breaking: change to webpack 5

.eslintignore

@@ -1,3 +1,2 @@
-dist/**/*
+dist
 node_modules
-example

.eslintrc

@@ -1,4 +1,4 @@
 extends:
-  - metalab
-rules:
-  metalab/filenames/match-exported: 0
+  - standard
+env:
+  mocha: true

.gitignore

@@ -1,3 +1,4 @@
+.idea
 node_modules
 *.log
 dist

.npmignore

@@ -1,4 +1,2 @@
-node_modules
-examples
-*.log
-coverage
+/*
+!/lib

README.md

@@ -18,13 +18,14 @@ npm install --save fast-css-split-webpack-plugin
 
 ## Usage
 
-Simply add an instance of `FastCSSSplitWebpackPlugin` to your list of plugins in your webpack configuration file _after_ `ExtractTextPlugin`. That's it!
+Simply add an instance of `FastCSSSplitWebpackPlugin` to your list of plugins in your webpack configuration file _after_ `MiniCssExtractPlugin`. That's it!
 
 ```javascript
-var ExtractTextPlugin = require('extract-text-webpack-plugin');
-var FastCSSSplitWebpackPlugin = require('../');
+var MiniCssExtractPlugin = require('mini-css-extract-plugin');
+var FastCSSSplitWebpackPlugin = require('fast-css-split-webpack-plugin');
 
 module.exports = {
+  mode: 'development',
   entry: './index.js',
   context: __dirname,
   output: {
@@ -33,13 +34,16 @@ module.exports = {
     filename: 'bundle.js',
   },
   module: {
-    loaders: [{
+    rules: [{
       test: /\.css$/,
-      loader: ExtractTextPlugin.extract('style-loader', 'css-loader'),
-    }],
+      use: [MiniCssExtractPlugin.loader, {
+        loader: 'css-loader',
+        options: {sourceMap: true}
+      }]
+    }]
   },
   plugins: [
-    new ExtractTextPlugin('styles.css'),
+    new MiniCssExtractPlugin({filename: 'styles.css'}),
     new FastCSSSplitWebpackPlugin({size: 4000}),
   ],
 };
@@ -55,9 +59,8 @@ The following configuration options are available:
 
 **preserve**: `default: false`. Keep the original unsplit file as well. Sometimes this is desirable if you want to target a specific browser (IE) with the split files and then serve the unsplit ones to everyone else.
 
-**defer**: `default: 'false'`. You can pass `true` here to cause this plugin to split the CSS on the `emit` phase. Sometimes this is needed if you have other plugins that operate on the CSS also in the emit phase. Unfortunately by doing this you potentially lose chunk linking and source maps. Use only when necessary.
+**defer**: `default: 'false'`. You can pass `true` here to cause this plugin to split the CSS on the `afterProcessAssets` phase. Sometimes this is needed if you have other plugins that operate on the CSS also in the same phase. Unfortunately by doing this you potentially lose chunk linking and source maps. Use only when necessary.
 
 [webpack]: http://webpack.github.io/
-[herp]: https://github.com/ONE001/css-file-rules-webpack-separator
 [postcss]: https://github.com/postcss/postcss
 [postcss-chunk]: https://github.com/mattfysh/postcss-chunk

example/basic/webpack.config.js

@@ -1,7 +1,11 @@
-var ExtractTextPlugin = require('extract-text-webpack-plugin')
-var FastCSSSplitWebpackPlugin = require('../../')
+const MiniCssExtractPlugin = require('mini-css-extract-plugin')
+const FastCSSSplitWebpackPlugin = require('../../')
+
+/* eslint object-curly-spacing: [error, never] */
+/* eslint node/no-path-concat: off */
 
 module.exports = {
+  mode: 'development',
   entry: './index.js',
   context: __dirname,
   output: {
@@ -10,19 +14,17 @@ module.exports = {
     filename: 'bundle.js'
   },
   module: {
-    loaders: [{
+    rules: [{
       test: /\.css$/,
-      loader: ExtractTextPlugin.extract.length !== 1
-        ? ExtractTextPlugin.extract('style-loader', 'css-loader')
-        : ExtractTextPlugin.extract({
-          fallbackLoader: 'style-loader',
-          loader: 'css-loader'
-        })
+      use: [MiniCssExtractPlugin.loader, {
+        loader: 'css-loader',
+        options: {sourceMap: true}
+      }]
     }]
   },
   devtool: 'source-map',
   plugins: [
-    new ExtractTextPlugin('styles.css'),
+    new MiniCssExtractPlugin({filename: 'styles.css'}),
     new FastCSSSplitWebpackPlugin({size: 3, imports: true})
   ]
 }

example/less/webpack.config.js

@@ -1,7 +1,11 @@
-var ExtractTextPlugin = require('extract-text-webpack-plugin')
-var FastCSSSplitWebpackPlugin = require('../../')
+const MiniCssExtractPlugin = require('mini-css-extract-plugin')
+const FastCSSSplitWebpackPlugin = require('../../')
+
+/* eslint object-curly-spacing: [error, never] */
+/* eslint node/no-path-concat: off */
 
 module.exports = {
+  mode: 'development',
   entry: './index.js',
   context: __dirname,
   output: {
@@ -10,16 +14,20 @@ module.exports = {
     filename: 'bundle.js'
   },
   module: {
-    loaders: [{
+    rules: [{
       test: /\.less$/,
-      loader: ExtractTextPlugin.extract(
-        'css?-url&-autoprefixer&sourceMap!less?sourceMap'
-      )
+      use: [MiniCssExtractPlugin.loader, {
+        loader: 'css-loader',
+        options: {sourceMap: true, url: false}
+      }, {
+        loader: 'less-loader',
+        options: {sourceMap: true}
+      }]
     }]
   },
   devtool: 'source-map',
   plugins: [
-    new ExtractTextPlugin('styles.css'),
+    new MiniCssExtractPlugin({filename: 'styles.css'}),
     new FastCSSSplitWebpackPlugin({size: 3})
   ]
 }

lib/index.js

@@ -2,7 +2,7 @@
 
 const path = require('path')
 const split = require('css-split')
-const { RawSource } = require('webpack-sources')
+const { sources: { RawSource }, Compilation } = require('webpack')
 const { interpolateName } = require('loader-utils')
 
 /**
@@ -68,27 +68,32 @@ const normalizeImports = (input, preserve) => {
 class FastCSSSplitWebpackPlugin {
   /**
    * Create new instance of FastCSSSplitWebpackPlugin.
-   * @param {Number} size Maximum number of rules for a single file.
-   * @param {Boolean|String} imports Truish to generate an additional import
+   * @param [options]
+   * @param {Number} [options.size] Maximum number of rules for a single file.
+   * @param {Boolean|String} [options.imports] Truish to generate an additional import
    * asset. When a boolean use the default name for the asset.
-   * @param {String} filename Control the generated split file name.
-   * @param {Boolean} defer Defer splitting until the `emit` phase. Normally
-   * only needed if something else in your pipeline is mangling things at
-   * the emit phase too.
-   * @param {Boolean} preserve True to keep the original unsplit file.
+   * @param {String} [options.filename] Control the generated split file name.
+   * @param {Number} [options.stage] only valid while [options.defer] is false
+   * see <https://webpack.js.org/api/compilation-hooks/#additional-assets>
+   * @param {Boolean} [options.defer] Defer splitting until the `afterProcessAssets`
+   * phase. Normally only needed if something else in your pipeline is mangling
+   * things at the same phase too.
+   * @param {Boolean} [options.preserve] True to keep the original unsplit file.
    */
   constructor ({
     size = 4000,
     imports = false,
     filename = '[name]-[part].[ext]',
     preserve,
+    stage = Compilation.PROCESS_ASSETS_STAGE_DEV_TOOLING,
     defer = false
-  }) {
+  } = {}) {
     this.options = {
       size,
       imports: normalizeImports(imports, preserve),
       filename: nameInterpolator(filename),
       preserve,
+      stage,
       defer
     }
   }
@@ -97,7 +102,6 @@ class FastCSSSplitWebpackPlugin {
    * Generate the split chunks for a given CSS file.
    * @param {String} key Name of the file.
    * @param {Object} asset Valid webpack Source object.
-   * @returns {Promise} Promise generating array of new files.
    */
   file (key, asset) {
     const input = {
@@ -124,12 +128,12 @@ class FastCSSSplitWebpackPlugin {
     }
   }
 
-  chunksMapping (compilation, chunks, done) {
+  chunksMapping (compilation) {
     const assets = compilation.assets
     const publicPath = strip(compilation.options.output.publicPath || './')
 
-    chunks.map((chunk) => {
-      const input = chunk.files.filter(isCSS)
+    for (const chunk of compilation.chunks) {
+      const input = [...chunk.files].filter(isCSS)
       const entries = input.map((name) => this.file(name, assets[name]))
 
       entries.forEach((entry) => {
@@ -145,7 +149,7 @@ class FastCSSSplitWebpackPlugin {
           // - ...
           entry.chunks.forEach((file) => {
             assets[file.fullname] = file
-            chunk.files.push(file.fullname)
+            chunk.files.add(file.fullname)
           })
 
           // generate imports file content
@@ -162,7 +166,7 @@ class FastCSSSplitWebpackPlugin {
 
         // if chunks.length == 1, the original chunk will be always preserved
         if (entry.chunks.length > 1 && !this.options.preserve) {
-          chunk.files.splice(chunk.files.indexOf(entry.file), 1)
+          chunk.files.delete(entry.file)
           delete assets[entry.file]
         }
 
@@ -176,12 +180,10 @@ class FastCSSSplitWebpackPlugin {
             imports = `${entry.dirname}/${imports}`
           }
           assets[imports] = importsFile
-          chunk.files.push(imports)
+          chunk.files.add(imports)
         }
       })
-    })
-
-    done()
+    }
   }
 
   /**
@@ -195,44 +197,25 @@ class FastCSSSplitWebpackPlugin {
    * @returns {void}
    */
   apply (compiler) {
-    // for webpack 4
-    if (compiler.hooks) {
-      const plugin = {
-        name: 'FastCssSplitPlugin'
-      }
-
-      if (this.options.defer) {
-        // Run on `emit` when user specifies the compiler phase
+    const name = 'FastCssSplitPlugin'
+    const { defer, stage } = this.options
+
+    // Only run on `thisCompilation` to avoid injecting the plugin into
+    // sub-compilers as happens when using the `mini-css-extract-plugin`.
+    compiler.hooks.thisCompilation.tap(name, compilation => {
+      if (defer) {
+        // Run on `afterProcessAssets` when user specifies the compiler phase
         // Due to the incorrect css split + optimization behavior
         // Expected: css split should happen after optimization
-        compiler.hooks.emit.tapAsync(plugin, (compilation, done) => {
-          this.chunksMapping(compilation, compilation.chunks, done)
+        compilation.hooks.afterProcessAssets.tap(name, () => {
+          this.chunksMapping(compilation)
         })
       } else {
-        // use compilation instead of this-compilation, just like other plugins do
-        compiler.hooks.compilation.tap(plugin, compilation => {
-          compilation.hooks.optimizeChunkAssets.tapAsync(plugin, (chunks, done) => {
-            this.chunksMapping(compilation, chunks, done)
-          })
+        compilation.hooks.processAssets.tap({ name, stage }, () => {
+          this.chunksMapping(compilation)
         })
       }
-    } else {
-      if (this.options.defer) {
-        // Run on `emit` when user specifies the compiler phase
-        // Due to the incorrect css split + optimization behavior
-        // Expected: css split should happen after optimization
-        compiler.plugin('emit', (compilation, done) => {
-          return this.chunksMapping(compilation, compilation.chunks, done)
-        })
-      } else {
-        // use compilation instead of this-compilation, just like other plugins do
-        compiler.plugin('compilation', (compilation) => {
-          compilation.plugin('optimize-chunk-assets', (chunks, done) => {
-            return this.chunksMapping(compilation, chunks, done)
-          })
-        })
-      }
-    }
+    })
   }
 }
 

package.json

@@ -1,9 +1,9 @@
 {
   "name": "fast-css-split-webpack-plugin",
-  "version": "1.0.4",
+  "version": "2.0.0",
   "author": "yibn2008 <yibn2008@qq.com>",
   "license": "CC0-1.0",
-  "repository": "metalabdesign/css-split-webpack-plugin",
+  "repository": "yibn2008/fast-css-split-webpack-plugin",
   "main": "lib/index.js",
   "keywords": [
     "webpack-plugin",
@@ -15,39 +15,31 @@
     "spec": "NODE_ENV=test ./node_modules/.bin/_mocha --timeout 5000 -r adana-dump -R spec --recursive test/spec/**/*.spec.js"
   },
   "standard": {
-    "global": [
-      "describe",
-      "it",
-      "beforeEach",
-      "afterEach"
-    ],
-    "ignore": [
-      "/test",
-      "/example"
+    "env": [
+      "mocha"
     ]
   },
   "devDependencies": {
     "adana-cli": "^0.1.1",
     "adana-dump": "^0.1.0",
     "adana-format-lcov": "^0.1.1",
     "chai": "^3.5.0",
-    "css-loader": "^0.23.1",
-    "extract-text-webpack-plugin": "^1.0.1",
-    "less": "^2.7.1",
-    "less-loader": "^2.2.3",
+    "css-loader": "^6.2.0",
+    "mini-css-extract-plugin": "^2.2.0",
+    "less": "^4.1.1",
+    "less-loader": "^10.0.1",
     "memory-fs": "^0.3.0",
     "mocha": "3.x",
-    "optimize-css-assets-webpack-plugin": "^3.2.0",
-    "standard": "^11.0.1",
-    "style-loader": "^0.13.1",
-    "webpack": "^1.13.0"
+    "css-minimizer-webpack-plugin": "^3.0.2",
+    "standard": "^16.0.3",
+    "style-loader": "^3.2.1",
+    "webpack": "^5.50.0"
   },
   "dependencies": {
     "css-split": "^1.1.3",
-    "loader-utils": "^1.1.0",
-    "webpack-sources": "^1.0.2"
+    "loader-utils": "^1.4.0"
   },
   "peerDependencies": {
-    "webpack": ">=1"
+    "webpack": ">=5"
   }
 }