Merge branch '4.x' into merge-4.x

tests/integration/multi-nodejs-test/.eslintrc.js

@@ -0,0 +1,13 @@
+module.exports = {
+  extends: ['eslint:recommended', 'plugin:es5/no-es2015', 'prettier'],
+  globals: {
+    self: false
+  },
+  env: {
+    node: true
+  },
+  rules: {
+    'no-console': 'off',
+    'no-var': 'off'
+  }
+};

tests/integration/multi-nodejs-test/.gitignore

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+target
+package-lock.json

tests/integration/multi-nodejs-test/package.json

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+{
+  "name": "multi-nodejs-test",
+  "version": "1.0.0",
+  "description": "Simple integration test with all relevant NodeJS-versions.",
+  "keywords": [],
+  "author": "Nils Knappmeier",
+  "private": true,
+  "license": "MIT",
+  "dependencies": {
+    "handlebars": "file:../../.."
+  },
+  "scripts": {
+    "test": "node run-handlebars.js",
+    "test-precompile": "handlebars precompile-test-template.txt.hbs"
+  }
+}

tests/integration/multi-nodejs-test/precompile-test-template.txt.hbs

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+Author: {{author}}

tests/integration/multi-nodejs-test/run-handlebars.js

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+// This test should run successfully with node 0.10++ as long as Handlebars has been compiled before
+var assert = require('assert');
+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' });
+assert.strictEqual(output, 'Author: Yehuda');
+
+console.log('Success');

tests/integration/multi-nodejs-test/test.sh

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+#!/bin/bash
+
+set -e
+
+cd "$( dirname "$( readlink -f "$0" )" )" || exit 1
+# shellcheck disable=SC1090
+[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
+
+# This script tests with precompiler and the built distribution with multiple NodeJS version.
+# This test is simple by design. It merely ensures, that calling Handlebars does not fail with old versions.
+# It does (almost) not test for correctness, because that is already done in the mocha-tests.
+# And it does not use any NodeJS based testing framework to make this part independent of the Node version.
+
+unset npm_config_prefix
+
+echo "Handlebars should be able to run in various versions of NodeJS"
+for node_version_to_test in 10 11 12 13 14 15 16 17; do
+
+    rm target node_modules package-lock.json -rf
+    mkdir target
+
+    nvm install "$node_version_to_test"
+    nvm exec "$node_version_to_test" npm install
+    nvm exec "$node_version_to_test" npm run test
+    nvm exec "$node_version_to_test" npm run test-precompile
+
+    echo Success
+done