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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,214 @@ | ||
| /** | ||
| * Copyright 2018 Google LLC | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| * use this file except in compliance with the License. You may obtain a copy of | ||
| * the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations under | ||
| * the License. | ||
| * | ||
| * https://github.com/GoogleChromeLabs/critters/blob/main/packages/critters-webpack-plugin/src/index.js | ||
| */ | ||
|
|
||
| /** | ||
| * Critters does not (yet) support `html-webpack-plugin` v5, so we vendor it. | ||
| */ | ||
|
|
||
| const path = require('path'); | ||
| const minimatch = require('minimatch'); | ||
| const { sources } = require('webpack'); | ||
| const Critters = require('critters'); | ||
| const HtmlWebpackPlugin = require('html-webpack-plugin'); | ||
|
|
||
| function tap(inst, hook, pluginName, async, callback) { | ||
| if (inst.hooks) { | ||
| const camel = hook.replace(/-([a-z])/g, (_s, i) => i.toUpperCase()); | ||
| inst.hooks[camel][async ? 'tapAsync' : 'tap'](pluginName, callback); | ||
| } else { | ||
| inst.plugin(hook, callback); | ||
| } | ||
| } | ||
|
|
||
| // Used to annotate this plugin's hooks in Tappable invocations | ||
| const PLUGIN_NAME = 'critters-webpack-plugin'; | ||
|
|
||
| /** | ||
| * Create a Critters plugin instance with the given options. | ||
| * @public | ||
| * @param {import('critters').Options} options Options to control how Critters inlines CSS. See https://github.com/GoogleChromeLabs/critters#usage | ||
| * @example | ||
| * // webpack.config.js | ||
| * module.exports = { | ||
| * plugins: [ | ||
| * new Critters({ | ||
| * // Outputs: <link rel="preload" onload="this.rel='stylesheet'"> | ||
| * preload: 'swap', | ||
| * | ||
| * // Don't inline critical font-face rules, but preload the font URLs: | ||
| * preloadFonts: true | ||
| * }) | ||
| * ] | ||
| * } | ||
| */ | ||
| module.exports = class CrittersWebpackPlugin extends Critters { | ||
| /** | ||
| * @param {import('critters').Options} options | ||
| */ | ||
| constructor(options) { | ||
| super(options); | ||
| } | ||
|
|
||
| /** | ||
| * Invoked by Webpack during plugin initialization | ||
| */ | ||
| apply(compiler) { | ||
| // hook into the compiler to get a Compilation instance... | ||
| tap(compiler, 'compilation', PLUGIN_NAME, false, compilation => { | ||
| this.options.path = compiler.options.output.path; | ||
| this.options.publicPath = compiler.options.output.publicPath; | ||
|
|
||
| const handleHtmlPluginData = (htmlPluginData, callback) => { | ||
| this.fs = compilation.outputFileSystem; | ||
| this.compilation = compilation; | ||
| this.process(htmlPluginData.html) | ||
| .then(html => { | ||
| callback(null, { html }); | ||
| }) | ||
| .catch(callback); | ||
| }; | ||
|
|
||
| HtmlWebpackPlugin.getHooks(compilation).beforeEmit.tapAsync( | ||
| PLUGIN_NAME, | ||
| handleHtmlPluginData | ||
| ); | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Given href, find the corresponding CSS asset | ||
| */ | ||
| async getCssAsset(href, style) { | ||
| const outputPath = this.options.path; | ||
| const publicPath = this.options.publicPath; | ||
|
|
||
| // CHECK - the output path | ||
| // path on disk (with output.publicPath removed) | ||
| let normalizedPath = href.replace(/^\//, ''); | ||
| const pathPrefix = (publicPath || '').replace(/(^\/|\/$)/g, '') + '/'; | ||
| if (normalizedPath.indexOf(pathPrefix) === 0) { | ||
| normalizedPath = normalizedPath | ||
| .substring(pathPrefix.length) | ||
| .replace(/^\//, ''); | ||
| } | ||
| const filename = path.resolve(outputPath, normalizedPath); | ||
|
|
||
| // try to find a matching asset by filename in webpack's output (not yet written to disk) | ||
| const relativePath = path | ||
| .relative(outputPath, filename) | ||
| .replace(/^\.\//, ''); | ||
| const asset = this.compilation.assets[relativePath]; // compilation.assets[relativePath]; | ||
|
|
||
| // Attempt to read from assets, falling back to a disk read | ||
| let sheet = asset && asset.source(); | ||
|
|
||
| if (!sheet) { | ||
| try { | ||
| sheet = await this.readFile(this.compilation, filename); | ||
| this.logger.warn( | ||
| `Stylesheet "${relativePath}" not found in assets, but a file was located on disk.${ | ||
| this.options.pruneSource | ||
| ? ' This means pruneSource will not be applied.' | ||
| : '' | ||
| }` | ||
| ); | ||
| } catch (e) { | ||
| this.logger.warn(`Unable to locate stylesheet: ${relativePath}`); | ||
| return; | ||
| } | ||
| } | ||
|
|
||
| style.$$asset = asset; | ||
| style.$$assetName = relativePath; | ||
| // style.$$assets = this.compilation.assets; | ||
|
|
||
| return sheet; | ||
| } | ||
|
|
||
| checkInlineThreshold(link, style, sheet) { | ||
| const inlined = super.checkInlineThreshold(link, style, sheet); | ||
|
|
||
| if (inlined) { | ||
| const asset = style.$$asset; | ||
| if (asset) { | ||
| delete this.compilation.assets[style.$$assetName]; | ||
| } else { | ||
| this.logger.warn( | ||
| ` > ${style.$$name} was not found in assets. the resource may still be emitted but will be unreferenced.` | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| return inlined; | ||
| } | ||
|
|
||
| /** | ||
| * Inline the stylesheets from options.additionalStylesheets (assuming it passes `options.filter`) | ||
| */ | ||
| async embedAdditionalStylesheet(document) { | ||
| const styleSheetsIncluded = []; | ||
| (this.options.additionalStylesheets || []).forEach(cssFile => { | ||
| if (styleSheetsIncluded.includes(cssFile)) { | ||
| return; | ||
| } | ||
| styleSheetsIncluded.push(cssFile); | ||
| const webpackCssAssets = Object.keys(this.compilation.assets).filter( | ||
| file => minimatch(file, cssFile) | ||
| ); | ||
| webpackCssAssets.map(asset => { | ||
| const style = document.createElement('style'); | ||
| style.$$external = true; | ||
| style.textContent = this.compilation.assets[asset].source(); | ||
| document.head.appendChild(style); | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Prune the source CSS files | ||
| */ | ||
| pruneSource(style, before, sheetInverse) { | ||
| const isStyleInlined = super.pruneSource(style, before, sheetInverse); | ||
| const asset = style.$$asset; | ||
| const name = style.$$name; | ||
|
|
||
| if (asset) { | ||
| // if external stylesheet would be below minimum size, just inline everything | ||
| const minSize = this.options.minimumExternalSize; | ||
| if (minSize && sheetInverse.length < minSize) { | ||
| // delete the webpack asset: | ||
| delete this.compilation.assets[style.$$assetName]; | ||
| return true; | ||
| } | ||
| this.compilation.assets[style.$$assetName] = | ||
| new sources.LineToLineMappedSource( | ||
| sheetInverse, | ||
| style.$$assetName, | ||
| before | ||
| ); | ||
| } else { | ||
| this.logger.warn( | ||
| 'pruneSource is enabled, but a style (' + | ||
| name + | ||
| ') has no corresponding Webpack asset.' | ||
| ); | ||
| } | ||
|
|
||
| return isStyleInlined; | ||
| } | ||
| }; |
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