Merge pull request faceyspacey#73 from faceyspacey/hmr-fix

fix: Manual HMR Option and updated Readme

Author: ScriptedAlchemy

README.md

@@ -19,7 +19,7 @@
   </a>
 
   <a href="https://www.npmjs.com/package/extract-css-chunks-webpack-plugin">
-    <img src="https://img.shields.io/npm/dw/extract-css-chunks-webpack-plugin.svg" alt="License" />
+    <img src="https://img.shields.io/npm/dm/extract-css-chunks-webpack-plugin.svg" alt="License" />
   </a>
 
   <a href="https://www.npmjs.com/package/extract-css-chunks-webpack-plugin">
@@ -91,13 +91,23 @@ module.exports = {
           // Options similar to the same options in webpackOptions.output
           // both options are optional
           filename: "[name].css",
-          chunkFilename: "[id].css"
+          chunkFilename: "[id].css",
+          hot: true // optional is the plguin cannot automatically detect if you are using HOT, not for production use
         }
     ),
   ]
 }
 ```
 
+*webpack.server.config.js*
+
+The server needs to be handeled differently, we still want one chunks. Luckily webpack 4 supports **LimitChunkCountPlugin**
+
+```js
+new webpack.optimize.LimitChunkCountPlugin({
+    maxChunks: 1
+})
+```
 
 
 ### What about Webpack 3?
@@ -116,7 +126,7 @@ If you do need Webpack 3, make sure to stick with the latest `v2.x.x` release. `
 - [babel-plugin-universal-import](https://github.com/faceyspacey/babel-plugin-universal-import) ***or*** [babel-plugin-dual-import](https://github.com/faceyspacey/babel-plugin-dual-import)
 
 
-## Recommended Installation
+## Recommended Installation For Universal
 ```
 yarn add react-universal-component webpack-flush-chunks
 yarn add --dev extract-css-chunks-webpack-plugin babel-plugin-universal-import
@@ -128,6 +138,8 @@ yarn add --dev extract-css-chunks-webpack-plugin babel-plugin-universal-import
   "plugins": ["universal-import"]
 }
 ```
+The main thing is you need to cater for the new chunking system of webpack!
+With **webpack.optimize.CommonsChunkPlugin** plugin no longer part of Webpack 4, we need another way to define the code-splitting. Luckily we have `optimization` configs built into webpack now
 
 *webpack.config.js:*
 ```js
@@ -151,8 +163,38 @@ module.exports = {
       },
     ],
   },
+  optimization: {
+      // FOR PRODUCTION
+      minimizer: [
+          new UglifyJSPlugin({
+              uglifyOptions: {
+                  output: {
+                      comments: false,
+                      ascii_only: true
+                  },
+                  compress: {
+                      comparisons: false
+                  }
+              }
+          })
+      ],
+      // END
+      // NEEDED BOTH IN PROD AND DEV BUILDS
+      runtimeChunk: {
+          name: 'bootstrap'
+      },
+      splitChunks: {
+          chunks: 'initial', // <-- The key to this
+          cacheGroups: {
+              vendors: {
+                  test: /[\\/]node_modules[\\/]/,
+                  name: 'vendor'
+              }
+          }
+      }
+  },
   plugins: [
-    new ExtractCssChunks(),
+    new ExtractCssChunks({hot:true}), //if you want HMR - we try to automatically inject hot reloading but if its not working, add it to the config
   ]
 };
 ```
@@ -256,7 +298,7 @@ For example, when running the build using some form of npm script:
 ```json
 {
   "scripts": {
-    "build": "cross-env NODE_ENV=development webpack --config build/webpack.config.js"
+     "build": "cross-env NODE_ENV=production babel src -d dist --ignore 'src/**/*.test.js' --copy-files"
   }
 }
 ```

package.json

@@ -13,12 +13,23 @@
   "files": [
     "dist"
   ],
+  "keywords": [
+    "css",
+    "chunks",
+    "code splitting",
+    "mini-css",
+    "hot",
+    "hmr",
+    "universal",
+    "webpack",
+    "webpack 4"
+  ],
   "license": "MIT",
   "scripts": {
     "start": "npm run build -- -w",
     "build": "cross-env NODE_ENV=production babel src -d dist --ignore 'src/**/*.test.js' --copy-files",
     "clean": "del-cli dist",
-    "lint": "eslint --cache --fix src test",
+    "lint": "eslint --cache --fix src",
     "prebuild": "npm run clean",
     "prepublish": "npm run build",
     "security": "nsp check",

src/index.js

@@ -146,31 +146,29 @@ class ExtractCssChunks {
   }
 
   apply(compiler) {
-    if (process.env.NODE_ENV === 'development') {
-      try {
-        const isHOT = isHMR(compiler);
-
-        if (isHOT && compiler.options.module && compiler.options.module.rules) {
-          const updatedRules = compiler.options.module.rules.reduce((rules, rule) => {
-            if (rule.use && Array.isArray(rule.use)) {
-              const isMiniCss = rule.use.some((l) => {
-                const needle = l.loader || l;
-                return needle.includes(pluginName);
-              });
-              if (isMiniCss) {
-                rule.use.unshift(hotLoader);
-              }
+    try {
+      const isHOT = this.options.hot ? true : isHMR(compiler);
+
+      if (isHOT && compiler.options.module && compiler.options.module.rules) {
+        const updatedRules = compiler.options.module.rules.reduce((rules, rule) => {
+          if (rule.use && Array.isArray(rule.use)) {
+            const isMiniCss = rule.use.some((l) => {
+              const needle = l.loader || l;
+              return needle.includes(pluginName);
+            });
+            if (isMiniCss) {
+              rule.use.unshift(hotLoader);
             }
-            rules.push(rule);
+          }
+          rules.push(rule);
 
-            return rules;
-          }, []);
+          return rules;
+        }, []);
 
-          compiler.options.module.rules = updatedRules;
-        }
-      } catch (e) {
-        console.error('Something went wrong: contact the author', JSON.stringify(e)); // eslint-disable-line no-console
+        compiler.options.module.rules = updatedRules;
       }
+    } catch (e) {
+      console.error('Something went wrong: contact the author', JSON.stringify(e)); // eslint-disable-line no-console
     }
 
     compiler.hooks.thisCompilation.tap(pluginName, (compilation) => {

test/manual/webpack.config.js

@@ -25,6 +25,7 @@ const config = {
     new Self({
       filename: '[name].css',
       chunkFilename: '[contenthash].css',
+      hot: false
     }),
 
     new webpack.NamedModulesPlugin(),