Simplifies creation of HTML files to serve your webpack bundles. 

Simplifies creation of HTML files to serve your webpack bundles

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

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

/** @typedef {import("webpack/lib/Chunk.js")} WebpackChunk */

 * This file uses webpack to compile a template with a child compiler.

const NodeTemplatePlugin = require('webpack/lib/node/NodeTemplatePlugin');

const NodeTargetPlugin = require('webpack/lib/node/NodeTargetPlugin');

const LoaderTargetPlugin = require('webpack/lib/LoaderTargetPlugin');

const SingleEntryPlugin = require('webpack/lib/SingleEntryPlugin');

 * The HtmlWebpackChildCompiler is a helper to allow reusing one childCompiler

 * for multiple HtmlWebpackPlugin instances to improve the compilation performance.

     * The template array will allow us to keep track which input generated which output

     * @type {Promise<{[templatePath: string]: { content: string, hash: string, entry: WebpackChunk }}>}

    this.compilationPromise; // eslint-disable-line

    this.compilationStartedTimestamp; // eslint-disable-line

    this.compilationEndedTimestamp; // eslint-disable-line

     * All file dependencies of the child compiler

     * @type {{fileDependencies: string[], contextDependencies: string[], missingDependencies: string[]}}

    this.fileDependencies = { fileDependencies: [], contextDependencies: [], missingDependencies: [] };

   * Returns true if the childCompiler is currently compiling

    return !this.didCompile() && this.compilationStartedTimestamp !== undefined;

   * Returns true if the childCompiler is done compiling

    return this.compilationEndedTimestamp !== undefined;

   * This function will start the template compilation

   * once it is started no more templates can be added

   * @param {import('Webpack').Compilation} mainCompilation

   * @returns {Promise<{[templatePath: string]: { content: string, hash: string, entry: WebpackChunk }}>}

    const webpack = mainCompilation.compiler.webpack;

    const Compilation = webpack.Compilation;

    const NodeTemplatePlugin = webpack.node.NodeTemplatePlugin;

    const NodeTargetPlugin = webpack.node.NodeTargetPlugin;

    const LoaderTargetPlugin = webpack.LoaderTargetPlugin;

    const SingleEntryPlugin = webpack.SingleEntryPlugin;

    // To prevent multiple compilations for the same template

    // the compilation is cached in a promise.

      publicPath: mainCompilation.outputOptions.publicPath,

        name: 'HTML_WEBPACK_PLUGIN_RESULT'

      scriptType: (/** @type {'text/javascript'} */'text/javascript'),

    const compilerName = 'HtmlWebpackCompiler';

    // Create an additional child compiler which takes the template

    // and turns it into an Node.JS html factory.

    // This allows us to use loaders during the compilation

    const childCompiler = mainCompilation.createChildCompiler(compilerName, outputOptions, [

      // Compile the template to nodejs javascript

      new NodeTemplatePlugin(outputOptions),

    // The file path context which webpack uses to resolve all relative files to

    childCompiler.context = mainCompilation.compiler.context;

    const temporaryTemplateNames = this.templates.map((template, index) => `__child-HtmlWebpackPlugin_${index}-${this.id}`);

    this.templates.forEach((template, index) => {

      new SingleEntryPlugin(childCompiler.context, template, `HtmlWebpackPlugin_${index}-${this.id}`).apply(childCompiler);

    this.compilationStartedTimestamp = new Date().getTime();

    this.compilationPromise = new Promise((resolve, reject) => {

      childCompiler.hooks.thisCompilation.tap('HtmlWebpackPlugin', (compilation) => {

        compilation.hooks.processAssets.tap(

            stage: Compilation.PROCESS_ASSETS_STAGE_ADDITIONS

            temporaryTemplateNames.forEach((temporaryTemplateName) => {

              if (assets[temporaryTemplateName]) {

                extractedAssets.push(assets[temporaryTemplateName]);

                compilation.deleteAsset(temporaryTemplateName);

      childCompiler.runAsChild((err, entries, childCompilation) => {

        const compiledTemplates = entries

          ? extractedAssets.map((asset) => asset.source())

        if (entries && childCompilation) {

          this.fileDependencies = { fileDependencies: Array.from(childCompilation.fileDependencies), contextDependencies: Array.from(childCompilation.contextDependencies), missingDependencies: Array.from(childCompilation.missingDependencies) };

        // Reject the promise if the childCompilation contains error

        if (childCompilation && childCompilation.errors && childCompilation.errors.length) {

          const errorDetails = childCompilation.errors.map(error => {

              message += ':\n' + error.error;

              message += '\n' + error.stack;

          reject(new Error('Child compilation failed:\n' + errorDetails));

        // Reject if the error object contains errors

        if (!childCompilation || !entries) {

          reject(new Error('Empty child compilation'));

         * @type {{[templatePath: string]: { content: string, hash: string, entry: WebpackChunk }}}

        compiledTemplates.forEach((templateSource, entryIndex) => {

          // The compiledTemplates are generated from the entries added in

          // Therefore the array index of this.templates should be the as entryIndex.

          result[this.templates[entryIndex]] = {

  "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"

		{
		"name": "html-webpack-plugin",
		"version": "5.0.0-alpha.8",
		"version": "5.0.0-alpha.9",
		"license": "MIT",
		@@ -5,0 +5,0 @@ "description": "Simplifies creation of HTML files to serve your webpack bundles",

		@@ -14,6 +14,2 @@ // @ts-check
		'use strict';
		const NodeTemplatePlugin = require('webpack/lib/node/NodeTemplatePlugin');
		const NodeTargetPlugin = require('webpack/lib/node/NodeTargetPlugin');
		const LoaderTargetPlugin = require('webpack/lib/LoaderTargetPlugin');
		const SingleEntryPlugin = require('webpack/lib/SingleEntryPlugin');

		@@ -83,2 +79,7 @@ let instanceId = 0;

		const NodeTemplatePlugin = webpack.node.NodeTemplatePlugin;
		const NodeTargetPlugin = webpack.node.NodeTargetPlugin;
		const LoaderTargetPlugin = webpack.LoaderTargetPlugin;
		const SingleEntryPlugin = webpack.SingleEntryPlugin;

		// To prevent multiple compilations for the same template
		@@ -85,0 +86,0 @@ // the compilation is cached in a promise.

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