loc });
+        throw new Exception('"' + name + '" not defined in ' + obj, {
+          loc: loc
+        });
      }
      return obj[name];
    },
+    lookupProperty: function(parent, propertyName) {
+      let result = parent[propertyName];
+      if (result == null) {
+        return result;
+      }
+      if (Object.prototype.hasOwnProperty.call(parent, propertyName)) {
+        return result;
+      }
+
+      if (resultIsAllowed(result, container.protoAccessControl, propertyName)) {
+        return result;
+      }
+      return undefined;
+    },
    lookup: function(depths, name) {
      const len = depths.length;
      for (let i = 0; i < len; i++) {
-        if (depths[i] && depths[i][name] != null) {
+        let result = depths[i] && container.lookupProperty(depths[i], name);
+        if (result != null) {
          return depths[i][name];
        }
      }
@@ -109,9 +165,17 @@ export function template(templateSpec, env) {
    programs: [],
    program: function(i, data, declaredBlockParams, blockParams, depths) {
      let programWrapper = this.programs[i],
-          fn = this.fn(i);
+        fn = this.fn(i);
      if (data || depths || blockParams || declaredBlockParams) {
-        programWrapper = wrapProgram(this, i, fn, data, declaredBlockParams, blockParams, depths);
+        programWrapper = wrapProgram(
+          this,
+          i,
+          fn,
+          data,
+          declaredBlockParams,
+          blockParams,
+          depths
+        );
      } else if (!programWrapper) {
        programWrapper = this.programs[i] = wrapProgram(this, i, fn);
      }
@@ -124,6 +188,15 @@ export function template(templateSpec, env) {
      }
      return value;
    },
+    mergeIfNeeded: function(param, common) {
+      let obj = param || common;
+
+      if (param && common && param !== common) {
+        obj = Utils.extend({}, common, param);
+      }
+
+      return obj;
+    },
    // An empty object to use as replacement for null-contexts
    nullContext: Object.seal({}),

@@ -139,47 +212,82 @@ export function template(templateSpec, env) {
      data = initData(context, data);
    }
    let depths,
-        blockParams = templateSpec.useBlockParams ? [] : undefined;
+      blockParams = templateSpec.useBlockParams ? [] : undefined;
    if (templateSpec.useDepths) {
      if (options.depths) {
-        depths = context != options.depths[0] ? [context].concat(options.depths) : options.depths;
+        depths =
+          context != options.depths[0]
+            ? [context].concat(options.depths)
+            : options.depths;
      } else {
        depths = [context];
      }
    }

-    function main(context/*, options*/) {
-      return '' + templateSpec.main(container, context, container.helpers, container.partials, data, blockParams, depths);
+    function main(context /*, options*/) {
+      return (
+        '' +
+        templateSpec.main(
+          container,
+          context,
+          container.helpers,
+          container.partials,
+          data,
+          blockParams,
+          depths
+        )
+      );
    }
-    main = executeDecorators(templateSpec.main, main, container, options.depths || [], data, blockParams);
+
+    main = executeDecorators(
+      templateSpec.main,
+      main,
+      container,
+      options.depths || [],
+      data,
+      blockParams
+    );
    return main(context, options);
  }
+
  ret.isTop = true;

  ret._setup = function(options) {
    if (!options.partial) {
-      container.helpers = Utils.extend({}, env.helpers, options.helpers);
+      let mergedHelpers = Utils.extend({}, env.helpers, options.helpers);
+      wrapHelpersToPassLookupProperty(mergedHelpers, container);
+      container.helpers = mergedHelpers;

      if (templateSpec.usePartial) {
-        container.partials = Utils.extend({}, env.partials, options.partials);
+        // Use mergeIfNeeded here to prevent compiling global partials multiple times
+        container.partials = container.mergeIfNeeded(
+          options.partials,
+          env.partials
+        );
      }
      if (templateSpec.usePartial || templateSpec.useDecorators) {
-        container.decorators = Utils.extend({}, env.decorators, options.decorators);
+        container.decorators = Utils.extend(
+          {},
+          env.decorators,
+          options.decorators
+        );
      }

      container.hooks = {};
+      container.protoAccessControl = createProtoAccessControl(options);

-      let keepHelperInHelpers = options.allowCallsToHelperMissing || templateWasPrecompiledWithCompilerV7;
+      let keepHelperInHelpers =
+        options.allowCallsToHelperMissing ||
+        templateWasPrecompiledWithCompilerV7;
      moveHelperToHooks(container, 'helperMissing', keepHelperInHelpers);
      moveHelperToHooks(container, 'blockHelperMissing', keepHelperInHelpers);
-
    } else {
+      container.protoAccessControl = options.protoAccessControl; // internal option
      container.helpers = options.helpers;
      container.partials = options.partials;
      container.decorators = options.decorators;
      container.hooks = options.hooks;
    }
-
  };

  ret._child = function(i, data, blockParams, depths) {
@@ -190,24 +298,47 @@ export function template(templateSpec, env) {
      throw new Exception('must pass parent depths');
    }

-    return wrapProgram(container, i, templateSpec[i], data, 0, blockParams, depths);
+    return wrapProgram(
+      container,
+      i,
+      templateSpec[i],
+      data,
+      0,
+      blockParams,
+      depths
+    );
  };
  return ret;
 }

-export function wrapProgram(container, i, fn, data, declaredBlockParams, blockParams, depths) {
+export function wrapProgram(
+  container,
+  i,
+  fn,
+  data,
+  declaredBlockParams,
+  blockParams,
+  depths
+) {
  function prog(context, options = {}) {
    let currentDepths = depths;
-    if (depths && context != depths[0] && !(context === container.nullContext && depths[0] === null)) {
+    if (
+      depths &&
+      context != depths[0] &&
+      !(context === container.nullContext && depths[0] === null)
+    ) {
      currentDepths = [context].concat(depths);
    }

-    return fn(container,
-        context,
-        container.helpers, container.partials,
-        options.data || data,
-        blockParams && [options.blockParams].concat(blockParams),
-        currentDepths);
+    return fn(
+      container,
+      context,
+      container.helpers,
+      container.partials,
+      options.data || data,
+      blockParams && [options.blockParams].concat(blockParams),
+      currentDepths
+    );
  }

  prog = executeDecorators(fn, prog, container, depths, data, blockParams);
@@ -249,8 +380,10 @@ export function invokePartial(partial, context, options) {
    options.data = createFrame(options.data);
    // Wrapper function to get access to currentPartialBlock from the closure
    let fn = options.fn;
-    partialBlock = options.data['partial-block'] = function partialBlockWrapper(context, options = {}) {
-
+    partialBlock = options.data['partial-block'] = function partialBlockWrapper(
+      context,
+      options = {}
+    ) {
      // Restore the partial-block from the closure for the execution of the block
      // i.e. the part inside the block of the partial call.
      options.data = createFrame(options.data);
@@ -273,7 +406,9 @@ export function invokePartial(partial, context, options) {
  }
 }

-export function noop() { return ''; }
+export function noop() {
+  return '';
+}

 function initData(context, data) {
  if (!data || !('root' in data)) {
@@ -286,8 +421,30 @@ function initData(context, data) {
 function executeDecorators(fn, prog, container, depths, data, blockParams) {
  if (fn.decorator) {
    let props = {};
-    prog = fn.decorator(prog, props, container, depths && depths[0], data, blockParams, depths);
+    prog = fn.decorator(
+      prog,
+      props,
+      container,
+      depths && depths[0],
+      data,
+      blockParams,
+      depths
+    );
    Utils.extend(prog, props);
  }
  return prog;
 }
+
+function wrapHelpersToPassLookupProperty(mergedHelpers, container) {
+  Object.keys(mergedHelpers).forEach(helperName => {
+    let helper = mergedHelpers[helperName];
+    mergedHelpers[helperName] = passLookupPropertyOption(helper, container);
+  });
+}
+
+function passLookupPropertyOption(helper, container) {
+  const lookupProperty = container.lookupProperty;
+  return wrapHelper(helper, options => {
+    return Utils.extend({ lookupProperty }, options);
+  });
+}
@@ -1,4 +1,3 @@
-
 const escape = {
  '&': '&amp;',
  '<': '&lt;',
@@ -10,13 +9,13 @@ const escape = {
 };

 const badChars = /[&<>"'`=]/g,
-      possible = /[&<>"'`=]/;
+  possible = /[&<>"'`=]/;

 function escapeChar(chr) {
  return escape[chr];
 }

-export function extend(obj/* , ...source */) {
+export function extend(obj /* , ...source */) {
  for (let i = 1; i < arguments.length; i++) {
    for (let key in arguments[i]) {
      if (Object.prototype.hasOwnProperty.call(arguments[i], key)) {
@@ -40,16 +39,23 @@ let isFunction = function(value) {
 /* istanbul ignore next */
 if (isFunction(/x/)) {
  isFunction = function(value) {
-    return typeof value === 'function' && toString.call(value) === '[object Function]';
+    return (
+      typeof value === 'function' &&
+      toString.call(value) === '[object Function]'
+    );
  };
 }
-export {isFunction};
+export { isFunction };
 /* eslint-enable func-style */

 /* istanbul ignore next */
-export const isArray = Array.isArray || function(value) {
-  return (value && typeof value === 'object') ? toString.call(value) === '[object Array]' : false;
-};
+export const isArray =
+  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) {
@@ -61,7 +67,6 @@ export function indexOf(array, value) {
  return -1;
 }

-
 export function escapeExpression(string) {
  if (typeof string !== 'string') {
    // don't escape SafeStrings, since they're already safe
@@ -79,7 +84,9 @@ export function escapeExpression(string) {
    string = '' + string;
  }

-  if (!possible.test(string)) { return string; }
+  if (!possible.test(string)) {
+    return string;
+  }
  return string.replace(badChars, escapeChar);
 }

@@ -2,9 +2,8 @@
 import Async from 'neo-async';
 import fs from 'fs';
 import * as Handlebars from './handlebars';
-import {basename} from 'path';
-import {SourceMapConsumer, SourceNode} from 'source-map';
-
+import { basename } from 'path';
+import { SourceMapConsumer, SourceNode } from 'source-map';

 module.exports.loadTemplates = function(opts, callback) {
  loadStrings(opts, function(err, strings) {
@@ -25,14 +24,19 @@ module.exports.loadTemplates = function(opts, callback) {

 function loadStrings(opts, callback) {
  let strings = arrayCast(opts.string),
-      names = arrayCast(opts.name);
+    names = arrayCast(opts.name);

-  if (names.length !== strings.length
-      && strings.length > 1) {
-    return callback(new Handlebars.Exception('Number of names did not match the number of string inputs'));
+  if (names.length !== strings.length && strings.length > 1) {
+    return callback(
+      new Handlebars.Exception(
+        'Number of names did not match the number of string inputs'
+      )
+    );
  }

-  Async.map(strings, function(string, callback) {
+  Async.map(
+    strings,
+    function(string, callback) {
      if (string !== '-') {
        callback(undefined, string);
      } else {
@@ -55,80 +59,94 @@ function loadStrings(opts, callback) {
        source: string
      }));
      callback(err, strings);
-    });
+    }
+  );
 }

 function loadFiles(opts, callback) {
  // Build file extension pattern
-  let extension = (opts.extension || 'handlebars').replace(/[\\^$*+?.():=!|{}\-[\]]/g, function(arg) { return '\\' + arg; });
+  let extension = (opts.extension || 'handlebars').replace(
+    /[\\^$*+?.():=!|{}\-[\]]/g,
+    function(arg) {
+      return '\\' + arg;
+    }
+  );
  extension = new RegExp('\\.' + extension + '$');

  let ret = [],
-      queue = (opts.files || []).map((template) => ({template, root: opts.root}));
-  Async.whilst(() => queue.length, function(callback) {
-    let {template: path, root} = queue.shift();
+    queue = (opts.files || []).map(template => ({ template, root: opts.root }));
+  Async.whilst(
+    () => queue.length,
+    function(callback) {
+      let { template: path, root } = queue.shift();

-    fs.stat(path, function(err, stat) {
-      if (err) {
-        return callback(new Handlebars.Exception(`Unable to open template file "${path}"`));
-      }
+      fs.stat(path, function(err, stat) {
+        if (err) {
+          return callback(
+            new Handlebars.Exception(`Unable to open template file "${path}"`)
+          );
+        }

-      if (stat.isDirectory()) {
-        opts.hasDirectory = true;
+        if (stat.isDirectory()) {
+          opts.hasDirectory = true;

-        fs.readdir(path, function(err, children) {
-          /* istanbul ignore next : Race condition that being too lazy to test */
-          if (err) {
-            return callback(err);
-          }
-          children.forEach(function(file) {
-            let childPath = path + '/' + file;
-
-            if (extension.test(childPath) || fs.statSync(childPath).isDirectory()) {
-              queue.push({template: childPath, root: root || path});
+          fs.readdir(path, function(err, children) {
+            /* istanbul ignore next : Race condition that being too lazy to test */
+            if (err) {
+              return callback(err);
            }
-          });
+            children.forEach(function(file) {
+              let childPath = path + '/' + file;

-          callback();
-        });
+              if (
+                extension.test(childPath) ||
+                fs.statSync(childPath).isDirectory()
+              ) {
+                queue.push({ template: childPath, root: root || path });
+              }
+            });
+
+            callback();
+          });
+        } else {
+          fs.readFile(path, 'utf8', function(err, data) {
+            /* istanbul ignore next : Race condition that being too lazy to test */
+            if (err) {
+              return callback(err);
+            }
+
+            if (opts.bom && data.indexOf('\uFEFF') === 0) {
+              data = data.substring(1);
+            }
+
+            // Clean the template name
+            let name = path;
+            if (!root) {
+              name = basename(name);
+            } else if (name.indexOf(root) === 0) {
+              name = name.substring(root.length + 1);
+            }
+            name = name.replace(extension, '');
+
+            ret.push({
+              path: path,
+              name: name,
+              source: data
+            });
+
+            callback();
+          });
+        }
+      });
+    },
+    function(err) {
+      if (err) {
+        callback(err);
      } else {
-        fs.readFile(path, 'utf8', function(err, data) {
-          /* istanbul ignore next : Race condition that being too lazy to test */
-          if (err) {
-            return callback(err);
-          }
-
-          if (opts.bom && data.indexOf('\uFEFF') === 0) {
-            data = data.substring(1);
-          }
-
-          // Clean the template name
-          let name = path;
-          if (!root) {
-            name = basename(name);
-          } else if (name.indexOf(root) === 0) {
-            name = name.substring(root.length + 1);
-          }
-          name = name.replace(extension, '');
-
-          ret.push({
-            path: path,
-            name: name,
-            source: data
-          });
-
-          callback();
-        });
+        callback(undefined, ret);
      }
-    });
-  },
-  function(err) {
-    if (err) {
-      callback(err);
-    } else {
-      callback(undefined, ret);
    }
-  });
+  );
 }

 module.exports.cli = function(opts) {
@@ -138,7 +156,9 @@ module.exports.cli = function(opts) {
  }

  if (!opts.templates.length && !opts.hasDirectory) {
-    throw new Handlebars.Exception('Must define at least one template or directory.');
+    throw new Handlebars.Exception(
+      'Must define at least one template or directory.'
+    );
  }

  if (opts.simple && opts.min) {
@@ -147,12 +167,18 @@ module.exports.cli = function(opts) {

  const multiple = opts.templates.length !== 1 || opts.hasDirectory;
  if (opts.simple && multiple) {
-    throw new Handlebars.Exception('Unable to output multiple templates in simple mode');
+    throw new Handlebars.Exception(
+      'Unable to output multiple templates in simple mode'
+    );
  }

  // Force simple mode if we have only one template and it's unnamed.
-  if (!opts.amd && !opts.commonjs && opts.templates.length === 1
-      && !opts.templates[0].name) {
+  if (
+    !opts.amd &&
+    !opts.commonjs &&
+    opts.templates.length === 1 &&
+    !opts.templates[0].name
+  ) {
    opts.simple = true;
  }

@@ -172,7 +198,11 @@ module.exports.cli = function(opts) {
  let output = new SourceNode();
  if (!opts.simple) {
    if (opts.amd) {
-      output.add('define([\'' + opts.handlebarPath + 'handlebars.runtime\'], function(Handlebars) {\n  Handlebars = Handlebars["default"];');
+      output.add(
+        "define(['" +
+          opts.handlebarPath +
+          'handlebars.runtime\'], function(Handlebars) {\n  Handlebars = Handlebars["default"];'
+      );
    } else if (opts.commonjs) {
      output.add('var Handlebars = require("' + opts.commonjs + '");');
    } else {
@@ -206,7 +236,10 @@ module.exports.cli = function(opts) {
    // If we are generating a source map, we have to reconstruct the SourceNode object
    if (opts.map) {
      let consumer = new SourceMapConsumer(precompiled.map);
-      precompiled = SourceNode.fromStringWithSourceMap(precompiled.code, consumer);
+      precompiled = SourceNode.fromStringWithSourceMap(
+        precompiled.code,
+        consumer
+      );
    }

    if (opts.simple) {
@@ -219,7 +252,14 @@ module.exports.cli = function(opts) {
      if (opts.amd && !multiple) {
        output.add('return ');
      }
-      output.add([objectName, '[\'', template.name, '\'] = template(', precompiled, ');\n']);
+      output.add([
+        objectName,
+        "['",
+        template.name,
+        "'] = template(",
+        precompiled,
+        ');\n'
+      ]);
    }
  });

@@ -286,7 +326,9 @@ function minify(output, sourceMapFile) {
      throw e;
    }
    // it does not exist!
-    console.error('Code minimization is disabled due to missing uglify-js dependency');
+    console.error(
+      'Code minimization is disabled due to missing uglify-js dependency'
+    );
    return output;
  }
  return require('uglify-js').minify(output.code, {
@@ -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'
+};
@@ -1,7 +1,7 @@
 {
  "name": "handlebars",
  "barename": "handlebars",
-  "version": "4.5.1",
+  "version": "4.7.6",
  "description": "Handlebars provides the power necessary to let you build semantic templates effectively with no frustration",
  "homepage": "http://www.handlebarsjs.com/",
  "keywords": [
@@ -21,9 +21,10 @@
    "node": ">=0.4.7"
  },
  "dependencies": {
+    "minimist": "^1.2.5",
    "neo-async": "^2.6.0",
-    "optimist": "^0.6.1",
-    "source-map": "^0.6.1"
+    "source-map": "^0.6.1",
+    "wordwrap": "^1.0.0"
  },
  "optionalDependencies": {
    "uglify-js": "^3.1.4"
@@ -34,12 +35,19 @@
    "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",
    "dtslint": "^0.5.5",
    "dustjs-linkedin": "^2.0.2",
    "eco": "~1.1.0-rc-3",
+    "eslint": "^6.7.2",
+    "eslint-config-prettier": "^6.7.0",
    "eslint-plugin-compat": "^3.3.0",
    "eslint-plugin-es5": "^1.4.1",
-    "grunt": "^1.0.3",
+    "fs-extra": "^8.1.0",
+    "grunt": "^1.0.4",
    "grunt-babel": "^5.0.0",
    "grunt-bg-shell": "^2.3.3",
    "grunt-cli": "^1",
@@ -50,14 +58,23 @@
    "grunt-contrib-requirejs": "^1",
    "grunt-contrib-uglify": "^1",
    "grunt-contrib-watch": "^1.1.0",
-    "grunt-eslint": "^20.1.0",
+    "grunt-karma": "^4.0.0",
    "grunt-webpack": "^1.0.8",
-    "istanbul": "^0.3.0",
+    "husky": "^3.1.0",
    "jison": "~0.3.0",
+    "karma": "^5.0.5",
+    "karma-chrome-launcher": "^3.1.0",
+    "karma-mocha": "^2.0.1",
+    "karma-requirejs": "^1.1.0",
+    "karma-sauce-launcher": "^4.1.4",
+    "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",
@@ -73,8 +90,15 @@
    "handlebars": "bin/handlebars"
  },
  "scripts": {
-    "checkTypes": "dtslint types",
-    "test": "grunt"
+    "format": "prettier --write '**/*.js' && eslint --fix .",
+    "check-format": "prettier --check '**/*.js'",
+    "lint": "eslint --max-warnings 0 .",
+    "dtslint": "dtslint types",
+    "test": "grunt",
+    "extensive-tests-and-publish-to-aws": "npx mocha tasks/task-tests/ && grunt --stack extensive-tests-and-publish-to-aws",
+    "integration-test": "grunt integration-tests",
+    "--- combined tasks ---": "",
+    "check-before-pull-request": "concurrently --kill-others-on-fail npm:lint npm:dtslint npm:check-format npm:test"
  },
  "jspm": {
    "main": "handlebars",
@@ -94,6 +118,22 @@
    "print-script",
    "release-notes.md",
    "runtime.js",
-    "types/*.d.ts"
-  ]
+    "types/*.d.ts",
+    "runtime.d.ts"
+  ],
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.{js,css,json,md}": [
+      "prettier --write",
+      "git add"
+    ],
+    "*.js": [
+      "eslint --fix",
+      "git add"
+    ]
+  }
 }
@@ -0,0 +1,5 @@
+module.exports = {
+  tabWidth: 2,
+  semi: true,
+  singleQuote: true
+};
@@ -2,120 +2,321 @@

 ## Development

-[Commits](https://github.com/wycats/handlebars.js/compare/v4.5.1...master)
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.7.6...master)
+
+## v4.7.6 - April 3rd, 2020
+
+Chore/Housekeeping:
+
+- [#1672](https://github.com/wycats/handlebars.js/issues/1672) - Switch cmd parser to latest minimist ([@dougwilson](https://api.github.com/users/dougwilson)
+
+Compatibility notes:
+
+- Restored Node.js compatibility
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.7.5...v4.7.6)
+
+## v4.7.5 - April 2nd, 2020
+
+Chore/Housekeeping:
+
+- ~Node.js version support has been changed to v6+~ Reverted in 4.7.6
+
+Compatibility notes:
+
+- ~Node.js < v6 is no longer supported~ Reverted in 4.7.6
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.7.4...v4.7.5)
+
+## v4.7.4 - April 1st, 2020
+
+Chore/Housekeeping:
+
+- [#1666](https://github.com/wycats/handlebars.js/issues/1666) - Replaced minimist with yargs for handlebars CLI ([@aorinevo](https://api.github.com/users/aorinevo), [@AviVahl](https://api.github.com/users/AviVahl) & [@fabb](https://api.github.com/users/fabb))
+
+Compatibility notes:
+
+- No incompatibilities are to be expected
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.7.3...v4.7.4)
+
+## v4.7.3 - February 5th, 2020
+
+Chore/Housekeeping:
+
+- [#1644](https://github.com/wycats/handlebars.js/issues/1644) - Download links to aws broken on handlebarsjs.com - access denied ([@Tea56](https://api.github.com/users/Tea56))
+- Fix spelling and punctuation in changelog - d78cc73
+
+Bugfixes:
+
+- Add Type Definition for Handlebars.VERSION, Fixes #1647 - 4de51fe
+- Include Type Definition for runtime.js in Package - a32d05f
+
+Compatibility notes:
+
+- No incompatibilities are to be expected
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.7.2...v4.7.3)
+
+## v4.7.2 - January 13th, 2020
+
+Bugfixes:
+
+- fix: don't wrap helpers that are not functions - 9d5aa36, #1639
+
+Chore/Build:
+
+- chore: execute saucelabs-task only if access-key exists - a4fd391
+
+Compatibility notes:
+
+- No breaking changes are to be expected
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.7.1...v4.7.2)
+
+## v4.7.1 - January 12th, 2020
+
+Bugfixes:
+
+- fix: fix log output in case of illegal property access - f152dfc
+- fix: log error for illegal property access only once per property - 3c1e252
+
+Compatibility notes:
+
+- no incompatibilities are to be expected.
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.7.0...v4.7.1)
+
+## v4.7.0 - January 10th, 2020
+
+Features:
+
+- feat: default options for controlling proto access - 7af1c12, #1635
+  - This makes it possible to disable the prototype access restrictions added in 4.6.0
+  - an error is logged in the console, if access to prototype properties is attempted and denied
+    and no explicit configuration has taken place.
+
+Compatibility notes:
+
+- no compatibilities are expected
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.6.0...v4.7.0)
+
+## v4.6.0 - January 8th, 2020
+
+Features:
+
+- feat: access control to prototype properties via whitelist (#1633)- d03b6ec
+
+Bugfixes:
+
+- fix(runtime.js): partials compile not caching (#1600) - 23d58e7
+
+Chores, docs:
+
+- various refactorings and improvements to tests - d7f0dcf, 187d611, d337f40
+- modernize the build-setup
+  - use prettier to format and eslint to verify - c40d9f3, 8901c28, e97685e, 1f61f21
+  - use nyc instead of istanbul to collect coverage - 164b7ff, 1ebce2b
+  - update build code to use modern javascript and make it cleaner - 14b621c, 1ec1737, 3a5b65e, dde108e, 04b1984, 587e7a3
+  - restructur build commands - e913dc5,
+- eslint rule changes - ac4655e, dc54952
+- Update (C) year in the LICENSE file - d1fb07b
+- chore: try to fix saucelabs credentials (#1627) -
+- Update readme.md with updated links (#1620) - edcc84f
+
+BREAKING CHANGES:
+
+- access to prototype properties is forbidden completely by default,
+  specific properties or methods can be allowed via runtime-options.
+  See #1633 for details.
+  If you are using Handlebars as documented, you should not be accessing prototype
+  properties from your template anyway, so the changes should not be a problem
+  for you. Only the use of undocumented features can break your build.
+
+  That is why we only bump the minor version despite mentioning breaking changes.
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.5.3...v4.6.0)
+
+## v4.5.3 - November 18th, 2019
+
+Bugfixes:
+
+- fix: add "no-prototype-builtins" eslint-rule and fix all occurences - f7f05d7
+- fix: add more properties required to be enumerable - 1988878
+
+Chores / Build:
+
+- fix: use !== 0 instead of != 0 - c02b05f
+- add chai and dirty-chai and sinon, for cleaner test-assertions and spies,
+  deprecate old assertion-methods - 93e284e, 886ba86, 0817dad, 93516a0
+
+Security:
+
+- The properties `__proto__`, `__defineGetter__`, `__defineSetter__` and `__lookupGetter__`
+  have been added to the list of "properties that must be enumerable".
+  If a property by that name is found and not enumerable on its parent,
+  it will silently evaluate to `undefined`. This is done in both the compiled template and the "lookup"-helper.
+  This will prevent new Remote-Code-Execution exploits that have been
+  published recently.
+
+Compatibility notes:
+
+- Due to the security-fixes. The semantics of the templates using
+  `__proto__`, `__defineGetter__`, `__defineSetter__` and `__lookupGetter__` in the respect that those expression now return
+  `undefined` rather than their actual value from the proto.
+- The semantics have not changed in cases where the properties are enumerable, as in:
+
+```js
+{
+  __proto__: 'some string';
+}
+```
+
+- The change may be breaking in that respect, but we still only
+  increase the patch-version, because the incompatible use-cases
+  are not intended, undocumented and far less important than fixing
+  Remote-Code-Execution exploits on existing systems.
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.5.2...v4.5.3)
+
+## v4.5.2 - November 13th, 2019
+
+# Bugfixes
+
+- fix: use String(field) in lookup when checking for "constructor" - d541378
+- test: add fluent API for testing Handlebars - c2ac79c
+
+Compatibility notes:
+
+- no incompatibility are to be expected
+
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.5.1...v4.5.2)

 ## v4.5.1 - October 29th, 2019
+
 Bugfixs

 - fix: move "eslint-plugin-compat" to devDependencies - 5e9d17f (#1589)

 Compatibility notes:
- No compatibility issues are to be expected

+- No compatibility issues are to be expected

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.5.0...v4.5.1)

 ## v4.5.0 - October 28th, 2019
+
 Features / Improvements
+
 - Add method Handlebars.parseWithoutProcessing (#1584) - 62ed3c2
 - add guard to if & unless helpers (#1549)
 - show source location for the strict lookup exceptions - feb60f8

 Bugfixes:
+
 - Use objects for hash value tracking - 7fcf9d2

 Chore:
+
 - Resolve deprecation warning message from eslint while running eslint (#1586) - 7052e88
 - chore: add eslint-plugin-compat and eslint-plugin-es5 - 088e618

 Compatibility notes:
+
 - No compatibility issues are to be expected

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.4.5...v4.5.0)

 ## v4.4.5 - October 20th, 2019
-Bugfixes: 
+
+Bugfixes:

 - Contents of raw-blocks must be matched with non-eager regex-matching - 8d5530e, #1579

-
-
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.4.4...v4.4.5)

 ## v4.4.4 - October 20th, 2019
+
 Bugfixes:
+
 - fix: prevent zero length tokens in raw-blocks (#1577, #1578) - f1752fe

-Chore: 
+Chore:
+
 - chore: link to s3 bucket with https, add "npm ci" to build instructions - 0b593bf

 Compatibility notes:
+
 - no compatibility issues are expected

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.4.3...v4.4.4)

 ## v4.4.3 - October 8th, 2019
+
 Bugfixes

 Typings:
+
 - add missing type fields to AST typings and add tests for them - 0440af2

-
-
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.4.2...v4.4.3)

 ## v4.4.2 - October 2nd, 2019
- chore: fix grunt-saucelabs dependency - b7eada0

+- chore: fix grunt-saucelabs dependency - b7eada0

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.4.1...v4.4.2)

 ## v4.4.1 - October 2nd, 2019
+
 - [#1562](https://github.com/wycats/handlebars.js/issues/1562) - Error message for syntax error missing location in 4.2.1+

-
-
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.4.0...v4.4.1)

 ## v4.4.0 - September 29th, 2019
- Added support for iterable objects in {{#each}} helper (#1557) - cf7545e

+- Added support for iterable objects in {{#each}} helper (#1557) - cf7545e

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.3.4...v4.4.0)

 ## v4.3.4 - September 28th, 2019
+
 - fix: harden "propertyIsEnumerable"-check - ff4d827

 Compatibility notes:
+
 - No incompatibilities are known.

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.3.3...v4.3.4)

 ## v4.3.3 - September 27th, 2019
- - fix test case for browsers that do not support __defineGetter__ - 8742bde

+- fix test case for browsers that do not support **defineGetter** - 8742bde

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.3.2...v4.3.3)

 ## v4.3.2 - September 26th, 2019
+
 - Use Object.prototype.propertyIsEnumerable to check for constructors - 213c0bb, #1563

 Compatibility notes:
+
 - There are no breaking changes

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.3.1...v4.3.2)

 ## v4.3.1 - September 25th, 2019
+
 Fixes:

 - do not break on precompiled templates from Handlebars >=4.0.0 <4.3.0 - 1266838, #1561
 - Ensure allowCallsToHelperMissing runtime option is optional in typings - 93444c5, 64ecb9e, #1560

-
-
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.3.0...v4.3.1)

 ## v4.3.0 - September 24th, 2019
+
 Fixes:

 - Security: Disallow calling "helperMissing" and "blockHelperMissing" directly - 2078c72
@@ -128,18 +329,20 @@ Features:
 Breaking changes:

 Compatibility notes:
+
 - Compiler revision increased - 06b7224
+
  - This means that template compiled with versions prior to 4.3.0 will not work with runtimes >= 4.3.0
    The increase was done because the "helperMissing" and "blockHelperMissing" are now moved from the helpers
    to the internal "container.hooks" object, so old templates will not be able to call them anymore. We suggest
    that you always recompile your templates with the latest compiler in your build pipelines.

 - Disallow calling "helperMissing" and "blockHelperMissing" directly - 2078c72
-  - Calling "helperMissing" and "blockHelperMissing" directly from a template (like in `{{blockHelperMissing}}` was 
-    never intended and was part of the exploits that have been revealed early in 2019 
-    (see https://github.com/wycats/handlebars.js/issues/1495). *It is also part of a new exploit that 
-    is not captured by the earlier fix.* In order to harden Handlebars against such exploits, calling thos helpers 
-    is now not possible anymore. *Overriding* those helpers is still possible.
+  - Calling "helperMissing" and "blockHelperMissing" directly from a template (like in `{{blockHelperMissing}}` was
+    never intended and was part of the exploits that have been revealed early in 2019
+    (see https://github.com/wycats/handlebars.js/issues/1495). _It is also part of a new exploit that
+    is not captured by the earlier fix._ In order to harden Handlebars against such exploits, calling thos helpers
+    is now not possible anymore. _Overriding_ those helpers is still possible.
  - If you really need this behavior, you can set the runtime option `allowCallsToHelperMissing` to `true` and the
    calls will again be possible

@@ -147,86 +350,97 @@ Both bullet points imly that Handlebars is not 100% percent compatible to 4.2.0,

 We consider it more important to resolve a major security issue than to maintain 100% compatibility.

-    
-
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.2.1...v4.3.0)

 ## v4.2.1 - September 20th, 2019
-Bugfixes: 
+
+Bugfixes:

 - The "browser" property in the package.json has been updated to use the common-js builds instead of the minified UMD - c55a7be, #1553

 Compatibility notes:
+
 - No compatibility issues should arise

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.2.0...v4.2.1)

 ## v4.2.0 - September 3rd, 2019
+
 Chore/Test:
+
 - Use custom `grunt-saucelab` with current sauce-connect proxy - f119497
 - Add framework for various integration tests - f9cce4d
 - Add integration test for webpack - a57b682

-
 Bugfixes:
+
 - [#1544](https://github.com/wycats/handlebars.js/issues/1544) - Typescript types: `knownHelpers` doesnt allow for custom helpers ([@NickCis](https://api.github.com/users/NickCis))
 - [#1534](https://github.com/wycats/handlebars.js/pull/1534) - Add typings for "Handlebars.VM.resolvePartial ([@AndrewLeedham](https://api.github.com/users/AndrewLeedham))

 Features:
+
 - [#1540](https://github.com/wycats/handlebars.js/pull/1540) - added "browser"-property to package.json, resolves #1102 ([@ouijan](https://api.github.com/users/ouijan))

 Compatibility notes:
- The new "browser"-property should not break anything, but you can never be sure. The integration test for webpack 
+
+- The new "browser"-property should not break anything, but you can never be sure. The integration test for webpack
  shows that it works, but if it doesn't please open an issue.

-
-
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.1.2-0...v4.2.0)

 ## v4.1.2-0 - August 25th, 2019
+
 [#1540](https://github.com/wycats/handlebars.js/pull/1540) - added browser to package.json, resolves #1102 ([@ouijan](https://api.github.com/users/ouijan))

 Compatibility notes:
+
 - We are not sure if imports via webpack are still working, which is why this release is a pre-release

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.1.2...v4.1.2-0)

 ## v4.1.2 - April 13th, 2019
+
 Chore/Test:
+
 - [#1515](https://github.com/wycats/handlebars.js/pull/1515) - Port over linting and test for typings ([@zimmi88](https://api.github.com/users/zimmi88))
 - chore: add missing typescript dependency, add package-lock.json - 594f1e3
 - test: remove safari from saucelabs - 871accc

-Bugfixes: 
+Bugfixes:
+
 - fix: prevent RCE through the "lookup"-helper - cd38583

 Compatibility notes:

-Access to the constructor of a class thought `{{lookup obj "constructor" }}` is now prohibited. This closes 
+Access to the constructor of a class thought `{{lookup obj "constructor" }}` is now prohibited. This closes
 a leak that only half closed in versions 4.0.13 and 4.1.0, but it is a slight incompatibility.

 This kind of access is not the intended use of Handlebars and leads to the vulnerability described
-in #1495. We will **not** increase the major version, because such use is not intended or documented, 
+in #1495. We will **not** increase the major version, because such use is not intended or documented,
 and because of the potential impact of the issue (we fear that most people won't use a new major version
-and the issue may not be resolved on many systems). 
+and the issue may not be resolved on many systems).

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.1.1...v4.1.2)

 ## v4.1.1 - March 16th, 2019
+
 Bugfixes:
+
 - fix: add "runtime.d.ts" to allow "require('handlebars/runtime')" in TypeScript - 5cedd62

 Refactorings:
+
 - replace "async" with "neo-async" - 048f2ce
 - use "substring"-function instead of "substr" - 445ae12

 Compatibility notes:
- This is a bugfix release. There are no breaking change and no new features.

+- This is a bugfix release. There are no breaking change and no new features.

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.1.0...v4.1.1)

 ## v4.1.0 - February 7th, 2019
+
 New Features

 - import TypeScript typings - 27ac1ee
@@ -259,11 +473,10 @@ document.getElementById('output').innerHTML = template(new SomeClass());

 This kind of access is not the intended use of Handlebars and leads to the vulnerability described in #1495. We will **not** increase the major version, because such use is not intended or documented, and because of the potential impact of the issue (we fear that most people won't use a new major version and the issue may not be resolved on many systems).

-
-
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.12...v4.1.0)

 ## v4.0.12 - September 4th, 2018
+
 New features:

 - none
@@ -288,25 +501,27 @@ Removed obsolete code:
 - Update jsfiddle to 4.0.11 - 8947dd0

 Compatibility notes:
+
 - No compatibility issues are to be expected

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.11...v4.0.12)

 ## v4.0.11 - October 17th, 2017
+
 - [#1391](https://github.com/wycats/handlebars.js/issues/1391) - `uglify-js` is unconditionally imported, but only listed as optional dependency ([@Turbo87](https://github.com/Turbo87))
 - [#1233](https://github.com/wycats/handlebars.js/issues/1233) - Unable to build under windows - error at test:bin task ([@blikblum](https://github.com/blikblum))
 - Update (C) year in the LICENSE file - 21386b6

 Compatibility notes:
+
 - This is a bugfix release. There are no breaking change and no new features.

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.10...v4.0.11)

 ## v4.0.10 - May 21st, 2017
+
 - Fix regression in 4.0.9: Replace "Object.assign" (not support in IE) by "util/extend" - 0e953d1

-
-
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.9...v4.0.10)

 ## v4.0.9 - May 21st, 2017
@@ -314,39 +529,44 @@ Compatibility notes:
 - [#1327](https://github.com/wycats/handlebars.js/issues/1327) Handlebars.compile() does not modify "options" anymore
 - pending [#1331](https://github.com/wycats/handlebars.js/issues/1331) Attempts to build Handlebars in a Windows environment
  - Fix build in windows - cc554a5
-  - Ensure LF line-edings in handlebars-template fixtures (*.hbs) - ed879a6
+  - Ensure LF line-edings in handlebars-template fixtures (\*.hbs) - ed879a6
  - Run integration test with `node handlebars -a ...` on Windows - 2e21e2b
-  - Ensure LF line-edings in lexer-files (*.l) - bdfdbea
+  - Ensure LF line-edings in lexer-files (\*.l) - bdfdbea
  - Force LF line-endings for spec/artifacts - b50ef03
  - Use istanbul/lib/cli.js instead of node_modules/.bin/istanbul - 6e6269f
 - TravisCI: Publish valid semver tags independently of the branch - 7378f85

 Compatibility notes:
+
 - No compatibility issues are expected.

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.8...v4.0.9)

 ## v4.0.8 - May 2nd, 2017
+
 - [#1341](https://github.com/wycats/handlebars.js/issues/1341) [#1342](https://github.com/wycats/handlebars.js/issues/1342) Allow partial-blocks to be executed without "options" ([@nknapp](https://github.com/nknapp)) - a00c598

 Compatibility notes:
+
 - No breaking changes

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.7...v4.0.8)

 ## v4.0.7 - April 29th, 2017
+
 - [#1319](https://github.com/wycats/handlebars.js/issues/1319): Fix context-stack when calling block-helpers on null values ([@nknapp](https://github.com/nknapp)) - c8f4b57
 - [#1315](https://github.com/wycats/handlebars.js/pull/1315) Parser: Change suffix to use ES6 default module export ([@Turbo87](https://github.com/Turbo87))- b617375
- [#1290](https://github.com/wycats/handlebars.js/pull/1290) [#1252](https://github.com/wycats/handlebars.js/issue/1290) Add more tests for partial-blocks and inline partials ([@nknapp](https://github.com/nknapp)) -  63a8e0c
+- [#1290](https://github.com/wycats/handlebars.js/pull/1290) [#1252](https://github.com/wycats/handlebars.js/issue/1290) Add more tests for partial-blocks and inline partials ([@nknapp](https://github.com/nknapp)) - 63a8e0c
 - [#1252](https://github.com/wycats/handlebars.js/issue/1290) Using @partial-block twice in a template not possible ([@nknapp](https://github.com/nknapp)) - 5a164d0
 - [#1310](https://github.com/wycats/handlebars.js/pull/1310) Avoid duplicate "sourceMappingURL=" lines. ([@joonas-lahtinen](https://github.com/joonas-lahtinen)) - 01b0f65
 - [#1275](https://github.com/wycats/handlebars.js/pull/1275) require('sys') is deprecated, using 'util' instead ([@travnels](https://github.com/travnels)) - 406f2ee
 - [#1285](https://github.com/wycats/handlebars.js/pull/1285) [#1284](https://github.com/wycats/handlebars.js/issues/1284) Make "column"-property of Errors enumerable ([@nknapp](https://github.com/nknapp)) - a023cb4
 - [#1285](https://github.com/wycats/handlebars.js/pull/1285) Testcase to verify that compile-errors have a column-property ([@nknapp](https://github.com/nknapp)) - c7dc353

-[Commits](https://github.com/lawnsea/handlebars.js/compare/v4.0.6...v4.0.7)
+[Commits](https://github.com/wycats/handlebars.js/compare/v4.0.6...v4.0.7)

 ## v4.0.6 - November 12th, 2016
+
 - [#1243](https://github.com/wycats/handlebars.js/pull/1243) - Walk up data frames for nested @partial-block ([@lawnsea](https://github.com/lawnsea))
 - [#1210](https://github.com/wycats/handlebars.js/pull/1210) - Add a new lightweight package based on handlebars in the README ([@kabirbaidhya](https://github.com/kabirbaidhya))
 - [#1187](https://github.com/wycats/handlebars.js/pull/1187) - Ensure that existing blockParams and depths are respected on dupe programs ([@charleso](https://github.com/charleso))
@@ -354,7 +574,7 @@ Compatibility notes:
 - [#1177](https://github.com/wycats/handlebars.js/pull/1177) - Preserve License info in Closure Compiler ([@gennadiylitvinyuk](https://github.com/gennadiylitvinyuk))
 - [#1171](https://github.com/wycats/handlebars.js/pull/1171) - Contributing doc fix: failing thats -> failing tests ([@paulfalgout](https://github.com/paulfalgout))
 - [#1166](https://github.com/wycats/handlebars.js/pull/1166) - Update license date ([@timwangdev](https://github.com/timwangdev))
-  Update jsfiddle to point to latest - 959ee55 (originally dfc7554 by [@kpdecker](https://github.com/kpdecker))
+- Update jsfiddle to point to latest - 959ee55 (originally dfc7554 by [@kpdecker](https://github.com/kpdecker))
 - [#1163](https://github.com/wycats/handlebars.js/pull/1163) - Fix typos on decorators-api.md. ([@adjohnson916](https://github.com/adjohnson916))
 - Drop extra Error params - 8c19874 (originally 63fdb92 by [@kpdecker](https://github.com/kpdecker))
 - [#1153](https://github.com/wycats/handlebars.js/pull/1153) - Add documentation for running tests to contributing.md ([@ryanmurakami](https://github.com/ryanmurakami))
@@ -368,6 +588,7 @@ Compatibility notes:
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.5...v4.0.6)

 ## v4.0.5 - November 19th, 2015
+
 - [#1132](https://github.com/wycats/handlebars.js/pull/1132) - Update uglify-js to avoid vulnerability ([@plynchnlm](https://github.com/plynchnlm))
 - [#1129](https://github.com/wycats/handlebars.js/issues/1129) - Minified lib returns an empty string ([@bricss](https://github.com/bricss))
 - Return current handlebars instance from noConflict - 685cf92
@@ -380,12 +601,14 @@ Compatibility notes:
 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.4...v4.0.5)

 ## v4.0.4 - October 29th, 2015
+
 - [#1121](https://github.com/wycats/handlebars.js/pull/1121) - Include partial name in 'undefined partial' exception message ([@shinypb](https://github.com/shinypb))
 - [#1125](https://github.com/wycats/handlebars.js/pull/1125) - Add promised-handlebars to "in-the-wild"-list ([@nknapp](https://github.com/nknapp))

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.3...v4.0.4)

 ## v4.0.3 - September 23rd, 2015
+
 - [#1099](https://github.com/wycats/handlebars.js/issues/1099) - @partial-block is overridden ([@btmorex](https://github.com/btmorex))
 - [#1093](https://github.com/wycats/handlebars.js/issues/1093) - #each skips iteration on undefined values ([@florianpilz](https://github.com/florianpilz))
 - [#1092](https://github.com/wycats/handlebars.js/issues/1092) - Square braces in key name ([@distantnative](https://github.com/distantnative))
@@ -393,22 +616,26 @@ Compatibility notes:
 - [#1090](https://github.com/wycats/handlebars.js/pull/1090) - grammar fixes in 4.0.0 release notes ([@nikolas](https://github.com/nikolas))

 Compatibility notes:
+
 - `each` iteration with `undefined` values has been restored to the 3.0 behaviors. Helper calls with undefined context values will now execute against an arbitrary empty object to avoid executing against global object in non-strict mode.
 - `]` can now be included in `[]` wrapped identifiers by escaping with `\`. Any `[]` identifiers that include `\` will now have to properly escape these values.

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.2...v4.0.3)

 ## v4.0.2 - September 4th, 2015
+
 - [#1089](https://github.com/wycats/handlebars.js/issues/1089) - "Failover content" not working in multiple levels of inline partials ([@michaellopez](https://github.com/michaellopez))

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.1...v4.0.2)

 ## v4.0.1 - September 2nd, 2015
+
 - Fix failure when using decorators in partials - 05b82a2

 [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.0...v4.0.1)

 ## v4.0.0 - September 1st, 2015
+
 - [#1082](https://github.com/wycats/handlebars.js/pull/1082) - Decorators and Inline Partials ([@kpdecker](https://github.com/kpdecker))
 - [#1076](https://github.com/wycats/handlebars.js/pull/1076) - Implement partial blocks ([@kpdecker](https://github.com/kpdecker))
 - [#1087](https://github.com/wycats/handlebars.js/pull/1087) - Fix #each when last object entry has empty key ([@denniskuczynski](https://github.com/denniskuczynski))
@@ -444,6 +671,7 @@ Compatibility notes:
 - Fix location information for programs - [93faffa](https://github.com/wycats/handlebars.js/commit/93faffa)

 Compatibility notes:
+
 - Depthed paths are now conditionally pushed on to the stack. If the helper uses the same context, then a new stack is not created. This leads to behavior that better matches expectations for helpers like `if` that do not seem to alter the context. Any instances of `../` in templates will need to be checked for the correct behavior under 4.0.0. In general templates will either reduce the number of `../` instances or leave them as is. See [#1028](https://github.com/wycats/handlebars.js/issues/1028).
 - The `=` character is now HTML escaped. This closes a potential exploit case when using unquoted attributes, i.e. `<div foo={{bar}}>`. In general it's recommended that attributes always be quoted when their values are generated from a mustache to avoid any potential exploit surfaces.
 - AST constructors have been dropped in favor of plain old javascript objects
@@ -452,22 +680,25 @@ Compatibility notes:
 [Commits](https://github.com/wycats/handlebars.js/compare/v3.0.3...v4.0.0)

 ## v3.0.3 - April 28th, 2015
+
 - [#1004](https://github.com/wycats/handlebars.js/issues/1004) - Latest version breaks with RequireJS (global is undefined) ([@boskee](https://github.com/boskee))

 [Commits](https://github.com/wycats/handlebars.js/compare/v3.0.2...v3.0.3)

 ## v3.0.2 - April 20th, 2015
+
 - [#998](https://github.com/wycats/handlebars.js/pull/998) - Add full support for es6 ([@kpdecker](https://github.com/kpdecker))
 - [#994](https://github.com/wycats/handlebars.js/issues/994) - Access Handlebars.Visitor in browser ([@tamlyn](https://github.com/tamlyn))
 - [#990](https://github.com/wycats/handlebars.js/issues/990) - Allow passing null/undefined literals subexpressions ([@blimmer](https://github.com/blimmer))
 - [#989](https://github.com/wycats/handlebars.js/issues/989) - Source-map error with requirejs ([@SteppeEagle](https://github.com/SteppeEagle))
- [#967](https://github.com/wycats/handlebars.js/issues/967) - can't access "this" property  ([@75lb](https://github.com/75lb))
+- [#967](https://github.com/wycats/handlebars.js/issues/967) - can't access "this" property ([@75lb](https://github.com/75lb))
 - Use captureStackTrace for error handler - a009a97
 - Ignore branches tested without coverage monitoring - 37a664b

 [Commits](https://github.com/wycats/handlebars.js/compare/v3.0.1...v3.0.2)

 ## v3.0.1 - March 24th, 2015
+
 - [#984](https://github.com/wycats/handlebars.js/pull/984) - Adding documentation for passing arguments into partials ([@johneke](https://github.com/johneke))
 - [#973](https://github.com/wycats/handlebars.js/issues/973) - version 3 is slower than version 2 ([@elover](https://github.com/elover))
 - [#966](https://github.com/wycats/handlebars.js/issues/966) - "handlebars --version" does not work with v3.0.0 ([@abloomston](https://github.com/abloomston))
@@ -477,6 +708,7 @@ Compatibility notes:
 [Commits](https://github.com/wycats/handlebars.js/compare/v3.0.0...v3.0.1)

 ## v3.0.0 - February 10th, 2015
+
 - [#941](https://github.com/wycats/handlebars.js/pull/941) - Add support for dynamic partial names ([@kpdecker](https://github.com/kpdecker))
 - [#940](https://github.com/wycats/handlebars.js/pull/940) - Add missing reserved words so compiler knows to use array syntax: ([@mattflaschen](https://github.com/mattflaschen))
 - [#938](https://github.com/wycats/handlebars.js/pull/938) - Fix example using #with helper ([@diwo](https://github.com/diwo))
@@ -506,6 +738,7 @@ Compatibility notes:
 - Lookup partials when undefined - 617dd57

 Compatibility notes:
+
 - Runtime breaking changes. Must match 3.x runtime and precompiler.
 - The AST has been upgraded to a public API.
  - There are a number of changes to this, but the format is now documented in docs/compiler-api.md
@@ -515,6 +748,7 @@ Compatibility notes:
 - `SafeString` is now duck typed on `toHTML`

 New Features:
+
 - noConflict
 - Source Maps
 - Block Params
@@ -527,6 +761,7 @@ New Features:
 [Commits](https://github.com/wycats/handlebars.js/compare/v2.0.0...v3.0.0)

 ## v2.0.0 - September 1st, 2014
+
 - Update jsfiddle to 2.0.0-beta.1 - 0670f65
 - Add contrib note regarding handlebarsjs.com docs - 4d17e3c
 - Play nice with gemspec version numbers - 64d5481
@@ -534,6 +769,7 @@ New Features:
 [Commits](https://github.com/wycats/handlebars.js/compare/v2.0.0-beta.1...v2.0.0)

 ## v2.0.0-beta.1 - August 26th, 2014
+
 - [#787](https://github.com/wycats/handlebars.js/pull/787) - Remove whitespace surrounding standalone statements ([@kpdecker](https://github.com/kpdecker))
 - [#827](https://github.com/wycats/handlebars.js/issues/827) - Render false literal as “false” ([@scoot557](https://github.com/scoot557))
 - [#767](https://github.com/wycats/handlebars.js/issues/767) - Subexpressions bug with hash and context ([@evensoul](https://github.com/evensoul))
@@ -543,7 +779,7 @@ New Features:
  - [#837](https://github.com/wycats/handlebars.js/issues/837) - Strange input for custom helper ( foo.bar == false when foo is undefined ) ([@zordius](https://github.com/zordius))
 - [#819](https://github.com/wycats/handlebars.js/pull/819) - Implement recursive field lookup ([@kpdecker](https://github.com/kpdecker))
 - [#764](https://github.com/wycats/handlebars.js/issues/764) - This reference not working for helpers ([@kpdecker](https://github.com/kpdecker))
- [#773](https://github.com/wycats/handlebars.js/issues/773) - Implicit parameters in {{#each}} introduces a peculiarity in helpers calling convention  ([@Bertrand](https://github.com/Bertrand))
+- [#773](https://github.com/wycats/handlebars.js/issues/773) - Implicit parameters in {{#each}} introduces a peculiarity in helpers calling convention ([@Bertrand](https://github.com/Bertrand))
 - [#783](https://github.com/wycats/handlebars.js/issues/783) - helperMissing and consistency for different expression types ([@ErisDS](https://github.com/ErisDS))
 - [#795](https://github.com/wycats/handlebars.js/pull/795) - Turn the precompile script into a wrapper around a module. ([@jwietelmann](https://github.com/jwietelmann))
 - [#823](https://github.com/wycats/handlebars.js/pull/823) - Support inverse sections on the with helper ([@dan-manges](https://github.com/dan-manges))
@@ -556,13 +792,14 @@ New Features:
 - Fix compiler program de-duping - 9e3f824

 Compatibility notes:
+
 - The default build now outputs a generic UMD wrapper. This should be transparent change but may cause issues in some environments.
 - Runtime compatibility breaks in both directions. Ensure that both compiler and client are upgraded to 2.0.0-beta.1 or higher at the same time.
  - `programWithDepth` has been removed an instead an array of context values is passed to fields needing depth lookups.
 - `false` values are now printed to output rather than silently dropped
 - Lines containing only block statements and whitespace are now removed. This matches the Mustache spec but may cause issues with code that expects whitespace to exist but would not otherwise.
 - Partials that are standalone will now indent their rendered content
- `AST.ProgramNode`'s signature has changed. 
+- `AST.ProgramNode`'s signature has changed.
 - Numerious methods/features removed from pseudo-API classes
  - `JavaScriptCompiler.register`
  - `JavaScriptCompiler.replaceStack` no longer supports non-inline replace
@@ -577,11 +814,13 @@ Compatibility notes:
 [Commits](https://github.com/wycats/handlebars.js/compare/v2.0.0-alpha.4...v2.0.0-beta.1)

 ## v2.0.0-alpha.4 - May 19th, 2014
+
 - Expose setup wrappers for compiled templates - 3638874

 [Commits](https://github.com/wycats/handlebars.js/compare/v2.0.0-alpha.3...v2.0.0-alpha.4)

 ## v2.0.0-alpha.3 - May 19th, 2014
+
 - [#797](https://github.com/wycats/handlebars.js/pull/797) - Pass full helper ID to helperMissing when options are provided ([@tomdale](https://github.com/tomdale))
 - [#793](https://github.com/wycats/handlebars.js/pull/793) - Ensure isHelper is coerced to a boolean ([@mmun](https://github.com/mmun))
 - Refactor template init logic - 085e5e1
@@ -589,6 +828,7 @@ Compatibility notes:
 [Commits](https://github.com/wycats/handlebars.js/compare/v2.0.0-alpha.2...v2.0.0-alpha.3)

 ## v2.0.0-alpha.2 - March 6th, 2014
+
 - [#756](https://github.com/wycats/handlebars.js/pull/756) - fix bug in IE<=8 (no Array::map), closes #751 ([@jenseng](https://github.com/jenseng))
 - [#749](https://github.com/wycats/handlebars.js/pull/749) - properly handle multiple subexpressions in the same hash, fixes #748 ([@jenseng](https://github.com/jenseng))
 - [#743](https://github.com/wycats/handlebars.js/issues/743) - subexpression confusion/problem? ([@waynedpj](https://github.com/waynedpj))
@@ -598,11 +838,13 @@ Compatibility notes:
 - Temporarily kill the AWS publish CI step - 8347ee2

 Compatibility notes:
+
 - A JSON polyfill is required to run the compiler under IE8 and below. It's recommended that the precompiler be used in lieu of running the compiler on these legacy environments.

 [Commits](https://github.com/wycats/handlebars.js/compare/v2.0.0-alpha.1...v2.0.0-alpha.2)

 ## v2.0.0-alpha.1 - February 10th, 2014
+
 - [#182](https://github.com/wycats/handlebars.js/pull/182) - Allow passing hash parameters to partials ([@kpdecker](https://github.com/kpdecker))
 - [#392](https://github.com/wycats/handlebars.js/pull/392) - Access to root context in partials and helpers ([@kpdecker](https://github.com/kpdecker))
 - [#472](https://github.com/wycats/handlebars.js/issues/472) - Helpers cannot have decimal parameters ([@kayleg](https://github.com/kayleg))
@@ -625,6 +867,7 @@ Compatibility notes:
 - [#704](https://github.com/wycats/handlebars.js/pull/704) - JavaScript Compiler Cleanup ([@blakeembrey](https://github.com/blakeembrey))

 Compatibility notes:
+
 - `helperMissing` helper no longer has the indexed name argument. Helper name is now available via `options.name`.
 - Precompiler output has changed, which breaks compatibility with prior versions of the runtime and precompiled output.
 - `JavaScriptCompiler.compilerInfo` now returns generic objects rather than javascript source.
@@ -637,6 +880,7 @@ Compatibility notes:
 [Commits](https://github.com/wycats/handlebars.js/compare/v1.3.0...v2.0.0-alpha.1)

 ## v1.3.0 - January 1st, 2014
+
 - [#690](https://github.com/wycats/handlebars.js/pull/690) - Added support for subexpressions ([@machty](https://github.com/machty))
 - [#696](https://github.com/wycats/handlebars.js/pull/696) - Fix for reserved keyword "default" ([@nateirwin](https://github.com/nateirwin))
 - [#692](https://github.com/wycats/handlebars.js/pull/692) - add line numbers to nodes when parsing ([@fivetanley](https://github.com/fivetanley))
@@ -651,12 +895,14 @@ Compatibility notes:
 [Commits](https://github.com/wycats/handlebars.js/compare/v1.2.1...v1.3.0)

 ## v1.2.1 - December 26th, 2013
+
 - [#684](https://github.com/wycats/handlebars.js/pull/684) - Allow any number of trailing characters for valid JavaScript variable ([@blakeembrey](https://github.com/blakeembrey))
 - [#686](https://github.com/wycats/handlebars.js/pull/686) - Falsy AMD module names in version 1.2.0 ([@kpdecker](https://github.com/kpdecker))

 [Commits](https://github.com/wycats/handlebars.js/compare/v1.2.0...v1.2.1)

 ## v1.2.0 - December 23rd, 2013
+
 - [#675](https://github.com/wycats/handlebars.js/issues/675) - Cannot compile empty template for partial ([@erwinw](https://github.com/erwinw))
 - [#677](https://github.com/wycats/handlebars.js/issues/677) - Triple brace statements fail under IE ([@hamzaCM](https://github.com/hamzaCM))
 - [#655](https://github.com/wycats/handlebars.js/issues/655) - Loading Handlebars using bower ([@niki4810](https://github.com/niki4810))
@@ -676,6 +922,7 @@ Compatibility notes:
 - Fix handling of boolean escape in MustacheNode - b4968bb

 Compatibility notes:
+
 - `@index` and `@first` are now supported for `each` iteration on objects
 - `Handlebars.VM.checkRevision` and `Handlebars.JavaScriptCompiler.prototype.compilerInfo` now available to modify the version checking behavior.
 - Browserify users may link to the runtime library via `require('handlebars/runtime')`
@@ -717,16 +964,15 @@ Compatibility notes:
 - [#571](https://github.com/wycats/handlebars.js/issues/571) - uglify upgrade breaks compatibility with older versions of node
 - [#587](https://github.com/wycats/handlebars.js/issues/587) - Partial inside partial breaks?

-
 Compatibility notes:
- The project now includes separate artifacts for AMD, CommonJS, and global objects. 
+
+- The project now includes separate artifacts for AMD, CommonJS, and global objects.
  - AMD: Users may load the bundled `handlebars.amd.js` or `handlebars.runtime.amd.js` files or load individual modules directly. AMD users should also note that the handlebars object is exposed via the `default` field on the imported object. This [gist](https://gist.github.com/wycats/7417be0dc361a69d5916) provides some discussion of possible compatibility shims.
  - CommonJS/Node: Node loading occurs as normal via `require`
  - Globals: The `handlebars.js` and `handlebars.runtime.js` files should behave in the same manner as the v1.0.12 / 1.0.0 release.
- Build artifacts have been removed from the repository. [npm][npm], [components/handlebars.js][components], [cdnjs][cdnjs], or the [builds page][builds-page] should now be used as the source of built artifacts. 
+- Build artifacts have been removed from the repository. [npm][npm], [components/handlebars.js][components], [cdnjs][cdnjs], or the [builds page][builds-page] should now be used as the source of built artifacts.
 - Context-stored helpers are now always passed the `options` hash. Previously no-argument helpers did not have this argument.

-
 [Commits](https://github.com/wycats/handlebars.js/compare/v1.0.12...v1.1.0)

 ## v1.0.12 / 1.0.0 - May 31 2013
@@ -744,6 +990,7 @@ Compatibility notes:
 - Docs updates

 Compatibility notes:
+
 - The parser is now stricter on `{{{`, requiring that the end token be `}}}`. Templates that do not
  follow this convention should add the additional brace value.
 - Code that relies on global the namespace being muted when custom helpers or partials are passed will need to explicitly pass an `undefined` value for any helpers that should not be available.
@@ -810,13 +1057,13 @@ changed.
 Instead of:

 ```js
-template(context, helpers, partials, [data])
+template(context, helpers, partials, [data]);
 ```

 Use:

 ```js
-template(context, {helpers: helpers, partials: partials, data: data})
+template(context, { helpers: helpers, partials: partials, data: data });
 ```

 [builds-page]: http://builds.handlebarsjs.com.s3.amazonaws.com/index.html
@@ -1,7 +1,8 @@
 {
  "extends": [
    "../.eslintrc.js",
-    "plugin:es5/no-es2015"
+    "plugin:es5/no-es2015",
+    "prettier"
  ],
  "plugins": [
    "es5"
@@ -13,6 +14,7 @@
    "shouldCompileTo": true,
    "shouldCompileToWithPartials": true,
    "shouldThrow": true,
+    "expectTemplate": true,
    "compileWithPartials": true,
    "console": true,
    "require": true,
@@ -26,16 +28,20 @@
    "start": true,
    "stop": true,
    "ok": true,
+    "sinon": true,
    "strictEqual": true,
-    "define": true
+    "define": true,
+    "expect": true,
+    "chai": true
  },
  "env": {
    "mocha": true
  },
  "rules": {
    // Disabling for tests, for now.
-    "no-path-concat": 0,
+    "no-path-concat": "off",

-    "no-var": 0
+    "no-var": "off",
+    "dot-notation": "off"
  }
-}
+}
@@ -18,13 +18,16 @@
        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/env/json2.js"></script>
-    <script src="/spec/env/require.js"></script>
+    <script src="/spec/vendor/json2.js"></script>
+    <script src="/spec/vendor/require.js"></script>

    <script src="/spec/env/common.js"></script>
    <script>
@@ -19,13 +19,16 @@
        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/env/json2.js"></script>
-    <script src="/spec/env/require.js"></script>
+    <script src="/spec/vendor/json2.js"></script>
+    <script src="/spec/vendor/require.js"></script>

    <script src="/spec/env/common.js"></script>
    <script>
@@ -109,8 +112,7 @@
              failedTests.push({
                name: test.title,
                result: false,
-                message: err.message,
-                stack: err.stack,
+                message: err.message,                stack: err.stack,
                titles: flattenTitles(test)
              });
            }
@@ -0,0 +1,6 @@
+{{#someHelper true}}
+ <div>Some known helper</div>
+    {{#anotherHelper true}}
+    <div>Another known helper</div>
+    {{/anotherHelper}}
+{{/someHelper}}
@@ -0,0 +1 @@
+<div>This is a test</div>
@@ -0,0 +1 @@
+<div>Test Partial</div>
@@ -7,44 +7,102 @@ describe('ast', function() {

  describe('BlockStatement', function() {
    it('should throw on mustache mismatch', function() {
-      shouldThrow(function() {
-        handlebarsEnv.parse('\n  {{#foo}}{{/bar}}');
-      }, Handlebars.Exception, "foo doesn't match bar - 2:5");
+      shouldThrow(
+        function() {
+          handlebarsEnv.parse('\n  {{#foo}}{{/bar}}');
+        },
+        Handlebars.Exception,
+        "foo doesn't match bar - 2:5"
+      );
    });
  });

  describe('helpers', function() {
    describe('#helperExpression', function() {
      it('should handle mustache statements', function() {
-        equals(AST.helpers.helperExpression({type: 'MustacheStatement', params: [], hash: undefined}), false);
-        equals(AST.helpers.helperExpression({type: 'MustacheStatement', params: [1], hash: undefined}), true);
-        equals(AST.helpers.helperExpression({type: 'MustacheStatement', params: [], hash: {}}), true);
+        equals(
+          AST.helpers.helperExpression({
+            type: 'MustacheStatement',
+            params: [],
+            hash: undefined
+          }),
+          false
+        );
+        equals(
+          AST.helpers.helperExpression({
+            type: 'MustacheStatement',
+            params: [1],
+            hash: undefined
+          }),
+          true
+        );
+        equals(
+          AST.helpers.helperExpression({
+            type: 'MustacheStatement',
+            params: [],
+            hash: {}
+          }),
+          true
+        );
      });
      it('should handle block statements', function() {
-        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);
+        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);
+        equals(AST.helpers.helperExpression({ type: 'SubExpression' }), true);
      });
      it('should work with non-helper nodes', function() {
-        equals(AST.helpers.helperExpression({type: 'Program'}), false);
+        equals(AST.helpers.helperExpression({ type: 'Program' }), false);

-        equals(AST.helpers.helperExpression({type: 'PartialStatement'}), false);
-        equals(AST.helpers.helperExpression({type: 'ContentStatement'}), false);
-        equals(AST.helpers.helperExpression({type: 'CommentStatement'}), false);
+        equals(
+          AST.helpers.helperExpression({ type: 'PartialStatement' }),
+          false
+        );
+        equals(
+          AST.helpers.helperExpression({ type: 'ContentStatement' }),
+          false
+        );
+        equals(
+          AST.helpers.helperExpression({ type: 'CommentStatement' }),
+          false
+        );

-        equals(AST.helpers.helperExpression({type: 'PathExpression'}), false);
+        equals(AST.helpers.helperExpression({ type: 'PathExpression' }), false);

-        equals(AST.helpers.helperExpression({type: 'StringLiteral'}), false);
-        equals(AST.helpers.helperExpression({type: 'NumberLiteral'}), false);
-        equals(AST.helpers.helperExpression({type: 'BooleanLiteral'}), false);
-        equals(AST.helpers.helperExpression({type: 'UndefinedLiteral'}), false);
-        equals(AST.helpers.helperExpression({type: 'NullLiteral'}), false);
+        equals(AST.helpers.helperExpression({ type: 'StringLiteral' }), false);
+        equals(AST.helpers.helperExpression({ type: 'NumberLiteral' }), false);
+        equals(AST.helpers.helperExpression({ type: 'BooleanLiteral' }), false);
+        equals(
+          AST.helpers.helperExpression({ type: 'UndefinedLiteral' }),
+          false
+        );
+        equals(AST.helpers.helperExpression({ type: 'NullLiteral' }), false);

-        equals(AST.helpers.helperExpression({type: 'Hash'}), false);
-        equals(AST.helpers.helperExpression({type: 'HashPair'}), false);
+        equals(AST.helpers.helperExpression({ type: 'Hash' }), false);
+        equals(AST.helpers.helperExpression({ type: 'HashPair' }), false);
      });
    });
  });
@@ -61,17 +119,18 @@ describe('ast', function() {

    /* eslint-disable no-multi-spaces */
    ast = Handlebars.parse(
-              'line 1 {{line1Token}}\n'             // 1
-            + ' line 2 {{line2token}}\n'            // 2
-            + ' line 3 {{#blockHelperOnLine3}}\n'   // 3
-            + 'line 4{{line4token}}\n'              // 4
-            + 'line5{{else}}\n'                     // 5
-            + '{{line6Token}}\n'                    // 6
-            + '{{/blockHelperOnLine3}}\n'           // 7
-            + '{{#open}}\n'                         // 8
-            + '{{else inverse}}\n'                  // 9
-            + '{{else}}\n'                          // 10
-            + '{{/open}}');                         // 11
+      'line 1 {{line1Token}}\n' + // 1
+      ' line 2 {{line2token}}\n' + // 2
+      ' line 3 {{#blockHelperOnLine3}}\n' + // 3
+      'line 4{{line4token}}\n' + // 4
+      'line5{{else}}\n' + // 5
+      '{{line6Token}}\n' + // 6
+      '{{/blockHelperOnLine3}}\n' + // 7
+      '{{#open}}\n' + // 8
+      '{{else inverse}}\n' + // 9
+      '{{else}}\n' + // 10
+        '{{/open}}'
+    ); // 11
    /* eslint-enable no-multi-spaces */
    body = ast.body;

@@ -92,35 +151,35 @@ describe('ast', 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() {
-       var blockHelperNode = body[5];
-       testColumns(blockHelperNode, 3, 7, 8, 23);
-     });
+    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() {
-       var blockHelperNode = body[5],
-           program = blockHelperNode.program;
+    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);
-     });
+      testColumns(program, 3, 5, 31, 5);
+    });

-     it('correctly records the line numbers of an inverse of a block helper', function() {
-       var blockHelperNode = body[5],
-           inverse = blockHelperNode.inverse;
+    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);
-     });
+      testColumns(inverse, 5, 7, 13, 0);
+    });

-     it('correctly records the line number of chained inverses', function() {
-       var chainInverseNode = body[7];
+    it('correctly records the line number of chained inverses', function() {
+      var chainInverseNode = body[7];

-       testColumns(chainInverseNode.program, 8, 9, 9, 0);
-       testColumns(chainInverseNode.inverse, 9, 10, 16, 0);
-       testColumns(chainInverseNode.inverse.body[0].program, 9, 10, 16, 0);
-       testColumns(chainInverseNode.inverse.body[0].inverse, 10, 11, 8, 0);
-     });
+      testColumns(chainInverseNode.program, 8, 9, 9, 0);
+      testColumns(chainInverseNode.inverse, 9, 10, 16, 0);
+      testColumns(chainInverseNode.inverse.body[0].program, 9, 10, 16, 0);
+      testColumns(chainInverseNode.inverse.body[0].inverse, 10, 11, 8, 0);
+    });
  });

  describe('whitespace control', function() {
@@ -149,7 +208,9 @@ describe('ast', function() {
      });

      it('block statements', function() {
-        var ast = Handlebars.parseWithoutProcessing(' {{# comment~}} \nfoo\n {{~/comment}}');
+        var ast = Handlebars.parseWithoutProcessing(
+          ' {{# comment~}} \nfoo\n {{~/comment}}'
+        );

        equals(ast.body[0].value, ' ');
        equals(ast.body[1].program.body[0].value, ' \nfoo\n ');
@@ -167,7 +228,9 @@ describe('ast', function() {
    });
    describe('blocks - parseWithoutProcessing', function() {
      it('block mustaches', function() {
-        var ast = Handlebars.parseWithoutProcessing(' {{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '),
+        var ast = Handlebars.parseWithoutProcessing(
+            ' {{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '
+          ),
          block = ast.body[1];

        equals(ast.body[0].value, ' ');
@@ -178,13 +241,17 @@ describe('ast', function() {
        equals(ast.body[2].value, ' ');
      });
      it('initial block mustaches', function() {
-        var ast = Handlebars.parseWithoutProcessing('{{# comment}} \nfoo\n {{/comment}}'),
+        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}}'),
+        var ast = Handlebars.parseWithoutProcessing(
+            '{{# comment}} \n{{foo}}\n {{/comment}}'
+          ),
          block = ast.body[0];

        equals(block.program.body[0].value, ' \n');
@@ -192,7 +259,9 @@ describe('ast', function() {
        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}}'),
+        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];

@@ -202,8 +271,10 @@ describe('ast', function() {
        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];
+        var ast = Handlebars.parseWithoutProcessing(
+            'test\n{{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '
+          ),
+          block = ast.body[1];

        equals(ast.body[0].omit, undefined);

@@ -215,8 +286,10 @@ describe('ast', function() {
    });
    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];
+        var ast = Handlebars.parse(
+            ' {{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '
+          ),
+          block = ast.body[1];

        equals(ast.body[0].value, '');

@@ -227,22 +300,24 @@ describe('ast', function() {
      });
      it('marks initial block mustaches as standalone', function() {
        var ast = Handlebars.parse('{{# comment}} \nfoo\n {{/comment}}'),
-            block = ast.body[0];
+          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];
+          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];
+        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, '');

@@ -252,9 +327,11 @@ describe('ast', function() {
        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];
+        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);

@@ -264,9 +341,11 @@ describe('ast', function() {
        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];
+        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  ');
@@ -275,8 +354,10 @@ describe('ast', function() {
      });

      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];
+        var ast = Handlebars.parse(
+            'test\n{{# comment}} \nfoo\n {{else}} \n  bar \n  {{/comment}} '
+          ),
+          block = ast.body[1];

        equals(ast.body[0].omit, undefined);

@@ -348,4 +429,3 @@ describe('ast', function() {
    });
  });
 });
-
@@ -6,300 +6,591 @@ beforeEach(function() {

 describe('basic context', function() {
  it('most basic', function() {
-    shouldCompileTo('{{foo}}', { foo: 'foo' }, 'foo');
+    expectTemplate('{{foo}}')
+      .withInput({ foo: 'foo' })
+      .toCompileTo('foo');
  });

  it('escaping', function() {
-    shouldCompileTo('\\{{foo}}', { foo: 'food' }, '{{foo}}');
-    shouldCompileTo('content \\{{foo}}', { foo: 'food' }, 'content {{foo}}');
-    shouldCompileTo('\\\\{{foo}}', { foo: 'food' }, '\\food');
-    shouldCompileTo('content \\\\{{foo}}', { foo: 'food' }, 'content \\food');
-    shouldCompileTo('\\\\ {{foo}}', { foo: 'food' }, '\\\\ food');
+    expectTemplate('\\{{foo}}')
+      .withInput({ foo: 'food' })
+      .toCompileTo('{{foo}}');
+
+    expectTemplate('content \\{{foo}}')
+      .withInput({ foo: 'food' })
+      .toCompileTo('content {{foo}}');
+
+    expectTemplate('\\\\{{foo}}')
+      .withInput({ foo: 'food' })
+      .toCompileTo('\\food');
+
+    expectTemplate('content \\\\{{foo}}')
+      .withInput({ foo: 'food' })
+      .toCompileTo('content \\food');
+
+    expectTemplate('\\\\ {{foo}}')
+      .withInput({ foo: 'food' })
+      .toCompileTo('\\\\ food');
  });

  it('compiling with a basic context', function() {
-    shouldCompileTo('Goodbye\n{{cruel}}\n{{world}}!', {cruel: 'cruel', world: 'world'}, 'Goodbye\ncruel\nworld!',
-                    'It works if all the required keys are provided');
+    expectTemplate('Goodbye\n{{cruel}}\n{{world}}!')
+      .withInput({
+        cruel: 'cruel',
+        world: 'world'
+      })
+      .withMessage('It works if all the required keys are provided')
+      .toCompileTo('Goodbye\ncruel\nworld!');
  });

  it('compiling with a string context', function() {
-    shouldCompileTo('{{.}}{{length}}', 'bye', 'bye3');
+    expectTemplate('{{.}}{{length}}')
+      .withInput('bye')
+      .toCompileTo('bye3');
  });

  it('compiling with an undefined context', function() {
-    shouldCompileTo('Goodbye\n{{cruel}}\n{{world.bar}}!', undefined, 'Goodbye\n\n!');
+    expectTemplate('Goodbye\n{{cruel}}\n{{world.bar}}!')
+      .withInput(undefined)
+      .toCompileTo('Goodbye\n\n!');

-    shouldCompileTo('{{#unless foo}}Goodbye{{../test}}{{test2}}{{/unless}}', undefined, 'Goodbye');
+    expectTemplate('{{#unless foo}}Goodbye{{../test}}{{test2}}{{/unless}}')
+      .withInput(undefined)
+      .toCompileTo('Goodbye');
  });

  it('comments', function() {
-    shouldCompileTo('{{! Goodbye}}Goodbye\n{{cruel}}\n{{world}}!',
-      {cruel: 'cruel', world: 'world'}, 'Goodbye\ncruel\nworld!',
-      'comments are ignored');
+    expectTemplate('{{! Goodbye}}Goodbye\n{{cruel}}\n{{world}}!')
+      .withInput({
+        cruel: 'cruel',
+        world: 'world'
+      })
+      .withMessage('comments are ignored')
+      .toCompileTo('Goodbye\ncruel\nworld!');

-    shouldCompileTo('    {{~! comment ~}}      blah', {}, 'blah');
-    shouldCompileTo('    {{~!-- long-comment --~}}      blah', {}, 'blah');
-    shouldCompileTo('    {{! comment ~}}      blah', {}, '    blah');
-    shouldCompileTo('    {{!-- long-comment --~}}      blah', {}, '    blah');
-    shouldCompileTo('    {{~! comment}}      blah', {}, '      blah');
-    shouldCompileTo('    {{~!-- long-comment --}}      blah', {}, '      blah');
+    expectTemplate('    {{~! comment ~}}      blah').toCompileTo('blah');
+
+    expectTemplate('    {{~!-- long-comment --~}}      blah').toCompileTo(
+      'blah'
+    );
+
+    expectTemplate('    {{! comment ~}}      blah').toCompileTo('    blah');
+
+    expectTemplate('    {{!-- long-comment --~}}      blah').toCompileTo(
+      '    blah'
+    );
+
+    expectTemplate('    {{~! comment}}      blah').toCompileTo('      blah');
+
+    expectTemplate('    {{~!-- long-comment --}}      blah').toCompileTo(
+      '      blah'
+    );
  });

  it('boolean', function() {
    var string = '{{#goodbye}}GOODBYE {{/goodbye}}cruel {{world}}!';
-    shouldCompileTo(string, {goodbye: true, world: 'world'}, 'GOODBYE cruel world!',
-                    'booleans show the contents when true');
+    expectTemplate(string)
+      .withInput({
+        goodbye: true,
+        world: 'world'
+      })
+      .withMessage('booleans show the contents when true')
+      .toCompileTo('GOODBYE cruel world!');

-    shouldCompileTo(string, {goodbye: false, world: 'world'}, 'cruel world!',
-                    'booleans do not show the contents when false');
+    expectTemplate(string)
+      .withInput({
+        goodbye: false,
+        world: 'world'
+      })
+      .withMessage('booleans do not show the contents when false')
+      .toCompileTo('cruel world!');
  });

  it('zeros', function() {
-    shouldCompileTo('num1: {{num1}}, num2: {{num2}}', {num1: 42, num2: 0},
-        'num1: 42, num2: 0');
-    shouldCompileTo('num: {{.}}', 0, 'num: 0');
-    shouldCompileTo('num: {{num1/num2}}', {num1: {num2: 0}}, 'num: 0');
+    expectTemplate('num1: {{num1}}, num2: {{num2}}')
+      .withInput({
+        num1: 42,
+        num2: 0
+      })
+      .toCompileTo('num1: 42, num2: 0');
+
+    expectTemplate('num: {{.}}')
+      .withInput(0)
+      .toCompileTo('num: 0');
+
+    expectTemplate('num: {{num1/num2}}')
+      .withInput({ num1: { num2: 0 } })
+      .toCompileTo('num: 0');
  });
+
  it('false', function() {
    /* eslint-disable no-new-wrappers */
-    shouldCompileTo('val1: {{val1}}, val2: {{val2}}', {val1: false, val2: new Boolean(false)}, 'val1: false, val2: false');
-    shouldCompileTo('val: {{.}}', false, 'val: false');
-    shouldCompileTo('val: {{val1/val2}}', {val1: {val2: false}}, 'val: false');
+    expectTemplate('val1: {{val1}}, val2: {{val2}}')
+      .withInput({
+        val1: false,
+        val2: new Boolean(false)
+      })
+      .toCompileTo('val1: false, val2: false');

-    shouldCompileTo('val1: {{{val1}}}, val2: {{{val2}}}', {val1: false, val2: new Boolean(false)}, 'val1: false, val2: false');
-    shouldCompileTo('val: {{{val1/val2}}}', {val1: {val2: false}}, 'val: false');
+    expectTemplate('val: {{.}}')
+      .withInput(false)
+      .toCompileTo('val: false');
+
+    expectTemplate('val: {{val1/val2}}')
+      .withInput({ val1: { val2: false } })
+      .toCompileTo('val: false');
+
+    expectTemplate('val1: {{{val1}}}, val2: {{{val2}}}')
+      .withInput({
+        val1: false,
+        val2: new Boolean(false)
+      })
+      .toCompileTo('val1: false, val2: false');
+
+    expectTemplate('val: {{{val1/val2}}}')
+      .withInput({ val1: { val2: false } })
+      .toCompileTo('val: false');
    /* eslint-enable */
  });

  it('should handle undefined and null', function() {
-    shouldCompileTo('{{awesome undefined null}}',
-        {
-          awesome: function(_undefined, _null, options) {
-            return (_undefined === undefined) + ' ' + (_null === null) + ' ' + (typeof options);
-          }
-        },
-        'true true object');
-    shouldCompileTo('{{undefined}}',
-        {
-          'undefined': function() {
-            return 'undefined!';
-          }
-        },
-        'undefined!');
-    shouldCompileTo('{{null}}',
-        {
-          'null': function() {
-            return 'null!';
-          }
-        },
-        'null!');
+    expectTemplate('{{awesome undefined null}}')
+      .withInput({
+        awesome: function(_undefined, _null, options) {
+          return (
+            (_undefined === undefined) +
+            ' ' +
+            (_null === null) +
+            ' ' +
+            typeof options
+          );
+        }
+      })
+      .toCompileTo('true true object');
+
+    expectTemplate('{{undefined}}')
+      .withInput({
+        undefined: function() {
+          return 'undefined!';
+        }
+      })
+      .toCompileTo('undefined!');
+
+    expectTemplate('{{null}}')
+      .withInput({
+        null: function() {
+          return 'null!';
+        }
+      })
+      .toCompileTo('null!');
  });

  it('newlines', function() {
-      shouldCompileTo("Alan's\nTest", {}, "Alan's\nTest");
-      shouldCompileTo("Alan's\rTest", {}, "Alan's\rTest");
+    expectTemplate("Alan's\nTest").toCompileTo("Alan's\nTest");
+
+    expectTemplate("Alan's\rTest").toCompileTo("Alan's\rTest");
  });

  it('escaping text', function() {
-    shouldCompileTo("Awesome's", {}, "Awesome's", "text is escaped so that it doesn't get caught on single quotes");
-    shouldCompileTo('Awesome\\', {}, 'Awesome\\', "text is escaped so that the closing quote can't be ignored");
-    shouldCompileTo('Awesome\\\\ foo', {}, 'Awesome\\\\ foo', "text is escaped so that it doesn't mess up backslashes");
-    shouldCompileTo('Awesome {{foo}}', {foo: '\\'}, 'Awesome \\', "text is escaped so that it doesn't mess up backslashes");
-    shouldCompileTo(" ' ' ", {}, " ' ' ", 'double quotes never produce invalid javascript');
+    expectTemplate("Awesome's")
+      .withMessage(
+        "text is escaped so that it doesn't get caught on single quotes"
+      )
+      .toCompileTo("Awesome's");
+
+    expectTemplate('Awesome\\')
+      .withMessage("text is escaped so that the closing quote can't be ignored")
+      .toCompileTo('Awesome\\');
+
+    expectTemplate('Awesome\\\\ foo')
+      .withMessage("text is escaped so that it doesn't mess up backslashes")
+      .toCompileTo('Awesome\\\\ foo');
+
+    expectTemplate('Awesome {{foo}}')
+      .withInput({ foo: '\\' })
+      .withMessage("text is escaped so that it doesn't mess up backslashes")
+      .toCompileTo('Awesome \\');
+
+    expectTemplate(" ' ' ")
+      .withMessage('double quotes never produce invalid javascript')
+      .toCompileTo(" ' ' ");
  });

  it('escaping expressions', function() {
-   shouldCompileTo('{{{awesome}}}', {awesome: '&\'\\<>'}, '&\'\\<>',
-          "expressions with 3 handlebars aren't escaped");
+    expectTemplate('{{{awesome}}}')
+      .withInput({ awesome: "&'\\<>" })
+      .withMessage("expressions with 3 handlebars aren't escaped")
+      .toCompileTo("&'\\<>");

-   shouldCompileTo('{{&awesome}}', {awesome: '&\'\\<>'}, '&\'\\<>',
-          "expressions with {{& handlebars aren't escaped");
+    expectTemplate('{{&awesome}}')
+      .withInput({ awesome: "&'\\<>" })
+      .withMessage("expressions with {{& handlebars aren't escaped")
+      .toCompileTo("&'\\<>");

-   shouldCompileTo('{{awesome}}', {awesome: "&\"'`\\<>"}, '&amp;&quot;&#x27;&#x60;\\&lt;&gt;',
-          'by default expressions should be escaped');
+    expectTemplate('{{awesome}}')
+      .withInput({ awesome: '&"\'`\\<>' })
+      .withMessage('by default expressions should be escaped')
+      .toCompileTo('&amp;&quot;&#x27;&#x60;\\&lt;&gt;');

-   shouldCompileTo('{{awesome}}', {awesome: 'Escaped, <b> looks like: &lt;b&gt;'}, 'Escaped, &lt;b&gt; looks like: &amp;lt;b&amp;gt;',
-          'escaping should properly handle amperstands');
+    expectTemplate('{{awesome}}')
+      .withInput({ awesome: 'Escaped, <b> looks like: &lt;b&gt;' })
+      .withMessage('escaping should properly handle amperstands')
+      .toCompileTo('Escaped, &lt;b&gt; looks like: &amp;lt;b&amp;gt;');
  });

  it("functions returning safestrings shouldn't be escaped", function() {
-    var hash = {awesome: function() { return new Handlebars.SafeString('&\'\\<>'); }};
-    shouldCompileTo('{{awesome}}', hash, '&\'\\<>',
-        "functions returning safestrings aren't escaped");
+    expectTemplate('{{awesome}}')
+      .withInput({
+        awesome: function() {
+          return new Handlebars.SafeString("&'\\<>");
+        }
+      })
+      .withMessage("functions returning safestrings aren't escaped")
+      .toCompileTo("&'\\<>");
  });

  it('functions', function() {
-    shouldCompileTo('{{awesome}}', {awesome: function() { return 'Awesome'; }}, 'Awesome',
-                    'functions are called and render their output');
-    shouldCompileTo('{{awesome}}', {awesome: function() { return this.more; }, more: 'More awesome'}, 'More awesome',
-                    'functions are bound to the context');
+    expectTemplate('{{awesome}}')
+      .withInput({
+        awesome: function() {
+          return 'Awesome';
+        }
+      })
+      .withMessage('functions are called and render their output')
+      .toCompileTo('Awesome');
+
+    expectTemplate('{{awesome}}')
+      .withInput({
+        awesome: function() {
+          return this.more;
+        },
+        more: 'More awesome'
+      })
+      .withMessage('functions are bound to the context')
+      .toCompileTo('More awesome');
  });

  it('functions with context argument', function() {
-    shouldCompileTo('{{awesome frank}}',
-        {awesome: function(context) { return context; },
-          frank: 'Frank'},
-        'Frank', 'functions are called with context arguments');
+    expectTemplate('{{awesome frank}}')
+      .withInput({
+        awesome: function(context) {
+          return context;
+        },
+        frank: 'Frank'
+      })
+      .withMessage('functions are called with context arguments')
+      .toCompileTo('Frank');
  });
+
  it('pathed functions with context argument', function() {
-    shouldCompileTo('{{bar.awesome frank}}',
-        {bar: {awesome: function(context) { return context; }},
-          frank: 'Frank'},
-        'Frank', 'functions are called with context arguments');
+    expectTemplate('{{bar.awesome frank}}')
+      .withInput({
+        bar: {
+          awesome: function(context) {
+            return context;
+          }
+        },
+        frank: 'Frank'
+      })
+      .withMessage('functions are called with context arguments')
+      .toCompileTo('Frank');
  });
+
  it('depthed functions with context argument', function() {
-    shouldCompileTo('{{#with frank}}{{../awesome .}}{{/with}}',
-        {awesome: function(context) { return context; },
-          frank: 'Frank'},
-        'Frank', 'functions are called with context arguments');
+    expectTemplate('{{#with frank}}{{../awesome .}}{{/with}}')
+      .withInput({
+        awesome: function(context) {
+          return context;
+        },
+        frank: 'Frank'
+      })
+      .withMessage('functions are called with context arguments')
+      .toCompileTo('Frank');
  });

  it('block functions with context argument', function() {
-    shouldCompileTo('{{#awesome 1}}inner {{.}}{{/awesome}}',
-        {awesome: function(context, options) { return options.fn(context); }},
-        'inner 1', 'block functions are called with context and options');
+    expectTemplate('{{#awesome 1}}inner {{.}}{{/awesome}}')
+      .withInput({
+        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() {
-    shouldCompileTo('{{#with value}}{{#../awesome 1}}inner {{.}}{{/../awesome}}{{/with}}',
-        {value: true, awesome: function(context, options) { return options.fn(context); }},
-        'inner 1', 'block functions are called with context and options');
+    expectTemplate(
+      '{{#with value}}{{#../awesome 1}}inner {{.}}{{/../awesome}}{{/with}}'
+    )
+      .withInput({
+        value: true,
+        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() {
-    shouldCompileTo('{{#awesome}}inner{{/awesome}}',
-        {awesome: function(options) { return options.fn(this); }},
-        'inner', 'block functions are called with options');
-  });
-  it('pathed block functions without context argument', function() {
-    shouldCompileTo('{{#foo.awesome}}inner{{/foo.awesome}}',
-        {foo: {awesome: function() { return this; }}},
-        'inner', 'block functions are called with options');
-  });
-  it('depthed block functions without context argument', function() {
-    shouldCompileTo('{{#with value}}{{#../awesome}}inner{{/../awesome}}{{/with}}',
-        {value: true, awesome: function() { return this; }},
-        'inner', 'block functions are called with options');
+    expectTemplate('{{#awesome}}inner{{/awesome}}')
+      .withInput({
+        awesome: function(options) {
+          return options.fn(this);
+        }
+      })
+      .withMessage('block functions are called with options')
+      .toCompileTo('inner');
  });

+  it('pathed block functions without context argument', function() {
+    expectTemplate('{{#foo.awesome}}inner{{/foo.awesome}}')
+      .withInput({
+        foo: {
+          awesome: function() {
+            return this;
+          }
+        }
+      })
+      .withMessage('block functions are called with options')
+      .toCompileTo('inner');
+  });
+
+  it('depthed block functions without context argument', function() {
+    expectTemplate(
+      '{{#with value}}{{#../awesome}}inner{{/../awesome}}{{/with}}'
+    )
+      .withInput({
+        value: true,
+        awesome: function() {
+          return this;
+        }
+      })
+      .withMessage('block functions are called with options')
+      .toCompileTo('inner');
+  });

  it('paths with hyphens', function() {
-    shouldCompileTo('{{foo-bar}}', {'foo-bar': 'baz'}, 'baz', 'Paths can contain hyphens (-)');
-    shouldCompileTo('{{foo.foo-bar}}', {foo: {'foo-bar': 'baz'}}, 'baz', 'Paths can contain hyphens (-)');
-    shouldCompileTo('{{foo/foo-bar}}', {foo: {'foo-bar': 'baz'}}, 'baz', 'Paths can contain hyphens (-)');
+    expectTemplate('{{foo-bar}}')
+      .withInput({ 'foo-bar': 'baz' })
+      .withMessage('Paths can contain hyphens (-)')
+      .toCompileTo('baz');
+
+    expectTemplate('{{foo.foo-bar}}')
+      .withInput({ foo: { 'foo-bar': 'baz' } })
+      .withMessage('Paths can contain hyphens (-)')
+      .toCompileTo('baz');
+
+    expectTemplate('{{foo/foo-bar}}')
+      .withInput({ foo: { 'foo-bar': 'baz' } })
+      .withMessage('Paths can contain hyphens (-)')
+      .toCompileTo('baz');
  });

  it('nested paths', function() {
-    shouldCompileTo('Goodbye {{alan/expression}} world!', {alan: {expression: 'beautiful'}},
-                    'Goodbye beautiful world!', 'Nested paths access nested objects');
+    expectTemplate('Goodbye {{alan/expression}} world!')
+      .withInput({ alan: { expression: 'beautiful' } })
+      .withMessage('Nested paths access nested objects')
+      .toCompileTo('Goodbye beautiful world!');
  });

  it('nested paths with empty string value', function() {
-    shouldCompileTo('Goodbye {{alan/expression}} world!', {alan: {expression: ''}},
-                    'Goodbye  world!', 'Nested paths access nested objects with empty string');
+    expectTemplate('Goodbye {{alan/expression}} world!')
+      .withInput({ alan: { expression: '' } })
+      .withMessage('Nested paths access nested objects with empty string')
+      .toCompileTo('Goodbye  world!');
  });

  it('literal paths', function() {
-    shouldCompileTo('Goodbye {{[@alan]/expression}} world!', {'@alan': {expression: 'beautiful'}},
-        'Goodbye beautiful world!', 'Literal paths can be used');
-    shouldCompileTo('Goodbye {{[foo bar]/expression}} world!', {'foo bar': {expression: 'beautiful'}},
-        'Goodbye beautiful world!', 'Literal paths can be used');
+    expectTemplate('Goodbye {{[@alan]/expression}} world!')
+      .withInput({ '@alan': { expression: 'beautiful' } })
+      .withMessage('Literal paths can be used')
+      .toCompileTo('Goodbye beautiful world!');
+
+    expectTemplate('Goodbye {{[foo bar]/expression}} world!')
+      .withInput({ 'foo bar': { expression: 'beautiful' } })
+      .withMessage('Literal paths can be used')
+      .toCompileTo('Goodbye beautiful world!');
  });

  it('literal references', function() {
-    shouldCompileTo('Goodbye {{[foo bar]}} world!', {'foo bar': 'beautiful'}, 'Goodbye beautiful world!');
-    shouldCompileTo('Goodbye {{"foo bar"}} world!', {'foo bar': 'beautiful'}, 'Goodbye beautiful world!');
-    shouldCompileTo("Goodbye {{'foo bar'}} world!", {'foo bar': 'beautiful'}, 'Goodbye beautiful world!');
-    shouldCompileTo('Goodbye {{"foo[bar"}} world!', {'foo[bar': 'beautiful'}, 'Goodbye beautiful world!');
-    shouldCompileTo('Goodbye {{"foo\'bar"}} world!', {"foo'bar": 'beautiful'}, 'Goodbye beautiful world!');
-    shouldCompileTo("Goodbye {{'foo\"bar'}} world!", {'foo"bar': 'beautiful'}, 'Goodbye beautiful world!');
+    expectTemplate('Goodbye {{[foo bar]}} world!')
+      .withInput({ 'foo bar': 'beautiful' })
+      .toCompileTo('Goodbye beautiful world!');
+
+    expectTemplate('Goodbye {{"foo bar"}} world!')
+      .withInput({ 'foo bar': 'beautiful' })
+      .toCompileTo('Goodbye beautiful world!');
+
+    expectTemplate("Goodbye {{'foo bar'}} world!")
+      .withInput({ 'foo bar': 'beautiful' })
+      .toCompileTo('Goodbye beautiful world!');
+
+    expectTemplate('Goodbye {{"foo[bar"}} world!')
+      .withInput({ 'foo[bar': 'beautiful' })
+      .toCompileTo('Goodbye beautiful world!');
+
+    expectTemplate('Goodbye {{"foo\'bar"}} world!')
+      .withInput({ "foo'bar": 'beautiful' })
+      .toCompileTo('Goodbye beautiful world!');
+
+    expectTemplate("Goodbye {{'foo\"bar'}} world!")
+      .withInput({ 'foo"bar': 'beautiful' })
+      .toCompileTo('Goodbye beautiful world!');
  });

  it("that current context path ({{.}}) doesn't hit helpers", function() {
-    shouldCompileTo('test: {{.}}', [null, {helper: 'awesome'}], 'test: ');
+    expectTemplate('test: {{.}}')
+      .withInput(null)
+      .withHelpers({ helper: 'awesome' })
+      .toCompileTo('test: ');
  });

  it('complex but empty paths', function() {
-    shouldCompileTo('{{person/name}}', {person: {name: null}}, '');
-    shouldCompileTo('{{person/name}}', {person: {}}, '');
+    expectTemplate('{{person/name}}')
+      .withInput({ person: { name: null } })
+      .toCompileTo('');
+
+    expectTemplate('{{person/name}}')
+      .withInput({ person: {} })
+      .toCompileTo('');
  });

  it('this keyword in paths', function() {
-    var string = '{{#goodbyes}}{{this}}{{/goodbyes}}';
-    var hash = {goodbyes: ['goodbye', 'Goodbye', 'GOODBYE']};
-    shouldCompileTo(string, hash, 'goodbyeGoodbyeGOODBYE',
-      'This keyword in paths evaluates to current context');
+    expectTemplate('{{#goodbyes}}{{this}}{{/goodbyes}}')
+      .withInput({ goodbyes: ['goodbye', 'Goodbye', 'GOODBYE'] })
+      .withMessage('This keyword in paths evaluates to current context')
+      .toCompileTo('goodbyeGoodbyeGOODBYE');

-    string = '{{#hellos}}{{this/text}}{{/hellos}}';
-    hash = {hellos: [{text: 'hello'}, {text: 'Hello'}, {text: 'HELLO'}]};
-    shouldCompileTo(string, hash, 'helloHelloHELLO', 'This keyword evaluates in more complex paths');
+    expectTemplate('{{#hellos}}{{this/text}}{{/hellos}}')
+      .withInput({
+        hellos: [{ text: 'hello' }, { text: 'Hello' }, { text: 'HELLO' }]
+      })
+      .withMessage('This keyword evaluates in more complex paths')
+      .toCompileTo('helloHelloHELLO');
  });

  it('this keyword nested inside path', function() {
-    shouldThrow(function() {
-      CompilerContext.compile('{{#hellos}}{{text/this/foo}}{{/hellos}}');
-    }, Error, 'Invalid path: text/this - 1:13');
+    expectTemplate('{{#hellos}}{{text/this/foo}}{{/hellos}}').toThrow(
+      Error,
+      'Invalid path: text/this - 1:13'
+    );

-    shouldCompileTo('{{[this]}}', {'this': 'bar'}, 'bar');
-    shouldCompileTo('{{text/[this]}}', {text: {'this': 'bar'}}, 'bar');
+    expectTemplate('{{[this]}}')
+      .withInput({ this: 'bar' })
+      .toCompileTo('bar');
+
+    expectTemplate('{{text/[this]}}')
+      .withInput({ text: { this: 'bar' } })
+      .toCompileTo('bar');
  });

  it('this keyword in helpers', function() {
-    var helpers = {foo: function(value) {
+    var helpers = {
+      foo: function(value) {
        return 'bar ' + value;
-    }};
-    var string = '{{#goodbyes}}{{foo this}}{{/goodbyes}}';
-    var hash = {goodbyes: ['goodbye', 'Goodbye', 'GOODBYE']};
-    shouldCompileTo(string, [hash, helpers], 'bar goodbyebar Goodbyebar GOODBYE',
-      'This keyword in paths evaluates to current context');
+      }
+    };

-    string = '{{#hellos}}{{foo this/text}}{{/hellos}}';
-    hash = {hellos: [{text: 'hello'}, {text: 'Hello'}, {text: 'HELLO'}]};
-    shouldCompileTo(string, [hash, helpers], 'bar hellobar Hellobar HELLO', 'This keyword evaluates in more complex paths');
+    expectTemplate('{{#goodbyes}}{{foo this}}{{/goodbyes}}')
+      .withInput({ goodbyes: ['goodbye', 'Goodbye', 'GOODBYE'] })
+      .withHelpers(helpers)
+      .withMessage('This keyword in paths evaluates to current context')
+      .toCompileTo('bar goodbyebar Goodbyebar GOODBYE');
+
+    expectTemplate('{{#hellos}}{{foo this/text}}{{/hellos}}')
+      .withInput({
+        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() {
-    var string = '{{#hellos}}{{foo text/this/foo}}{{/hellos}}';
-    shouldThrow(function() {
-      CompilerContext.compile(string);
-    }, Error, 'Invalid path: text/this - 1:17');
+    expectTemplate('{{#hellos}}{{foo text/this/foo}}{{/hellos}}').toThrow(
+      Error,
+      'Invalid path: text/this - 1:17'
+    );

-    shouldCompileTo(
-        '{{foo [this]}}',
-        {foo: function(value) { return value; }, 'this': 'bar'},
-        'bar');
-    shouldCompileTo(
-        '{{foo text/[this]}}',
-        {foo: function(value) { return value; }, text: {'this': 'bar'}},
-        'bar');
+    expectTemplate('{{foo [this]}}')
+      .withInput({
+        foo: function(value) {
+          return value;
+        },
+        this: 'bar'
+      })
+      .toCompileTo('bar');
+
+    expectTemplate('{{foo text/[this]}}')
+      .withInput({
+        foo: function(value) {
+          return value;
+        },
+        text: { this: 'bar' }
+      })
+      .toCompileTo('bar');
  });

  it('pass string literals', function() {
-    shouldCompileTo('{{"foo"}}', {}, '');
-    shouldCompileTo('{{"foo"}}', { foo: 'bar' }, 'bar');
-    shouldCompileTo('{{#"foo"}}{{.}}{{/"foo"}}', { foo: ['bar', 'baz'] }, 'barbaz');
+    expectTemplate('{{"foo"}}').toCompileTo('');
+
+    expectTemplate('{{"foo"}}')
+      .withInput({ foo: 'bar' })
+      .toCompileTo('bar');
+
+    expectTemplate('{{#"foo"}}{{.}}{{/"foo"}}')
+      .withInput({
+        foo: ['bar', 'baz']
+      })
+      .toCompileTo('barbaz');
  });

  it('pass number literals', function() {
-    shouldCompileTo('{{12}}', {}, '');
-    shouldCompileTo('{{12}}', { '12': 'bar' }, 'bar');
-    shouldCompileTo('{{12.34}}', {}, '');
-    shouldCompileTo('{{12.34}}', { '12.34': 'bar' }, 'bar');
-    shouldCompileTo('{{12.34 1}}', { '12.34': function(arg) { return 'bar' + arg; } }, 'bar1');
+    expectTemplate('{{12}}').toCompileTo('');
+
+    expectTemplate('{{12}}')
+      .withInput({ '12': 'bar' })
+      .toCompileTo('bar');
+
+    expectTemplate('{{12.34}}').toCompileTo('');
+
+    expectTemplate('{{12.34}}')
+      .withInput({ '12.34': 'bar' })
+      .toCompileTo('bar');
+
+    expectTemplate('{{12.34 1}}')
+      .withInput({
+        '12.34': function(arg) {
+          return 'bar' + arg;
+        }
+      })
+      .toCompileTo('bar1');
  });

  it('pass boolean literals', function() {
-    shouldCompileTo('{{true}}', {}, '');
-    shouldCompileTo('{{true}}', { '': 'foo' }, '');
-    shouldCompileTo('{{false}}', { 'false': 'foo' }, 'foo');
+    expectTemplate('{{true}}').toCompileTo('');
+
+    expectTemplate('{{true}}')
+      .withInput({ '': 'foo' })
+      .toCompileTo('');
+
+    expectTemplate('{{false}}')
+      .withInput({ false: 'foo' })
+      .toCompileTo('foo');
  });

  it('should handle literals in subexpression', function() {
-    var helpers = {
-      foo: function(arg) {
+    expectTemplate('{{foo (false)}}')
+      .withInput({
+        false: function() {
+          return 'bar';
+        }
+      })
+      .withHelper('foo', function(arg) {
        return arg;
-      }
-    };
-    shouldCompileTo('{{foo (false)}}', [{ 'false': function() { return 'bar'; } }, helpers], 'bar');
+      })
+      .toCompileTo('bar');
  });
 });
@@ -1,308 +1,405 @@
 describe('blocks', function() {
  it('array', function() {
    var string = '{{#goodbyes}}{{text}}! {{/goodbyes}}cruel {{world}}!';
-    var hash = {goodbyes: [{text: 'goodbye'}, {text: 'Goodbye'}, {text: 'GOODBYE'}], world: 'world'};
-    shouldCompileTo(string, hash, 'goodbye! Goodbye! GOODBYE! cruel world!',
-                    'Arrays iterate over the contents when not empty');

-    shouldCompileTo(string, {goodbyes: [], world: 'world'}, 'cruel world!',
-                    'Arrays ignore the contents when empty');
+    expectTemplate(string)
+      .withInput({
+        goodbyes: [
+          { text: 'goodbye' },
+          { text: 'Goodbye' },
+          { text: 'GOODBYE' }
+        ],
+        world: 'world'
+      })
+      .withMessage('Arrays iterate over the contents when not empty')
+      .toCompileTo('goodbye! Goodbye! GOODBYE! cruel world!');
+
+    expectTemplate(string)
+      .withInput({
+        goodbyes: [],
+        world: 'world'
+      })
+      .withMessage('Arrays ignore the contents when empty')
+      .toCompileTo('cruel world!');
  });

  it('array without data', function() {
-    var string = '{{#goodbyes}}{{text}}{{/goodbyes}} {{#goodbyes}}{{text}}{{/goodbyes}}';
-    var hash = {goodbyes: [{text: 'goodbye'}, {text: 'Goodbye'}, {text: 'GOODBYE'}], world: 'world'};
-    shouldCompileTo(string, [hash,,, false], 'goodbyeGoodbyeGOODBYE goodbyeGoodbyeGOODBYE');
+    expectTemplate(
+      '{{#goodbyes}}{{text}}{{/goodbyes}} {{#goodbyes}}{{text}}{{/goodbyes}}'
+    )
+      .withInput({
+        goodbyes: [
+          { text: 'goodbye' },
+          { text: 'Goodbye' },
+          { text: 'GOODBYE' }
+        ],
+        world: 'world'
+      })
+      .withCompileOptions({ compat: false })
+      .toCompileTo('goodbyeGoodbyeGOODBYE goodbyeGoodbyeGOODBYE');
  });

  it('array with @index', function() {
-    var string = '{{#goodbyes}}{{@index}}. {{text}}! {{/goodbyes}}cruel {{world}}!';
-    var hash = {goodbyes: [{text: 'goodbye'}, {text: 'Goodbye'}, {text: 'GOODBYE'}], world: 'world'};
-
-    var template = CompilerContext.compile(string);
-    var result = template(hash);
-
-    equal(result, '0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!', 'The @index variable is used');
+    expectTemplate(
+      '{{#goodbyes}}{{@index}}. {{text}}! {{/goodbyes}}cruel {{world}}!'
+    )
+      .withInput({
+        goodbyes: [
+          { text: 'goodbye' },
+          { text: 'Goodbye' },
+          { text: 'GOODBYE' }
+        ],
+        world: 'world'
+      })
+      .withMessage('The @index variable is used')
+      .toCompileTo('0. goodbye! 1. Goodbye! 2. GOODBYE! cruel world!');
  });

  it('empty block', function() {
    var string = '{{#goodbyes}}{{/goodbyes}}cruel {{world}}!';
-    var hash = {goodbyes: [{text: 'goodbye'}, {text: 'Goodbye'}, {text: 'GOODBYE'}], world: 'world'};
-    shouldCompileTo(string, hash, 'cruel world!',
-                    'Arrays iterate over the contents when not empty');

-    shouldCompileTo(string, {goodbyes: [], world: 'world'}, 'cruel world!',
-                    'Arrays ignore the contents when empty');
+    expectTemplate(string)
+      .withInput({
+        goodbyes: [
+          { text: 'goodbye' },
+          { text: 'Goodbye' },
+          { text: 'GOODBYE' }
+        ],
+        world: 'world'
+      })
+      .withMessage('Arrays iterate over the contents when not empty')
+      .toCompileTo('cruel world!');
+
+    expectTemplate(string)
+      .withInput({
+        goodbyes: [],
+        world: 'world'
+      })
+      .withMessage('Arrays ignore the contents when empty')
+      .toCompileTo('cruel world!');
  });

  it('block with complex lookup', function() {
-    var string = '{{#goodbyes}}{{text}} cruel {{../name}}! {{/goodbyes}}';
-    var hash = {name: 'Alan', goodbyes: [{text: 'goodbye'}, {text: 'Goodbye'}, {text: 'GOODBYE'}]};
-
-    shouldCompileTo(string, hash, 'goodbye cruel Alan! Goodbye cruel Alan! GOODBYE cruel Alan! ',
-                    'Templates can access variables in contexts up the stack with relative path syntax');
+    expectTemplate('{{#goodbyes}}{{text}} cruel {{../name}}! {{/goodbyes}}')
+      .withInput({
+        name: 'Alan',
+        goodbyes: [
+          { text: 'goodbye' },
+          { text: 'Goodbye' },
+          { text: 'GOODBYE' }
+        ]
+      })
+      .withMessage(
+        'Templates can access variables in contexts up the stack with relative path syntax'
+      )
+      .toCompileTo(
+        'goodbye cruel Alan! Goodbye cruel Alan! GOODBYE cruel Alan! '
+      );
  });

  it('multiple blocks with complex lookup', function() {
-    var string = '{{#goodbyes}}{{../name}}{{../name}}{{/goodbyes}}';
-    var hash = {name: 'Alan', goodbyes: [{text: 'goodbye'}, {text: 'Goodbye'}, {text: 'GOODBYE'}]};
-
-    shouldCompileTo(string, hash, 'AlanAlanAlanAlanAlanAlan');
+    expectTemplate('{{#goodbyes}}{{../name}}{{../name}}{{/goodbyes}}')
+      .withInput({
+        name: 'Alan',
+        goodbyes: [
+          { text: 'goodbye' },
+          { text: 'Goodbye' },
+          { text: 'GOODBYE' }
+        ]
+      })
+      .toCompileTo('AlanAlanAlanAlanAlanAlan');
  });

  it('block with complex lookup using nested context', function() {
-    var string = '{{#goodbyes}}{{text}} cruel {{foo/../name}}! {{/goodbyes}}';
-
-    shouldThrow(function() {
-      CompilerContext.compile(string);
-    }, Error);
+    expectTemplate(
+      '{{#goodbyes}}{{text}} cruel {{foo/../name}}! {{/goodbyes}}'
+    ).toThrow(Error);
  });

  it('block with deep nested complex lookup', function() {
-    var string = '{{#outer}}Goodbye {{#inner}}cruel {{../sibling}} {{../../omg}}{{/inner}}{{/outer}}';
-    var hash = {omg: 'OMG!', outer: [{ sibling: 'sad', inner: [{ text: 'goodbye' }] }] };
-
-    shouldCompileTo(string, hash, 'Goodbye cruel sad OMG!');
+    expectTemplate(
+      '{{#outer}}Goodbye {{#inner}}cruel {{../sibling}} {{../../omg}}{{/inner}}{{/outer}}'
+    )
+      .withInput({
+        omg: 'OMG!',
+        outer: [{ sibling: 'sad', inner: [{ text: 'goodbye' }] }]
+      })
+      .toCompileTo('Goodbye cruel sad OMG!');
  });

  it('works with cached blocks', function() {
-    var template = CompilerContext.compile('{{#each person}}{{#with .}}{{first}} {{last}}{{/with}}{{/each}}', {data: false});
-
-    var result = template({person: [{first: 'Alan', last: 'Johnson'}, {first: 'Alan', last: 'Johnson'}]});
-    equals(result, 'Alan JohnsonAlan Johnson');
+    expectTemplate(
+      '{{#each person}}{{#with .}}{{first}} {{last}}{{/with}}{{/each}}'
+    )
+      .withCompileOptions({ data: false })
+      .withInput({
+        person: [
+          { first: 'Alan', last: 'Johnson' },
+          { first: 'Alan', last: 'Johnson' }
+        ]
+      })
+      .toCompileTo('Alan JohnsonAlan Johnson');
  });

  describe('inverted sections', function() {
    it('inverted sections with unset value', function() {
-      var string = '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}';
-      var hash = {};
-      shouldCompileTo(string, hash, 'Right On!', "Inverted section rendered when value isn't set.");
+      expectTemplate(
+        '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}'
+      )
+        .withMessage("Inverted section rendered when value isn't set.")
+        .toCompileTo('Right On!');
    });

    it('inverted section with false value', function() {
-      var string = '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}';
-      var hash = {goodbyes: false};
-      shouldCompileTo(string, hash, 'Right On!', 'Inverted section rendered when value is false.');
+      expectTemplate(
+        '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}'
+      )
+        .withInput({ goodbyes: false })
+        .withMessage('Inverted section rendered when value is false.')
+        .toCompileTo('Right On!');
    });

    it('inverted section with empty set', function() {
-      var string = '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}';
-      var hash = {goodbyes: []};
-      shouldCompileTo(string, hash, 'Right On!', 'Inverted section rendered when value is empty set.');
+      expectTemplate(
+        '{{#goodbyes}}{{this}}{{/goodbyes}}{{^goodbyes}}Right On!{{/goodbyes}}'
+      )
+        .withInput({ goodbyes: [] })
+        .withMessage('Inverted section rendered when value is empty set.')
+        .toCompileTo('Right On!');
    });

    it('block inverted sections', function() {
-      shouldCompileTo('{{#people}}{{name}}{{^}}{{none}}{{/people}}', {none: 'No people'},
-        'No people');
+      expectTemplate('{{#people}}{{name}}{{^}}{{none}}{{/people}}')
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people');
    });
+
    it('chained inverted sections', function() {
-      shouldCompileTo('{{#people}}{{name}}{{else if none}}{{none}}{{/people}}', {none: 'No people'},
-        'No people');
-      shouldCompileTo('{{#people}}{{name}}{{else if nothere}}fail{{else unless nothere}}{{none}}{{/people}}', {none: 'No people'},
-        'No people');
-      shouldCompileTo('{{#people}}{{name}}{{else if none}}{{none}}{{else}}fail{{/people}}', {none: 'No people'},
-        'No people');
+      expectTemplate('{{#people}}{{name}}{{else if none}}{{none}}{{/people}}')
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people');
+
+      expectTemplate(
+        '{{#people}}{{name}}{{else if nothere}}fail{{else unless nothere}}{{none}}{{/people}}'
+      )
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people');
+
+      expectTemplate(
+        '{{#people}}{{name}}{{else if none}}{{none}}{{else}}fail{{/people}}'
+      )
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people');
    });
+
    it('chained inverted sections with mismatch', function() {
-      shouldThrow(function() {
-        shouldCompileTo('{{#people}}{{name}}{{else if none}}{{none}}{{/if}}', {none: 'No people'},
-          'No people');
-      }, Error);
+      expectTemplate(
+        '{{#people}}{{name}}{{else if none}}{{none}}{{/if}}'
+      ).toThrow(Error);
    });

    it('block inverted sections with empty arrays', function() {
-      shouldCompileTo('{{#people}}{{name}}{{^}}{{none}}{{/people}}', {none: 'No people', people: []},
-        'No people');
+      expectTemplate('{{#people}}{{name}}{{^}}{{none}}{{/people}}')
+        .withInput({
+          none: 'No people',
+          people: []
+        })
+        .toCompileTo('No people');
    });
  });

  describe('standalone sections', function() {
    it('block standalone else sections', function() {
-      shouldCompileTo('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n', {none: 'No people'},
-        'No people\n');
-      shouldCompileTo('{{#none}}\n{{.}}\n{{^}}\n{{none}}\n{{/none}}\n', {none: 'No people'},
-        'No people\n');
-      shouldCompileTo('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n', {none: 'No people'},
-        'No people\n');
+      expectTemplate('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n')
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people\n');
+
+      expectTemplate('{{#none}}\n{{.}}\n{{^}}\n{{none}}\n{{/none}}\n')
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people\n');
+
+      expectTemplate('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n')
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people\n');
    });
+
    it('block standalone else sections can be disabled', function() {
-      shouldCompileTo(
-        '{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n',
-        [{none: 'No people'}, {}, {}, {ignoreStandalone: true}],
-        '\nNo people\n\n');
-      shouldCompileTo(
-        '{{#none}}\n{{.}}\n{{^}}\nFail\n{{/none}}\n',
-        [{none: 'No people'}, {}, {}, {ignoreStandalone: true}],
-        '\nNo people\n\n');
+      expectTemplate('{{#people}}\n{{name}}\n{{^}}\n{{none}}\n{{/people}}\n')
+        .withInput({ none: 'No people' })
+        .withCompileOptions({ ignoreStandalone: true })
+        .toCompileTo('\nNo people\n\n');
+
+      expectTemplate('{{#none}}\n{{.}}\n{{^}}\nFail\n{{/none}}\n')
+        .withInput({ none: 'No people' })
+        .withCompileOptions({ ignoreStandalone: true })
+        .toCompileTo('\nNo people\n\n');
    });
+
    it('block standalone chained else sections', function() {
-      shouldCompileTo('{{#people}}\n{{name}}\n{{else if none}}\n{{none}}\n{{/people}}\n', {none: 'No people'},
-        'No people\n');
-      shouldCompileTo('{{#people}}\n{{name}}\n{{else if none}}\n{{none}}\n{{^}}\n{{/people}}\n', {none: 'No people'},
-        'No people\n');
+      expectTemplate(
+        '{{#people}}\n{{name}}\n{{else if none}}\n{{none}}\n{{/people}}\n'
+      )
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people\n');
+
+      expectTemplate(
+        '{{#people}}\n{{name}}\n{{else if none}}\n{{none}}\n{{^}}\n{{/people}}\n'
+      )
+        .withInput({ none: 'No people' })
+        .toCompileTo('No people\n');
    });
+
    it('should handle nesting', function() {
-      shouldCompileTo('{{#data}}\n{{#if true}}\n{{.}}\n{{/if}}\n{{/data}}\nOK.', {data: [1, 3, 5]}, '1\n3\n5\nOK.');
+      expectTemplate('{{#data}}\n{{#if true}}\n{{.}}\n{{/if}}\n{{/data}}\nOK.')
+        .withInput({
+          data: [1, 3, 5]
+        })
+        .toCompileTo('1\n3\n5\nOK.');
    });
  });

  describe('compat mode', function() {
    it('block with deep recursive lookup lookup', function() {
-      var string = '{{#outer}}Goodbye {{#inner}}cruel {{omg}}{{/inner}}{{/outer}}';
-      var hash = {omg: 'OMG!', outer: [{ inner: [{ text: 'goodbye' }] }] };
-
-      shouldCompileTo(string, [hash, undefined, undefined, true], 'Goodbye cruel OMG!');
+      expectTemplate(
+        '{{#outer}}Goodbye {{#inner}}cruel {{omg}}{{/inner}}{{/outer}}'
+      )
+        .withInput({ omg: 'OMG!', outer: [{ inner: [{ text: 'goodbye' }] }] })
+        .withCompileOptions({ compat: true })
+        .toCompileTo('Goodbye cruel OMG!');
    });
+
    it('block with deep recursive pathed lookup', function() {
-      var string = '{{#outer}}Goodbye {{#inner}}cruel {{omg.yes}}{{/inner}}{{/outer}}';
-      var hash = {omg: {yes: 'OMG!'}, outer: [{ inner: [{ yes: 'no', text: 'goodbye' }] }] };
-
-      shouldCompileTo(string, [hash, undefined, undefined, true], 'Goodbye cruel OMG!');
+      expectTemplate(
+        '{{#outer}}Goodbye {{#inner}}cruel {{omg.yes}}{{/inner}}{{/outer}}'
+      )
+        .withInput({
+          omg: { yes: 'OMG!' },
+          outer: [{ inner: [{ yes: 'no', text: 'goodbye' }] }]
+        })
+        .withCompileOptions({ compat: true })
+        .toCompileTo('Goodbye cruel OMG!');
    });
-    it('block with missed recursive lookup', function() {
-      var string = '{{#outer}}Goodbye {{#inner}}cruel {{omg.yes}}{{/inner}}{{/outer}}';
-      var hash = {omg: {no: 'OMG!'}, outer: [{ inner: [{ yes: 'no', text: 'goodbye' }] }] };

-      shouldCompileTo(string, [hash, undefined, undefined, true], 'Goodbye cruel ');
+    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' }] }]
+        })
+        .withCompileOptions({ compat: true })
+        .toCompileTo('Goodbye cruel ');
    });
  });

  describe('decorators', function() {
    it('should apply mustache decorators', function() {
-      var helpers = {
-        helper: function(options) {
+      expectTemplate('{{#helper}}{{*decorator}}{{/helper}}')
+        .withHelper('helper', function(options) {
          return options.fn.run;
-        }
-      };
-      var decorators = {
-        decorator: function(fn) {
+        })
+        .withDecorator('decorator', function(fn) {
          fn.run = 'success';
          return fn;
-        }
-      };
-      shouldCompileTo(
-          '{{#helper}}{{*decorator}}{{/helper}}',
-          {hash: {}, helpers: helpers, decorators: decorators},
-          'success');
+        })
+        .toCompileTo('success');
    });
+
    it('should apply allow undefined return', function() {
-      var helpers = {
-        helper: function(options) {
+      expectTemplate('{{#helper}}{{*decorator}}suc{{/helper}}')
+        .withHelper('helper', function(options) {
          return options.fn() + options.fn.run;
-        }
-      };
-      var decorators = {
-        decorator: function(fn) {
+        })
+        .withDecorator('decorator', function(fn) {
          fn.run = 'cess';
-        }
-      };
-      shouldCompileTo(
-          '{{#helper}}{{*decorator}}suc{{/helper}}',
-          {hash: {}, helpers: helpers, decorators: decorators},
-          'success');
+        })
+        .toCompileTo('success');
    });

    it('should apply block decorators', function() {
-      var helpers = {
-        helper: function(options) {
+      expectTemplate(
+        '{{#helper}}{{#*decorator}}success{{/decorator}}{{/helper}}'
+      )
+        .withHelper('helper', function(options) {
          return options.fn.run;
-        }
-      };
-      var decorators = {
-        decorator: function(fn, props, container, options) {
+        })
+        .withDecorator('decorator', function(fn, props, container, options) {
          fn.run = options.fn();
          return fn;
-        }
-      };
-      shouldCompileTo(
-          '{{#helper}}{{#*decorator}}success{{/decorator}}{{/helper}}',
-          {hash: {}, helpers: helpers, decorators: decorators},
-          'success');
+        })
+        .toCompileTo('success');
    });
+
    it('should support nested decorators', function() {
-      var helpers = {
-        helper: function(options) {
+      expectTemplate(
+        '{{#helper}}{{#*decorator}}{{#*nested}}suc{{/nested}}cess{{/decorator}}{{/helper}}'
+      )
+        .withHelper('helper', function(options) {
          return options.fn.run;
-        }
-      };
-      var decorators = {
-        decorator: function(fn, props, container, options) {
-          fn.run = options.fn.nested + options.fn();
-          return fn;
-        },
-        nested: function(fn, props, container, options) {
-          props.nested = options.fn();
-        }
-      };
-      shouldCompileTo(
-          '{{#helper}}{{#*decorator}}{{#*nested}}suc{{/nested}}cess{{/decorator}}{{/helper}}',
-          {hash: {}, helpers: helpers, decorators: decorators},
-          'success');
+        })
+        .withDecorators({
+          decorator: function(fn, props, container, options) {
+            fn.run = options.fn.nested + options.fn();
+            return fn;
+          },
+          nested: function(fn, props, container, options) {
+            props.nested = options.fn();
+          }
+        })
+        .toCompileTo('success');
    });

    it('should apply multiple decorators', function() {
-      var helpers = {
-        helper: function(options) {
+      expectTemplate(
+        '{{#helper}}{{#*decorator}}suc{{/decorator}}{{#*decorator}}cess{{/decorator}}{{/helper}}'
+      )
+        .withHelper('helper', function(options) {
          return options.fn.run;
-        }
-      };
-      var decorators = {
-        decorator: function(fn, props, container, options) {
+        })
+        .withDecorator('decorator', function(fn, props, container, options) {
          fn.run = (fn.run || '') + options.fn();
          return fn;
-        }
-      };
-      shouldCompileTo(
-          '{{#helper}}{{#*decorator}}suc{{/decorator}}{{#*decorator}}cess{{/decorator}}{{/helper}}',
-          {hash: {}, helpers: helpers, decorators: decorators},
-          'success');
+        })
+        .toCompileTo('success');
    });

    it('should access parent variables', function() {
-      var helpers = {
-        helper: function(options) {
+      expectTemplate('{{#helper}}{{*decorator foo}}{{/helper}}')
+        .withHelper('helper', function(options) {
          return options.fn.run;
-        }
-      };
-      var decorators = {
-        decorator: function(fn, props, container, options) {
+        })
+        .withDecorator('decorator', function(fn, props, container, options) {
          fn.run = options.args;
          return fn;
-        }
-      };
-      shouldCompileTo(
-          '{{#helper}}{{*decorator foo}}{{/helper}}',
-          {hash: {'foo': 'success'}, helpers: helpers, decorators: decorators},
-          'success');
+        })
+        .withInput({ foo: 'success' })
+        .toCompileTo('success');
    });
+
    it('should work with root program', function() {
      var run;
-      var decorators = {
-        decorator: function(fn, props, container, options) {
+      expectTemplate('{{*decorator "success"}}')
+        .withDecorator('decorator', function(fn, props, container, options) {
          equals(options.args[0], 'success');
          run = true;
          return fn;
-        }
-      };
-      shouldCompileTo(
-          '{{*decorator "success"}}',
-          {hash: {'foo': 'success'}, decorators: decorators},
-          '');
+        })
+        .withInput({ foo: 'success' })
+        .toCompileTo('');
      equals(run, true);
    });
+
    it('should fail when accessing variables from root', function() {
      var run;
-      var decorators = {
-        decorator: function(fn, props, container, options) {
+      expectTemplate('{{*decorator foo}}')
+        .withDecorator('decorator', function(fn, props, container, options) {
          equals(options.args[0], undefined);
          run = true;
          return fn;
-        }
-      };
-      shouldCompileTo(
-          '{{*decorator foo}}',
-          {hash: {'foo': 'fail'}, decorators: decorators},
-          '');
+        })
+        .withInput({ foo: 'fail' })
+        .toCompileTo('');
      equals(run, true);
    });

@@ -334,13 +431,25 @@ describe('blocks', function() {
        equals(handlebarsEnv.decorators.foo, undefined);
        equals(handlebarsEnv.decorators.bar, undefined);
      });
+
      it('fails with multiple and args', function() {
-        shouldThrow(function() {
-          handlebarsEnv.registerDecorator({
-            world: function() { return 'world!'; },
-            testHelper: function() { return 'found it!'; }
-          }, {});
-        }, Error, 'Arg not supported with multiple decorators');
+        shouldThrow(
+          function() {
+            handlebarsEnv.registerDecorator(
+              {
+                world: function() {
+                  return 'world!';
+                },
+                testHelper: function() {
+                  return 'found it!';
+                }
+              },
+              {}
+            );
+          },
+          Error,
+          'Arg not supported with multiple decorators'
+        );
      });
    });
  });
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Nils Knappmeier	b7aa22efc3	wip: only run "require"-test, if "require-extensions" exists "require" does not mean "amd" in this case...	2020-06-02 00:11:10 +02:00
Nils Knappmeier	416d8d810a	wip	2020-06-02 00:10:37 +02:00
Nils Knappmeier	6b1a4070c2	wip	2020-06-01 22:28:13 +02:00
Nils Knappmeier	55f65eaa2e	backup	2020-05-31 23:38:23 +02:00
John Boehr	77825f8d35	refator: In spec tests, use expectTemplate over equals and shouldThrow (#1683 )	2020-05-05 00:04:33 +02:00
Hannah Wolfe	3789a30955	chore: start testing on Node.js 12 and 13 - make sure we're aware of all compatibility issues	2020-04-03 20:05:19 +01:00
Hannah Wolfe	e6ad93ea01	v4.7.6	2020-04-03 18:56:22 +01:00
Hannah Wolfe	2bf4fc6fd3	Update release notes	2020-04-03 18:55:39 +01:00
Hannah Wolfe	b64202bc91	Update release-notes.md - indicate changes have been reverted	2020-04-03 18:47:56 +01:00
Douglas Christopher Wilson	c2f1e62031	Switch cmd parser to latest minimist	2020-04-03 18:44:30 +01:00
Hannah Wolfe	08e9a11a34	Revert "chore: set Node.js compatibility to v6+" This reverts commit `309d2b49a1`.	2020-04-03 18:44:30 +01:00
Hannah Wolfe	1fd2edee2a	v4.7.5	2020-04-02 20:09:49 +01:00
Hannah Wolfe	3c9c2f5cf2	Update release notes	2020-04-02 20:09:16 +01:00
Hannah Wolfe	16487a088e	chore: downgrade yargs to v14 - allows us to support Node v6 and v8 for now	2020-04-02 19:28:36 +01:00
Hannah Wolfe	309d2b49a1	chore: set Node.js compatibility to v6+ - drop support for versions less than Node v6 via engines - update integration tests to also test newer versions	2020-04-02 19:28:35 +01:00
Nils Knappmeier	645ac73844	test: fix integration tests - They should fail, if any test fails - Use "set -e" instead of "\|\| exit 1", because it suffices to be specified at the top of each file	2020-04-02 19:25:37 +01:00
Nils Knappmeier	b454b02147	docs: update release-docs in CONTRIBUTING.md - remove ember testing - add docs for updating the website. - add list of required accesses to publish	2020-04-02 14:10:47 +02:00
Hannah Wolfe	7adc19ab40	v4.7.4	2020-04-01 18:20:30 +01:00
Hannah Wolfe	9dd8d10e12	Update release notes	2020-04-01 18:19:34 +01:00
Hannah Wolfe	4671c4b383	Use tmp directory for files written during tests - Add spec/tmp directory with .gitkeep file to indicate the folder is intentional - Add the folder contents to .gitignore - Use this folder to output the sourcemap file during bin tests. This file is a sideeffect of the main test	2020-04-01 18:04:14 +01:00
DeeDeeG	e46baa1fe2	tasks/test-bin.js: Delete duplicate test Per comment by @ErisDS on the GitHub PR: https://github.com/wycats/handlebars.js/pull/1666#issuecomment-606805248	2020-04-01 17:25:35 +01:00
Hannah Wolfe	c491b4ea25	Revert "Update release-notes.md" This reverts commit `738391a064`. Think this needs to be left to the release tool :\|	2020-04-01 17:21:20 +01:00
Hannah Wolfe	738391a064	Update release-notes.md	2020-03-31 17:05:33 +01:00
Aori Nevo	80c4516fda	chore: add unit tests for cli options (#1666 ) - adds full unit tests for all cli options - demonstrates that nothing changes between minimist and yargs except a minor order change in the --help text - proves b9c4b253e works the same as before Co-authored-by: fabb <fabb@users.noreply.github.com>	2020-03-31 16:54:11 +01:00
Avi Vahl	d79212a662	fix: migrate from optimist to yargs (#1666 ) closes #1658 - adapted code from master to latest yargs (`.option` calls). ``` 4.x: found 188 vulnerabilities (169 low, 4 moderate, 14 high, 1 critical) in 5815 scanned packages 4.x with this PR: found 32 vulnerabilities (17 low, 1 moderate, 13 high, 1 critical) in 5829 scanned packages ```	2020-03-31 16:54:11 +01:00
Avi Vahl	b440c38886	chore: ignore external @types in tests - some indirect dependencies install @types packages which are not compatible with the older typescript. - adjusted test's tsconfig to not pick these up automatically, as the actual .d.ts does not depend on these external types.	2020-03-31 16:53:54 +01:00
Eli Skeggs	2dba7eee3f	docs: fix comparison link	2020-03-05 15:10:10 +01:00
Nils Knappmeier	c9789691af	v4.7.3	2020-02-05 06:10:33 +01:00
Nils Knappmeier	9278f217e0	Update release notes	2020-02-05 06:10:09 +01:00
roydukkey	d78cc73d3c	Fixes spelling and punctuation (cherry picked from commit `fd3ca85d13`)	2020-02-05 06:06:42 +01:00
ismailjones	4de51fe26b	Add Type Definition for Handlebars.VERSION, Fixes #1647	2020-02-04 23:32:10 +01:00
papasmile	a32d05f2fc	Include Type Definition for runtime.js in Package	2020-02-04 21:58:49 +01:00
Nils Knappmeier	ad63f5189f	chore: add missing "await" in aws-s3 publishing code closes #1644	2020-01-21 21:52:23 +01:00
Nils Knappmeier	586e672c8b	v4.7.2	2020-01-13 21:53:14 +01:00
Nils Knappmeier	f0c6c4cc1f	Update release notes	2020-01-13 21:52:50 +01:00
Nils Knappmeier	a4fd391ba1	chore: execute saucelabs-task only if access-key exists - up to now, the existance of the SAUCE_USERNAME was checked but this variable is even present in pull-requests from other repos. This means that builds fail, because the access key is not there. This change looks for SAUCE_ACCESS_KEY instead, which is a secure variable, only present in build originating from the handlebars.js repo.	2020-01-13 21:47:51 +01:00
Nils Knappmeier	9d5aa363cf	fix: don't wrap helpers that are not functions - helpers should always be a function, but in #1639 one seems to be undefined. This was not a problem before 4.6 because helpers weren't wrapped then. Now, we must take care only to wrap helpers (when adding the "lookupProperty" function to the options), if they are really functions.	2020-01-13 21:39:01 +01:00
Nils Knappmeier	14ba3d0c43	v4.7.1	2020-01-12 13:21:08 +01:00
Nils Knappmeier	4cddfe7017	Update release notes	2020-01-12 13:20:37 +01:00
Nils Knappmeier	f152dfc892	fix: fix log output in case of illegal property access - fix link url to handlebarsjs.com	2020-01-12 13:09:19 +01:00
Nils Knappmeier	3c1e252169	fix: log error for illegal property access only once per property	2020-01-12 13:06:56 +01:00
Nils Knappmeier	0d5c807017	v4.7.0	2020-01-10 17:24:06 +01:00
Nils Knappmeier	1f0834b1a2	Update release notes	2020-01-10 17:23:31 +01:00
Nils Knappmeier	575d8772e2	fix: use "logger" instead of console.error ... to be graceful with older browser without "console"	2020-01-10 17:06:57 +01:00
Nils Knappmeier	7af1c12db6	feat: default options for controlling proto access This commmit adds the runtime options - `allowProtoPropertiesByDefault` (boolean, default: false) and - `allowProtoMethodsByDefault` (boolean, default: false)` which can be used to allow access to prototype properties and functions in general. Specific properties and methods can still be disabled from access via `allowedProtoProperties` and `allowedProtoMethods` by setting the corresponding values to false. The methods `constructor`, `__defineGetter__`, `__defineSetter__`, `__lookupGetter__` and the property `__proto__` will be disabled, even if the allow...ByDefault-options are set to true. In order to allow access to those properties and methods, they have to be explicitly set to true in the 'allowedProto...'-options. A warning is logged when the a proto-access it attempted and denied by default (i.e. if no option is set by the user to make the access decision explicit)	2020-01-10 16:55:45 +01:00
Nils Knappmeier	91a1b5d2f4	v4.6.0	2020-01-08 23:45:15 +01:00
Nils Knappmeier	770d746e60	Update release notes	2020-01-08 23:44:46 +01:00
Nils Knappmeier	d7f0dcf2bb	refactor: fix typo in private test method	2020-01-08 23:17:23 +01:00
Nils Knappmeier	187d611e8c	test: add path to nodeJs when running test:bin - this allows the test to be run in a debugger without the complete PATH	2020-01-08 23:17:23 +01:00
Nils Knappmeier	d337f40d0e	test: show diff when test:bin fails	2020-01-08 23:17:23 +01:00
Nils Knappmeier	d03b6ecfc4	feat: access control to prototype properties via whitelist Disallow access to prototype properties and methods by default. Access to properties is always checked via `Object.prototype.hasOwnProperty.call(parent, propertyName)`. New runtime options: - allowedProtoMethods: a string-to-boolean map of property-names that are allowed if they are methods of the parent object. - allowedProtoProperties: a string-to-boolean map of property-names that are allowed if they are properties but not methods of the parent object. ```js const template = handlebars.compile('{{aString.trim}}') const result = template({ aString: ' abc ' }) // result is empty, because trim is defined at String prototype ``` ```js const template = handlebars.compile('{{aString.trim}}') const result = template({ aString: ' abc ' }, { allowedProtoMethods: { trim: true } }) // result = 'abc' ``` Implementation details: The method now "container.lookupProperty" handles the prototype-checks and the white-lists. It is used in - JavaScriptCompiler#nameLookup - The "lookup"-helper (passed to all helpers as "options.lookupProperty") - The "lookup" function at the container, which is used for recursive lookups in "compat" mode Compatibility: - Old precompiled templates work with new runtimes: The "options.lookupPropery"-function is passed to the helper by a wrapper, not by the compiled templated. - New templates work with old runtimes: The template contains a function that is used as fallback if the "lookupProperty"-function cannot be found at the container. However, the runtime-options "allowedProtoProperties" and "allowedProtoMethods" only work with the newest runtime. BREAKING CHANGE: - access to prototype properties is forbidden completely by default	2020-01-08 23:17:23 +01:00
Nils Knappmeier	164b7ff0de	chore: ignore .nyc_output	2019-12-14 18:41:06 +01:00
Nils Knappmeier	ac4655ee95	chore: disable "dot-notation" rule - I don't think it makes much sense. In some cases, it is more readable to wrap property access in quotes, some times not, but there is no universal rule for that. - a promises "catch"-function should not be wrapped, but it has to be, if "allow-keywords" is set to false - an "if"-helper should be wrapped, but it is not allowed to be if "allow-keywords" is set to true (default).	2019-12-14 18:41:06 +01:00
Nils Knappmeier	14b621caf5	test/style: remove or hide unused code in git.js, add tests	2019-12-14 18:41:06 +01:00
Nils Knappmeier	1ec1737d24	test/style: refactor remaining grunt tasks to use promises instead of callbacks	2019-12-14 18:41:06 +01:00
Nils Knappmeier	1ebce2b53c	test/style: use nyc instead of istanbul, npm audit fix	2019-12-14 18:41:06 +01:00
Nils Knappmeier	3a5b65e02b	test/style: refactor parser task	2019-12-14 18:41:06 +01:00
Nils Knappmeier	dde108e283	test/style: refactor test-task to make it more readable	2019-12-14 18:41:06 +01:00
Nils Knappmeier	dc5495216d	chore: change eslint-rules for tasks/ - use es2017 rules as NodeJS supports it today - add "prefer-const"	2019-12-14 18:41:06 +01:00
Marcos Marado	d1fb07b32b	Update (C) year in the LICENSE file Welcome to 2019!	2019-12-08 16:21:38 +01:00
Nils Knappmeier	04b19848cc	chore: try to fix saucelabs credentials (#1627 )	2019-12-08 16:17:15 +01:00
Nils Knappmeier	c40d9f33ad	chore: active linting and formatting on commit	2019-12-05 08:01:33 +01:00
Nils Knappmeier	8901c28e9a	chore: fix task name in build	2019-12-03 22:59:04 +01:00
Nils Knappmeier	e97685e989	style: reformat all files using prettier	2019-12-03 22:37:15 +01:00
Nils Knappmeier	e913dc5f12	chore: restructure build commands - move dtslint (checkTypes) away from Gruntfile.js (as it disturbs debugging `grunt`) and call it directly as npm-script in travis-ci - re-group task definition in Gruntfile.js - use a multi-job travis build to run linting, format, dtslint and tests in parallel - run only "npm test" on appveyor - rename Grunt-tasks for be more descriptive - SAUCE_USERNAME is not a secret variable anymore it can be easily guessed anyway and the [secure] value messes up with a lot of the log output - linting on commit disable during transition	2019-12-03 22:21:30 +01:00
Nils Knappmeier	1f61f21250	chore: configure prettier and eslint - add prettier to do formatting - add eslint-config-prettier to disable rules conflicting with prettier - remove eslint from grunt workflow - use lint-stage to lint and format on precommit - use eslint and prettier in travis directly - remove rules that are already part of the "recommended" ruleset That rational is that eslint and prettier should be run in Travis-CI, on commit and as IDE integration (highlighting errors directlry). They don't need to be run along with test-cases. Getting linting errors when running the tests because of missing semicolons is just annoying, but doesn't help the overall code-quality.	2019-12-02 22:40:05 +01:00
Nils Knappmeier	587e7a3e63	remove yarn.lock	2019-12-02 22:40:04 +01:00
ole-martin	edcc84f292	Update readme.md with updated links (#1620 ) * Update readme.md with updated links Fix http->https where possible and update links doc links * Update README.markdown * Fix precompilation link	2019-12-02 22:03:52 +01:00
ole-martin	23d58e79bb	fix(runtime.js): partials compile not caching (#1600 ) Reintroduce "merge" function, no called "mergeIfNeeded", that only creates a new partials object if both "env.partials" and "options.partials" are set. closes #1598	2019-11-18 21:21:03 +01:00
Nils Knappmeier	c819c8b533	v4.5.3	2019-11-18 08:10:26 +01:00
Nils Knappmeier	827c9d0747	Update release notes	2019-11-18 08:09:48 +01:00
Nils Knappmeier	f7f05d7558	fix: add "no-prototype-builtins" eslint-rule and fix all occurences	2019-11-18 07:33:45 +01:00
Nils Knappmeier	1988878087	fix: add more properties required to be enumerable - __defineGetter__, __defineSetter__, __lookupGetter__, __proto__	2019-11-18 07:33:45 +01:00
Nils Knappmeier	886ba86c2f	test/chore: add chai/expect and sinon to "runtime"-environment	2019-11-17 22:18:20 +01:00
Nils Knappmeier	0817dad7e7	test: add sinon as global variable to eslint in the specs	2019-11-15 17:22:29 +01:00
Nils Knappmeier	93516a0b07	test: add sinon.js for spies, deprecate current assertions - the goal is to get overall cleaner test. - chai and sinon are standard libraries for testing assertions and spies. We should not use custom ones.	2019-11-15 16:38:28 +01:00
Nils Knappmeier	93e284ed9b	chore: add chai and dirty-chai for better test assertions	2019-11-15 16:38:28 +01:00
Nils Knappmeier	c02b05fa81	fix: use !== 0 instead of != 0	2019-11-15 16:38:28 +01:00
Nils Knappmeier	8de121d21c	v4.5.2	2019-11-13 22:07:27 +01:00
Nils Knappmeier	6914090086	Update release notes	2019-11-13 22:06:51 +01:00
Nils Knappmeier	d54137810a	fix: use String(field) in lookup when checking for "constructor" closes #1603	2019-11-13 22:02:05 +01:00
Nils Knappmeier	c2ac79c970	test: add fluent API for testing Handlebars use "expectTemplate(template)....toCompileTo(output)"	2019-11-13 22:02:05 +01:00