无法使用Webpack 2.2.0和webpack-dev-server 2.2.1进行HMR（热模块替换）css / scss

时间：2017-01-31 13:15:42

标签： webpack webpack-dev-server hot-module-replacement extract-text-plugin extracttextwebpackplugin

版本

＆＃34; extract-text-webpack-plugin＆＃34;：＆＃34; ^ 2.0.0-rc.2＆＃34;，

＆＃34; webpack＆＃34;：＆＃34; ^ 2.2.0＆＃34;，

＆＃34; webpack-dev-server＆＃34;：＆＃34; ^ 2.2.1＆＃34;

问题

＆＃34; extract-text-webpack-plugin＆＃34;：＆＃34; ^ 1.0.1＆＃34;，

＆＃34; webpack＆＃34;：＆＃34; ^ 1.14.0＆＃34;，

＆＃34; webpack-dev-server＆＃34;：＆＃34; ^ 1.16.2＆＃34;

升级到版本2后不再能够使用HMR css / scss，更改样式会触发更改（请参阅下面的输出示例），但是我必须手动刷新页面以查看页面不会自动刷新的更改，如果我在更改scss文件后对js文件进行了更改，然后将更改反映为js更改触发HMR，其中还包括样式更改，但只更改没有js更改的样式需要手动页面刷新。

如果我为css / scss HMR配置错误或需要做什么，有什么想法吗？

我也在这里发布了这个问题：https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/384但不确定它是webpack-dev-server问题还是extract-text-webpack-plugin问题，或者只是我做过的事情。

命令正在运行：

npm run dev 

"scripts": {
    "dev": "webpack-dev-server --hot --inline"
  }
升级前的

配置： 

const webpack = require('webpack');
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

const BUILD_DIR = path.resolve(__dirname, 'public');
const APP_DIR = path.resolve(__dirname, 'app');

let generateHtml = new HtmlWebpackPlugin({ title: 'My App' });
let extractCSS = new ExtractTextPlugin('styles/[name].css', { allChunks: true });

const config = {
  entry: APP_DIR + '/index.js',
  output: {
    path: BUILD_DIR,
    filename: 'bundle.js'
  },
  externals: {
    'cheerio': 'window',
    'react/lib/ExecutionEnvironment': true,
    'react/lib/ReactContext': true,
  },
  module : {
    loaders : [
      {
        test : /\.jsx?/,
        include : APP_DIR,
        loader : 'babel'
      },
      {
        test: /\.scss$/,
        loader: extractCSS.extract('style', 'css?modules=true!sass?sourceMap=true')
      }
    ]
  },
  plugins: [
    generateHtml,
    extractCSS
  ]
};

module.exports = config;
升级后

配置： 

const webpack = require('webpack');
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

const BUILD_DIR = path.resolve(__dirname, 'public');
const APP_DIR = path.resolve(__dirname, 'app');

let generateHtml = new HtmlWebpackPlugin({ title: 'My App' });
let extractCSS = new ExtractTextPlugin({ filename: 'styles/[name].css', allChunks: true });

const config = {
  entry: APP_DIR + '/index.js',
  output: {
    path: BUILD_DIR,
    filename: 'bundle.js'
  },
  externals: {
    'cheerio': 'window',
    'react/lib/ExecutionEnvironment': true,
    'react/lib/ReactContext': true,
  },
  module : {
    loaders : [
      {
        test : /\.(js|jsx)?/,
        include : APP_DIR,
        loader : 'babel-loader'
      },
      {
        test: /\.scss$/,
        loader: extractCSS.extract({
          fallbackLoader: 'style-loader',
          loader: ['css-loader?modules', 'sass-loader']
        })
      }
    ]
  },
  plugins: [
    generateHtml,
    extractCSS
  ]
};

module.exports = config;

输出样本初始页面加载。 

> webpack-dev-server --hot --inline

Project is running at http://localhost:8080/
webpack output is served from /
Hash: 0e873f689fcea2b7cee6
Version: webpack 2.2.0
Time: 3350ms
          Asset       Size  Chunks                    Chunk Names
      bundle.js     1.1 MB       0  [emitted]  [big]  main
styles/main.css  634 bytes       0  [emitted]         main
     index.html  223 bytes          [emitted]         
chunk    {0} bundle.js, styles/main.css (main) 1.03 MB [entry] [rendered]
   [19] ./~/react/react.js 56 bytes {0} [built]
   [45] ./~/redux/es/index.js 1.08 kB {0} [built]
  [106] ./~/react-redux/es/index.js 194 bytes {0} [built]
  [129] (webpack)/hot/emitter.js 77 bytes {0} [built]
  [130] ./app/index.js 938 bytes {0} [built]
  [131] (webpack)-dev-server/client?http://localhost:8080 4.66 kB {0} [built]
  [132] (webpack)/hot/dev-server.js 1.57 kB {0} [built]
  [139] ./app/containers/App.js 4.25 kB {0} [built]
  [178] ./~/react-dom/index.js 59 bytes {0} [built]
  [269] ./~/redux-thunk/lib/index.js 529 bytes {0} [built]
  [300] ./~/strip-ansi/index.js 161 bytes {0} [built]
  [305] ./~/url/url.js 23.3 kB {0} [built]
  [307] (webpack)-dev-server/client/socket.js 856 bytes {0} [built]
  [309] (webpack)/hot/log-apply-result.js 1.02 kB {0} [built]
  [310] multi (webpack)-dev-server/client?http://localhost:8080 webpack/hot/dev-server ./app/index.js 52 bytes {0} [built]
     + 296 hidden modules
Child html-webpack-plugin for "index.html":
    chunk    {0} index.html 541 kB [entry] [rendered]
        [0] ./~/lodash/lodash.js 540 kB {0} [built]
        [1] (webpack)/buildin/global.js 509 bytes {0} [built]
        [2] (webpack)/buildin/module.js 517 bytes {0} [built]
        [3] ./~/html-webpack-plugin/lib/loader.js!./~/html-webpack-plugin/default_index.ejs 540 bytes {0} [built]
Child extract-text-webpack-plugin:
    chunk    {0} extract-text-webpack-plugin-output-filename 1.77 kB [entry] [rendered]
        [0] ./~/css-loader/lib/css-base.js 1.51 kB {0} [built]
        [1] ./~/css-loader?modules!./~/sass-loader!./app/components/user/users.scss 267 bytes {0} [built]
Child extract-text-webpack-plugin:
    chunk    {0} extract-text-webpack-plugin-output-filename 1.81 kB [entry] [rendered]
        [0] ./~/css-loader/lib/css-base.js 1.51 kB {0} [built]
        [1] ./~/css-loader?modules!./~/sass-loader!./app/containers/app.scss 307 bytes {0} [built]
Child extract-text-webpack-plugin:
    chunk    {0} extract-text-webpack-plugin-output-filename 2.21 kB [entry] [rendered]
        [0] ./~/css-loader/lib/css-base.js 1.51 kB {0} [built]
        [1] ./~/css-loader?modules!./~/sass-loader!./app/components/navbar/navbar.scss 702 bytes {0} [built]
Child extract-text-webpack-plugin:
    chunk    {0} extract-text-webpack-plugin-output-filename 1.87 kB [entry] [rendered]
        [0] ./~/css-loader/lib/css-base.js 1.51 kB {0} [built]
        [1] ./~/css-loader?modules!./~/sass-loader!./app/components/common/common.scss 361 bytes {0} [built]
webpack: bundle is now VALID.

scss更改后的输出样本。 

webpack: bundle is now INVALID.
Hash: f16b1beda9083db91735
Version: webpack 2.2.0
Time: 251ms
                               Asset       Size  Chunks                    Chunk Names
                           bundle.js     1.1 MB       0  [emitted]  [big]  main
0e873f689fcea2b7cee6.hot-update.json   35 bytes          [emitted]         
                     styles/main.css  626 bytes       0  [emitted]         main
chunk    {0} bundle.js, styles/main.css (main) 1.03 MB [entry] [rendered]
  [143] ./app/components/navbar/navbar.scss 181 bytes {0} [built]
     + 310 hidden modules
Child html-webpack-plugin for "index.html":
    chunk    {0} index.html 541 kB [entry]
         + 4 hidden modules
Child extract-text-webpack-plugin:
    chunk    {0} extract-text-webpack-plugin-output-filename 2.2 kB [entry] [rendered]
        [1] ./~/css-loader?modules!./~/sass-loader!./app/components/navbar/navbar.scss 694 bytes {0} [built]
         + 1 hidden modules
webpack: bundle is now VALID.

您可以看到main.css的大小已更改，但页面永远不会刷新，直到我按下f5

2 个答案:

答案 0 :(得分：3)

使用extract-text-webpack-plugin时使用css-hot-loader

可以更好地控制CSS HMR

下面是规则集合中的使用代码示例

{ test: /\.css$/, use: ['css-hot-loader'].concat(ExtractTextPlugin.extract({ fallback: 'style-loader', use: 'css-loader' })) }

答案 1 :(得分：2)

如extract-text-webpack-plugin的github主页中所述： 警告：“没有热模块替换”

开发时不应使用此插件，它仍然可用于创建生产版本。 您可以创建两个webpack配置文件，一个用于dev，另一个用于prod，这可能对两种情况都有帮助。

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