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| 1 | +/** |
| 2 | + * @license |
| 3 | + * Copyright Google Inc. All Rights Reserved. |
| 4 | + * |
| 5 | + * Use of this source code is governed by an MIT-style license that can be |
| 6 | + * found in the LICENSE file at https://angular.io/license |
| 7 | + */ |
| 8 | +import { Compiler } from 'webpack'; |
| 9 | +import { RawSource, SourceMapSource } from 'webpack-sources'; |
| 10 | + |
| 11 | +const CleanCSS = require('clean-css'); |
| 12 | + |
| 13 | +interface Chunk { |
| 14 | + files: string[]; |
| 15 | +} |
| 16 | + |
| 17 | +export interface CleanCssWebpackPluginOptions { |
| 18 | + sourceMap: boolean; |
| 19 | +} |
| 20 | + |
| 21 | +export class CleanCssWebpackPlugin { |
| 22 | + |
| 23 | + constructor(private options: Partial<CleanCssWebpackPluginOptions> = {}) {} |
| 24 | + |
| 25 | + apply(compiler: Compiler): void { |
| 26 | + compiler.plugin('compilation', (compilation: any) => { |
| 27 | + compilation.plugin('optimize-chunk-assets', |
| 28 | + (chunks: Array<Chunk>, callback: (err?: Error) => void) => { |
| 29 | + |
| 30 | + const cleancss = new CleanCSS({ |
| 31 | + compatibility: 'ie9', |
| 32 | + level: 2, |
| 33 | + inline: false, |
| 34 | + returnPromise: true, |
| 35 | + sourceMap: this.options.sourceMap, |
| 36 | + }); |
| 37 | + |
| 38 | + const files: string[] = [...compilation.additionalChunkAssets]; |
| 39 | + |
| 40 | + chunks.forEach(chunk => { |
| 41 | + if (chunk.files && chunk.files.length > 0) { |
| 42 | + files.push(...chunk.files); |
| 43 | + } |
| 44 | + }); |
| 45 | + |
| 46 | + const actions = files |
| 47 | + .filter(file => file.endsWith('.css')) |
| 48 | + .map(file => { |
| 49 | + const asset = compilation.assets[file]; |
| 50 | + if (!asset) { |
| 51 | + return Promise.resolve(); |
| 52 | + } |
| 53 | + |
| 54 | + let content: string; |
| 55 | + let map: any; |
| 56 | + if (asset.sourceAndMap) { |
| 57 | + const sourceAndMap = asset.sourceAndMap(); |
| 58 | + content = sourceAndMap.source; |
| 59 | + map = sourceAndMap.map; |
| 60 | + } else { |
| 61 | + content = asset.source(); |
| 62 | + } |
| 63 | + |
| 64 | + if (content.length === 0) { |
| 65 | + return Promise.resolve(); |
| 66 | + } |
| 67 | + |
| 68 | + return Promise.resolve() |
| 69 | + .then(() => cleancss.minify(content, map)) |
| 70 | + .then((output: any) => { |
| 71 | + let hasWarnings = false; |
| 72 | + if (output.warnings && output.warnings.length > 0) { |
| 73 | + compilation.warnings.push(...output.warnings); |
| 74 | + hasWarnings = true; |
| 75 | + } |
| 76 | + |
| 77 | + if (output.errors && output.errors.length > 0) { |
| 78 | + output.errors |
| 79 | + .forEach((error: string) => compilation.errors.push(new Error(error))); |
| 80 | + return; |
| 81 | + } |
| 82 | + |
| 83 | + // generally means invalid syntax so bail |
| 84 | + if (hasWarnings && output.stats.minifiedSize === 0) { |
| 85 | + return; |
| 86 | + } |
| 87 | + |
| 88 | + let newSource; |
| 89 | + if (output.sourceMap) { |
| 90 | + newSource = new SourceMapSource( |
| 91 | + output.styles, |
| 92 | + file, |
| 93 | + output.sourceMap.toString(), |
| 94 | + content, |
| 95 | + map, |
| 96 | + ); |
| 97 | + } else { |
| 98 | + newSource = new RawSource(output.styles); |
| 99 | + } |
| 100 | + |
| 101 | + compilation.assets[file] = newSource; |
| 102 | + }); |
| 103 | + }); |
| 104 | + |
| 105 | + Promise.all(actions) |
| 106 | + .then(() => callback()) |
| 107 | + .catch(err => callback(err)); |
| 108 | + }); |
| 109 | + }); |
| 110 | + } |
| 111 | +} |
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