无法使用Webpack 2.2.0和Webpack dev server 2.2.1进行HMR(热模块更换)css/sc

Question

版本

"提取文本webpack插件"："^2.0.0-rc.2"，

"webpack"："^2.2.0"，

"webpack开发服务器"："^2.2.1">

问题

"提取文本webpack插件"："^1.0.1"，

"webpack"："^1.14.0"，

"webpack开发服务器"："^1.16.2">

自从升级到版本2后，我再也无法使用HMR-css/scss了，更改样式会触发更改(请参阅下面的输出示例)，但我必须手动刷新页面以查看更改。页面不会自动刷新，如果我在更改scss文件后更改了js文件，则更改会反映为js更改触发HMR，其中也包括样式更改，但只有在不更改js的情况下更改样式才需要手动刷新页面。

如果我配置了错误的东西，或者我需要做什么才能让css/scss HMR工作，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但不确定是webpack开发服务器问题还是提取文本webpack插件问题，或者只是我做过的事情。

命令运行：

npm运行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({ 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.

scs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.

你可以看到main.css的大小发生了变化，但直到我按下f5 ，页面才刷新

Answer 1

在使用提取文本webpack插件时，为了更好地控制CSS HMR，请使用CSS热加载器

下面是我在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' })) }

Answer 2

如extract-text-webpack插件的github主页所述：注意事项："无热模块更换">

你不应该在开发时使用这个插件，它仍然对创建生产版本有用。您可以创建两个webpack配置文件，一个用于dev，另一个用于prod，这可能对这两种情况都有帮助。