'use strict';
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// use Polyfill for util.promisify in node versions < v8
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const promisify = require('util.promisify');
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const vm = require('vm');
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const fs = require('fs');
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const _ = require('lodash');
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const path = require('path');
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const childCompiler = require('./lib/compiler.js');
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const prettyError = require('./lib/errors.js');
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const chunkSorter = require('./lib/chunksorter.js');
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const fsStatAsync = promisify(fs.stat);
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const fsReadFileAsync = promisify(fs.readFile);
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class HtmlWebpackPlugin {
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constructor (options) {
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// Default options
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this.options = _.extend({
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template: path.join(__dirname, 'default_index.ejs'),
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templateParameters: templateParametersGenerator,
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filename: 'index.html',
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hash: false,
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inject: true,
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compile: true,
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favicon: false,
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minify: false,
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cache: true,
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showErrors: true,
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chunks: 'all',
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excludeChunks: [],
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chunksSortMode: 'auto',
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meta: {},
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title: 'Webpack App',
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xhtml: false
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}, options);
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}
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apply (compiler) {
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const self = this;
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let isCompilationCached = false;
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let compilationPromise;
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this.options.template = this.getFullTemplatePath(this.options.template, compiler.context);
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// convert absolute filename into relative so that webpack can
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// generate it at correct location
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const filename = this.options.filename;
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if (path.resolve(filename) === path.normalize(filename)) {
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this.options.filename = path.relative(compiler.options.output.path, filename);
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}
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// setup hooks for webpack 4
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if (compiler.hooks) {
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compiler.hooks.compilation.tap('HtmlWebpackPluginHooks', compilation => {
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const SyncWaterfallHook = require('tapable').SyncWaterfallHook;
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const AsyncSeriesWaterfallHook = require('tapable').AsyncSeriesWaterfallHook;
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compilation.hooks.htmlWebpackPluginAlterChunks = new SyncWaterfallHook(['chunks', 'objectWithPluginRef']);
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compilation.hooks.htmlWebpackPluginBeforeHtmlGeneration = new AsyncSeriesWaterfallHook(['pluginArgs']);
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compilation.hooks.htmlWebpackPluginBeforeHtmlProcessing = new AsyncSeriesWaterfallHook(['pluginArgs']);
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compilation.hooks.htmlWebpackPluginAlterAssetTags = new AsyncSeriesWaterfallHook(['pluginArgs']);
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compilation.hooks.htmlWebpackPluginAfterHtmlProcessing = new AsyncSeriesWaterfallHook(['pluginArgs']);
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compilation.hooks.htmlWebpackPluginAfterEmit = new AsyncSeriesWaterfallHook(['pluginArgs']);
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});
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}
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// Backwards compatible version of: compiler.hooks.make.tapAsync()
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(compiler.hooks ? compiler.hooks.make.tapAsync.bind(compiler.hooks.make, 'HtmlWebpackPlugin') : compiler.plugin.bind(compiler, 'make'))((compilation, callback) => {
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// Compile the template (queued)
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compilationPromise = childCompiler.compileTemplate(self.options.template, compiler.context, self.options.filename, compilation)
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.catch(err => {
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compilation.errors.push(prettyError(err, compiler.context).toString());
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return {
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content: self.options.showErrors ? prettyError(err, compiler.context).toJsonHtml() : 'ERROR',
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outputName: self.options.filename
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};
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})
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.then(compilationResult => {
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// If the compilation change didnt change the cache is valid
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isCompilationCached = compilationResult.hash && self.childCompilerHash === compilationResult.hash;
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self.childCompilerHash = compilationResult.hash;
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self.childCompilationOutputName = compilationResult.outputName;
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callback();
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return compilationResult.content;
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});
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});
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// Backwards compatible version of: compiler.plugin.emit.tapAsync()
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(compiler.hooks ? compiler.hooks.emit.tapAsync.bind(compiler.hooks.emit, 'HtmlWebpackPlugin') : compiler.plugin.bind(compiler, 'emit'))((compilation, callback) => {
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const applyPluginsAsyncWaterfall = self.applyPluginsAsyncWaterfall(compilation);
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// Get chunks info as json
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// Note: we're excluding stuff that we don't need to improve toJson serialization speed.
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const chunkOnlyConfig = {
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assets: false,
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cached: false,
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children: false,
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chunks: true,
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chunkModules: false,
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chunkOrigins: false,
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errorDetails: false,
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hash: false,
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modules: false,
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reasons: false,
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source: false,
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timings: false,
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version: false
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};
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const allChunks = compilation.getStats().toJson(chunkOnlyConfig).chunks;
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// Filter chunks (options.chunks and options.excludeCHunks)
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let chunks = self.filterChunks(allChunks, self.options.chunks, self.options.excludeChunks);
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// Sort chunks
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chunks = self.sortChunks(chunks, self.options.chunksSortMode, compilation);
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// Let plugins alter the chunks and the chunk sorting
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if (compilation.hooks) {
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chunks = compilation.hooks.htmlWebpackPluginAlterChunks.call(chunks, { plugin: self });
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} else {
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// Before Webpack 4
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chunks = compilation.applyPluginsWaterfall('html-webpack-plugin-alter-chunks', chunks, { plugin: self });
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}
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// Get assets
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const assets = self.htmlWebpackPluginAssets(compilation, chunks);
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// If this is a hot update compilation, move on!
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// This solves a problem where an `index.html` file is generated for hot-update js files
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// It only happens in Webpack 2, where hot updates are emitted separately before the full bundle
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if (self.isHotUpdateCompilation(assets)) {
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return callback();
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}
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// If the template and the assets did not change we don't have to emit the html
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const assetJson = JSON.stringify(self.getAssetFiles(assets));
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if (isCompilationCached && self.options.cache && assetJson === self.assetJson) {
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return callback();
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} else {
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self.assetJson = assetJson;
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}
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Promise.resolve()
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// Favicon
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.then(() => {
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if (self.options.favicon) {
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return self.addFileToAssets(self.options.favicon, compilation)
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.then(faviconBasename => {
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let publicPath = compilation.mainTemplate.getPublicPath({hash: compilation.hash}) || '';
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if (publicPath && publicPath.substr(-1) !== '/') {
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publicPath += '/';
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}
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assets.favicon = publicPath + faviconBasename;
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});
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}
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})
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// Wait for the compilation to finish
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.then(() => compilationPromise)
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.then(compiledTemplate => {
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// Allow to use a custom function / string instead
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if (self.options.templateContent !== undefined) {
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return self.options.templateContent;
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}
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// Once everything is compiled evaluate the html factory
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// and replace it with its content
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return self.evaluateCompilationResult(compilation, compiledTemplate);
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})
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// Allow plugins to make changes to the assets before invoking the template
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// This only makes sense to use if `inject` is `false`
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.then(compilationResult => applyPluginsAsyncWaterfall('html-webpack-plugin-before-html-generation', false, {
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assets: assets,
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outputName: self.childCompilationOutputName,
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plugin: self
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})
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.then(() => compilationResult))
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// Execute the template
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.then(compilationResult => typeof compilationResult !== 'function'
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? compilationResult
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: self.executeTemplate(compilationResult, chunks, assets, compilation))
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// Allow plugins to change the html before assets are injected
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.then(html => {
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const pluginArgs = {html: html, assets: assets, plugin: self, outputName: self.childCompilationOutputName};
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return applyPluginsAsyncWaterfall('html-webpack-plugin-before-html-processing', true, pluginArgs);
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})
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.then(result => {
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const html = result.html;
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const assets = result.assets;
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// Prepare script and link tags
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const assetTags = self.generateHtmlTags(assets);
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const pluginArgs = {head: assetTags.head, body: assetTags.body, plugin: self, chunks: chunks, outputName: self.childCompilationOutputName};
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// Allow plugins to change the assetTag definitions
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return applyPluginsAsyncWaterfall('html-webpack-plugin-alter-asset-tags', true, pluginArgs)
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.then(result => self.postProcessHtml(html, assets, { body: result.body, head: result.head })
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.then(html => _.extend(result, {html: html, assets: assets})));
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})
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// Allow plugins to change the html after assets are injected
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.then(result => {
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const html = result.html;
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const assets = result.assets;
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const pluginArgs = {html: html, assets: assets, plugin: self, outputName: self.childCompilationOutputName};
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return applyPluginsAsyncWaterfall('html-webpack-plugin-after-html-processing', true, pluginArgs)
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.then(result => result.html);
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})
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.catch(err => {
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// In case anything went wrong the promise is resolved
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// with the error message and an error is logged
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compilation.errors.push(prettyError(err, compiler.context).toString());
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// Prevent caching
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self.hash = null;
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return self.options.showErrors ? prettyError(err, compiler.context).toHtml() : 'ERROR';
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})
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.then(html => {
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// Replace the compilation result with the evaluated html code
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compilation.assets[self.childCompilationOutputName] = {
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source: () => html,
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size: () => html.length
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};
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})
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.then(() => applyPluginsAsyncWaterfall('html-webpack-plugin-after-emit', false, {
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html: compilation.assets[self.childCompilationOutputName],
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outputName: self.childCompilationOutputName,
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plugin: self
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}).catch(err => {
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console.error(err);
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return null;
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}).then(() => null))
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// Let webpack continue with it
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.then(() => {
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callback();
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});
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});
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}
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/**
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* Evaluates the child compilation result
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* Returns a promise
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*/
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evaluateCompilationResult (compilation, source) {
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if (!source) {
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return Promise.reject('The child compilation didn\'t provide a result');
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}
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// The LibraryTemplatePlugin stores the template result in a local variable.
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// To extract the result during the evaluation this part has to be removed.
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source = source.replace('var HTML_WEBPACK_PLUGIN_RESULT =', '');
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const template = this.options.template.replace(/^.+!/, '').replace(/\?.+$/, '');
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const vmContext = vm.createContext(_.extend({HTML_WEBPACK_PLUGIN: true, require: require}, global));
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const vmScript = new vm.Script(source, {filename: template});
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// Evaluate code and cast to string
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let newSource;
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try {
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newSource = vmScript.runInContext(vmContext);
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} catch (e) {
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return Promise.reject(e);
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}
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if (typeof newSource === 'object' && newSource.__esModule && newSource.default) {
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newSource = newSource.default;
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}
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return typeof newSource === 'string' || typeof newSource === 'function'
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? Promise.resolve(newSource)
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: Promise.reject('The loader "' + this.options.template + '" didn\'t return html.');
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}
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/**
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* Generate the template parameters for the template function
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*/
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getTemplateParameters (compilation, assets) {
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if (typeof this.options.templateParameters === 'function') {
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return this.options.templateParameters(compilation, assets, this.options);
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}
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if (typeof this.options.templateParameters === 'object') {
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return this.options.templateParameters;
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}
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return {};
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}
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/**
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* Html post processing
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*
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* Returns a promise
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*/
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executeTemplate (templateFunction, chunks, assets, compilation) {
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return Promise.resolve()
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// Template processing
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.then(() => {
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const templateParams = this.getTemplateParameters(compilation, assets);
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let html = '';
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try {
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html = templateFunction(templateParams);
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} catch (e) {
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compilation.errors.push(new Error('Template execution failed: ' + e));
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return Promise.reject(e);
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}
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return html;
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});
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}
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/**
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* Html post processing
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*
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* Returns a promise
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*/
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postProcessHtml (html, assets, assetTags) {
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const self = this;
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if (typeof html !== 'string') {
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return Promise.reject('Expected html to be a string but got ' + JSON.stringify(html));
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}
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return Promise.resolve()
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// Inject
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.then(() => {
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if (self.options.inject) {
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return self.injectAssetsIntoHtml(html, assets, assetTags);
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} else {
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return html;
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}
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})
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// Minify
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.then(html => {
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if (self.options.minify) {
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const minify = require('html-minifier').minify;
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return minify(html, self.options.minify);
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}
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return html;
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});
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}
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/*
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* Pushes the content of the given filename to the compilation assets
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*/
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addFileToAssets (filename, compilation) {
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filename = path.resolve(compilation.compiler.context, filename);
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return Promise.all([
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fsStatAsync(filename),
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fsReadFileAsync(filename)
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])
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.then(([size, source]) => {
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return {
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size,
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source
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};
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})
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.catch(() => Promise.reject(new Error('HtmlWebpackPlugin: could not load file ' + filename)))
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.then(results => {
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const basename = path.basename(filename);
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if (compilation.fileDependencies.add) {
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compilation.fileDependencies.add(filename);
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} else {
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// Before Webpack 4 - fileDepenencies was an array
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compilation.fileDependencies.push(filename);
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}
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compilation.assets[basename] = {
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source: () => results.source,
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size: () => results.size.size
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};
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return basename;
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});
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}
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/**
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* Helper to sort chunks
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*/
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sortChunks (chunks, sortMode, compilation) {
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// Custom function
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if (typeof sortMode === 'function') {
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return chunks.sort(sortMode);
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}
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// Check if the given sort mode is a valid chunkSorter sort mode
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if (typeof chunkSorter[sortMode] !== 'undefined') {
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return chunkSorter[sortMode](chunks, this.options, compilation);
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}
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throw new Error('"' + sortMode + '" is not a valid chunk sort mode');
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}
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/**
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* Return all chunks from the compilation result which match the exclude and include filters
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*/
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filterChunks (chunks, includedChunks, excludedChunks) {
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return chunks.filter(chunk => {
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const chunkName = chunk.names[0];
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// This chunk doesn't have a name. This script can't handled it.
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if (chunkName === undefined) {
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return false;
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}
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// Skip if the chunk should be lazy loaded
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if (typeof chunk.isInitial === 'function') {
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if (!chunk.isInitial()) {
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return false;
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}
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} else if (!chunk.initial) {
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return false;
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}
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// Skip if the chunks should be filtered and the given chunk was not added explicity
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if (Array.isArray(includedChunks) && includedChunks.indexOf(chunkName) === -1) {
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return false;
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}
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// Skip if the chunks should be filtered and the given chunk was excluded explicity
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if (Array.isArray(excludedChunks) && excludedChunks.indexOf(chunkName) !== -1) {
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return false;
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}
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// Add otherwise
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return true;
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});
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}
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isHotUpdateCompilation (assets) {
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return assets.js.length && assets.js.every(name => /\.hot-update\.js$/.test(name));
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}
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htmlWebpackPluginAssets (compilation, chunks) {
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const self = this;
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const compilationHash = compilation.hash;
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// Use the configured public path or build a relative path
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let publicPath = typeof compilation.options.output.publicPath !== 'undefined'
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// If a hard coded public path exists use it
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? compilation.mainTemplate.getPublicPath({hash: compilationHash})
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// If no public path was set get a relative url path
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: path.relative(path.resolve(compilation.options.output.path, path.dirname(self.childCompilationOutputName)), compilation.options.output.path)
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.split(path.sep).join('/');
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if (publicPath.length && publicPath.substr(-1, 1) !== '/') {
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publicPath += '/';
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}
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const assets = {
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// The public path
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publicPath: publicPath,
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// Will contain all js & css files by chunk
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chunks: {},
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// Will contain all js files
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js: [],
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// Will contain all css files
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css: [],
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// Will contain the html5 appcache manifest files if it exists
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manifest: Object.keys(compilation.assets).filter(assetFile => path.extname(assetFile) === '.appcache')[0]
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};
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// Append a hash for cache busting
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if (this.options.hash) {
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assets.manifest = self.appendHash(assets.manifest, compilationHash);
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assets.favicon = self.appendHash(assets.favicon, compilationHash);
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}
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for (let i = 0; i < chunks.length; i++) {
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const chunk = chunks[i];
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const chunkName = chunk.names[0];
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assets.chunks[chunkName] = {};
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// Prepend the public path to all chunk files
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let chunkFiles = [].concat(chunk.files).map(chunkFile => publicPath + chunkFile);
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// Append a hash for cache busting
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if (this.options.hash) {
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chunkFiles = chunkFiles.map(chunkFile => self.appendHash(chunkFile, compilationHash));
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}
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// Webpack outputs an array for each chunk when using sourcemaps
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// or when one chunk hosts js and css simultaneously
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const js = chunkFiles.find(chunkFile => /.js($|\?)/.test(chunkFile));
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if (js) {
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assets.chunks[chunkName].size = chunk.size;
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assets.chunks[chunkName].entry = js;
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assets.chunks[chunkName].hash = chunk.hash;
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assets.js.push(js);
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}
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// Gather all css files
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const css = chunkFiles.filter(chunkFile => /.css($|\?)/.test(chunkFile));
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assets.chunks[chunkName].css = css;
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assets.css = assets.css.concat(css);
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}
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// Duplicate css assets can occur on occasion if more than one chunk
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// requires the same css.
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assets.css = _.uniq(assets.css);
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return assets;
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}
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/**
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* Generate meta tags
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*/
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getMetaTags () {
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if (this.options.meta === false) {
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return [];
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}
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// Make tags self-closing in case of xhtml
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// Turn { "viewport" : "width=500, initial-scale=1" } into
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// [{ name:"viewport" content:"width=500, initial-scale=1" }]
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const selfClosingTag = !!this.options.xhtml;
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const metaTagAttributeObjects = Object.keys(this.options.meta).map((metaName) => {
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const metaTagContent = this.options.meta[metaName];
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return (typeof metaTagContent === 'object') ? metaTagContent : {
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name: metaName,
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content: metaTagContent
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};
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});
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// Turn [{ name:"viewport" content:"width=500, initial-scale=1" }] into
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// the html-webpack-plugin tag structure
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return metaTagAttributeObjects.map((metaTagAttributes) => {
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return {
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tagName: 'meta',
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voidTag: true,
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selfClosingTag: selfClosingTag,
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attributes: metaTagAttributes
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};
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});
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}
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/**
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* Injects the assets into the given html string
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*/
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generateHtmlTags (assets) {
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// Turn script files into script tags
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const scripts = assets.js.map(scriptPath => ({
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tagName: 'script',
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closeTag: true,
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attributes: {
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type: 'text/javascript',
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src: scriptPath
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}
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}));
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// Make tags self-closing in case of xhtml
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const selfClosingTag = !!this.options.xhtml;
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// Turn css files into link tags
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const styles = assets.css.map(stylePath => ({
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tagName: 'link',
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selfClosingTag: selfClosingTag,
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voidTag: true,
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attributes: {
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href: stylePath,
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rel: 'stylesheet'
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}
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}));
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// Injection targets
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let head = this.getMetaTags();
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let body = [];
|
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// If there is a favicon present, add it to the head
|
if (assets.favicon) {
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head.push({
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tagName: 'link',
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selfClosingTag: selfClosingTag,
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voidTag: true,
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attributes: {
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rel: 'shortcut icon',
|
href: assets.favicon
|
}
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});
|
}
|
// Add styles to the head
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head = head.concat(styles);
|
// Add scripts to body or head
|
if (this.options.inject === 'head') {
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head = head.concat(scripts);
|
} else {
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body = body.concat(scripts);
|
}
|
return {head: head, body: body};
|
}
|
|
/**
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* Injects the assets into the given html string
|
*/
|
injectAssetsIntoHtml (html, assets, assetTags) {
|
const htmlRegExp = /(<html[^>]*>)/i;
|
const headRegExp = /(<\/head\s*>)/i;
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const bodyRegExp = /(<\/body\s*>)/i;
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const body = assetTags.body.map(this.createHtmlTag.bind(this));
|
const head = assetTags.head.map(this.createHtmlTag.bind(this));
|
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if (body.length) {
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if (bodyRegExp.test(html)) {
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// Append assets to body element
|
html = html.replace(bodyRegExp, match => body.join('') + match);
|
} else {
|
// Append scripts to the end of the file if no <body> element exists:
|
html += body.join('');
|
}
|
}
|
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if (head.length) {
|
// Create a head tag if none exists
|
if (!headRegExp.test(html)) {
|
if (!htmlRegExp.test(html)) {
|
html = '<head></head>' + html;
|
} else {
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html = html.replace(htmlRegExp, match => match + '<head></head>');
|
}
|
}
|
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// Append assets to head element
|
html = html.replace(headRegExp, match => head.join('') + match);
|
}
|
|
// Inject manifest into the opening html tag
|
if (assets.manifest) {
|
html = html.replace(/(<html[^>]*)(>)/i, (match, start, end) => {
|
// Append the manifest only if no manifest was specified
|
if (/\smanifest\s*=/.test(match)) {
|
return match;
|
}
|
return start + ' manifest="' + assets.manifest + '"' + end;
|
});
|
}
|
return html;
|
}
|
|
/**
|
* Appends a cache busting hash
|
*/
|
appendHash (url, hash) {
|
if (!url) {
|
return url;
|
}
|
return url + (url.indexOf('?') === -1 ? '?' : '&') + hash;
|
}
|
|
/**
|
* Turn a tag definition into a html string
|
*/
|
createHtmlTag (tagDefinition) {
|
const attributes = Object.keys(tagDefinition.attributes || {})
|
.filter(attributeName => tagDefinition.attributes[attributeName] !== false)
|
.map(attributeName => {
|
if (tagDefinition.attributes[attributeName] === true) {
|
return attributeName;
|
}
|
return attributeName + '="' + tagDefinition.attributes[attributeName] + '"';
|
});
|
// Backport of 3.x void tag definition
|
const voidTag = tagDefinition.voidTag !== undefined ? tagDefinition.voidTag : !tagDefinition.closeTag;
|
const selfClosingTag = tagDefinition.voidTag !== undefined ? tagDefinition.voidTag && this.options.xhtml : tagDefinition.selfClosingTag;
|
return '<' + [tagDefinition.tagName].concat(attributes).join(' ') + (selfClosingTag ? '/' : '') + '>' +
|
(tagDefinition.innerHTML || '') +
|
(voidTag ? '' : '</' + tagDefinition.tagName + '>');
|
}
|
|
/**
|
* Helper to return the absolute template path with a fallback loader
|
*/
|
getFullTemplatePath (template, context) {
|
// If the template doesn't use a loader use the lodash template loader
|
if (template.indexOf('!') === -1) {
|
template = require.resolve('./lib/loader.js') + '!' + path.resolve(context, template);
|
}
|
// Resolve template path
|
return template.replace(
|
/([!])([^/\\][^!?]+|[^/\\!?])($|\?[^!?\n]+$)/,
|
(match, prefix, filepath, postfix) => prefix + path.resolve(filepath) + postfix);
|
}
|
|
/**
|
* Helper to return a sorted unique array of all asset files out of the
|
* asset object
|
*/
|
getAssetFiles (assets) {
|
const files = _.uniq(Object.keys(assets).filter(assetType => assetType !== 'chunks' && assets[assetType]).reduce((files, assetType) => files.concat(assets[assetType]), []));
|
files.sort();
|
return files;
|
}
|
|
/**
|
* Helper to promisify compilation.applyPluginsAsyncWaterfall that returns
|
* a function that helps to merge given plugin arguments with processed ones
|
*/
|
applyPluginsAsyncWaterfall (compilation) {
|
if (compilation.hooks) {
|
return (eventName, requiresResult, pluginArgs) => {
|
const ccEventName = trainCaseToCamelCase(eventName);
|
if (!compilation.hooks[ccEventName]) {
|
compilation.errors.push(
|
new Error('No hook found for ' + eventName)
|
);
|
}
|
|
return compilation.hooks[ccEventName].promise(pluginArgs);
|
};
|
}
|
|
// Before Webpack 4
|
const promisedApplyPluginsAsyncWaterfall = function (name, init) {
|
return new Promise((resolve, reject) => {
|
const callback = function (err, result) {
|
if (err) {
|
return reject(err);
|
}
|
resolve(result);
|
};
|
compilation.applyPluginsAsyncWaterfall(name, init, callback);
|
});
|
};
|
|
return (eventName, requiresResult, pluginArgs) => promisedApplyPluginsAsyncWaterfall(eventName, pluginArgs)
|
.then(result => {
|
if (requiresResult && !result) {
|
compilation.warnings.push(
|
new Error('Using ' + eventName + ' without returning a result is deprecated.')
|
);
|
}
|
return _.extend(pluginArgs, result);
|
});
|
}
|
}
|
|
/**
|
* Takes a string in train case and transforms it to camel case
|
*
|
* Example: 'hello-my-world' to 'helloMyWorld'
|
*
|
* @param {string} word
|
*/
|
function trainCaseToCamelCase (word) {
|
return word.replace(/-([\w])/g, (match, p1) => p1.toUpperCase());
|
}
|
|
/**
|
* The default for options.templateParameter
|
* Generate the template parameters
|
*/
|
function templateParametersGenerator (compilation, assets, options) {
|
return {
|
compilation: compilation,
|
webpack: compilation.getStats().toJson(),
|
webpackConfig: compilation.options,
|
htmlWebpackPlugin: {
|
files: assets,
|
options: options
|
}
|
};
|
}
|
|
module.exports = HtmlWebpackPlugin;
|
