Simplifies creation of HTML files to serve your webpack bundles. 

Simplifies creation of HTML files to serve your webpack bundles

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html-webpack-plugin

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/** @typedef {import("./typings").HtmlTagObject} HtmlTagObject */

/** @typedef {import("./typings").Options} HtmlWebpackOptions */

/** @typedef {import("./typings").ProcessedOptions} ProcessedHtmlWebpackOptions */

/** @typedef {import("./typings").TemplateParameter} TemplateParameter */

/** @typedef {import("webpack/lib/Compiler.js")} WebpackCompiler */

/** @typedef {import("webpack/lib/Compilation.js")} WebpackCompilation */

const promisify = require('util').promisify;

const loaderUtils = require('loader-utils');

const { CachedChildCompilation } = require('./lib/cached-child-compiler');

const { createHtmlTagObject, htmlTagObjectToString, HtmlTagArray } = require('./lib/html-tags');

const prettyError = require('./lib/errors.js');

const chunkSorter = require('./lib/chunksorter.js');

const getHtmlWebpackPluginHooks = require('./lib/hooks.js').getHtmlWebpackPluginHooks;

const fsReadFileAsync = promisify(fs.readFile);

   * @param {HtmlWebpackOptions} [options]

    this.version = HtmlWebpackPlugin.version;

    // Wait for configuration preset plugions to apply all configure webpack defaults

    compiler.hooks.initialize.tap('HtmlWebpackPlugin', () => {

      const userOptions = this.userOptions;

      /** @type {ProcessedHtmlWebpackOptions} */

        templateParameters: templateParametersGenerator,

        publicPath: userOptions.publicPath === undefined ? 'auto' : userOptions.publicPath,

        inject: userOptions.scriptLoading === 'blocking' ? 'body' : 'head',

      const options = Object.assign(defaultOptions, userOptions);

      // Default metaOptions if no template is provided

      if (!userOptions.template && options.templateContent === false && options.meta) {

        // From https://developer.mozilla.org/en-US/docs/Mozilla/Mobile/Viewport_meta_tag

          viewport: 'width=device-width, initial-scale=1'

        options.meta = Object.assign({}, options.meta, defaultMeta, userOptions.meta);

      // Get all filenNames to support [name]

      const multipleOptions = options.filename.includes('[name]')

        ? Object.keys(compiler.options.entry).map((entryName) => ({

          filename: options.filename.replace(/\[name\]/g, entryName)

      // Hook all options into the webpack compiler

      multipleOptions.forEach((instanceOptions) => {

        hookIntoCompiler(compiler, instanceOptions, this);

   * Once webpack is done with compiling the template into a NodeJS code this function

   * evaluates it to generate the html result

   * The evaluateCompilationResult is only a class function to allow spying during testing.

   * Please change that in a further refactoring

   * @returns {Promise<string | (() => string | Promise<string>)>}

  evaluateCompilationResult (source, templateFilename) {

      return Promise.reject(new Error('The child compilation didn\'t provide a result'));

    // The LibraryTemplatePlugin stores the template result in a local variable.

    // To extract the result during the evaluation this part has to be removed.

    source = source.replace('var HTML_WEBPACK_PLUGIN_RESULT =', '');

    const templateWithoutLoaders = templateFilename.replace(/^.+!/, '').replace(/\?.+$/, '');

    const vmContext = vm.createContext({ HTML_WEBPACK_PLUGIN: true, require: require, ...global });

    const vmScript = new vm.Script(source, { filename: templateWithoutLoaders });

      newSource = vmScript.runInContext(vmContext);

    if (typeof newSource === 'object' && newSource.__esModule && newSource.default) {

    return typeof newSource === 'string' || typeof newSource === 'function'

      : Promise.reject(new Error('The loader "' + templateWithoutLoaders + '" didn\'t return html.'));

 * apply is called by the webpack main compiler during the start phase

 * @param {ProcessedHtmlWebpackOptions} options

function hookIntoCompiler (compiler, options, plugin) {

  // Instance variables to keep caching information

  options.template = getFullTemplatePath(options.template, compiler.context);

  const childCompilerPlugin = new CachedChildCompilation(compiler);

    childCompilerPlugin.addEntry(options.template);

  // convert absolute filename into relative so that webpack can

  if (path.resolve(filename) === path.normalize(filename)) {

    options.filename = path.relative(compiler.options.output.path, filename);

  // `contenthash` is introduced in webpack v4.3

  // which conflicts with the plugin's existing `contenthash` method,

  // hence it is renamed to `templatehash` to avoid conflicts

  options.filename = options.filename.replace(/\[(?:(\w+):)?contenthash(?::([a-z]+\d*))?(?::(\d+))?\]/ig, (match) => {

    return match.replace('contenthash', 'templatehash');

  // Check if webpack is running in production mode

  // @see https://github.com/webpack/webpack/blob/3366421f1784c449f415cda5930a8e445086f688/lib/WebpackOptionsDefaulter.js#L12-L14

  const isProductionLikeMode = compiler.options.mode === 'production' || !compiler.options.mode;

  if (minify === true || (minify === 'auto' && isProductionLikeMode)) {

  "description": "Simplifies creation of HTML files to serve your webpack bundles",

  "author": "Jan Nicklas <j.nicklas@me.com> (https://github.com/jantimon)",

    "build-examples": "node examples/build-examples.js",

    "test": "jest --runInBand --verbose --coverage",

    "test-watch": "jest --runInBand --watch",

    "puml": "npx puml generate flow.puml -o flow.png",

    "cz-conventional-changelog": "2.1.0",

    "webpack-recompilation-simulator": "3.2.0"

    "@types/html-minifier-terser": "^5.0.0",

  "bugs": "https://github.com/jantimon/html-webpack-plugin/issues",

  "homepage": "https://github.com/jantimon/html-webpack-plugin",

  "repository": "https://github.com/jantimon/html-webpack-plugin.git",

      "path": "./node_modules/cz-conventional-changelog"

    "url": "https://opencollective.com/html-webpack-plugin"

		@@ -72,2 +72,3 @@ // @ts-check
		const options = Object.assign(defaultOptions, userOptions);
		this.options = options;

		@@ -74,0 +75,0 @@ // Default metaOptions if no template is provided

		{
		"name": "html-webpack-plugin",
		"version": "5.0.0-alpha.4",
		"version": "5.0.0-alpha.5",
		"license": "MIT",
		@@ -5,0 +5,0 @@ "description": "Simplifies creation of HTML files to serve your webpack bundles",

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