Uncaught Error: [HMR] Hot Module Replacement is disabled

Question

我正在使用 webpack 进行构建，使用 webpack-dev-server (npm run watch) 可以正常工作，但是当我尝试创建生产构建时 (npm run build) 当我尝试加载网站并且屏幕上什么也没有显示时，我似乎在控制台中收到错误消息。

Uncaught Error: [HMR] Hot Module Replacement is disabled.

我对此有几个问题：

我对使用 Hot Module Replacement 的理解是，它旨在让开发过程中的生活更轻松，不应在生产部署中使用。对吗？
鉴于以下，为什么要使用 Hot Module Replacement？我不明白是什么在驱动它。
关于生产构建的最佳实践是什么，我是否应该为生产和开发设置单独的 webpack 配置？理想情况下，我希望纯粹使用单个配置来简化维护。

package.json

{
  // ...
  "scripts": {
    "build": "webpack --progress --colors --production",
    "watch": "webpack-dev-server --inline --hot --progress --colors"
  },
  "dependencies": {
    "bootstrap": "^3.3.6",
    "bootstrap-sass": "^3.3.6",
    "bootstrap-webpack": "0.0.5",
    "extract-text-webpack-plugin": "^1.0.1",
    "html-webpack-plugin": "^2.15.0",
    "jquery": "^2.2.3",
    "node-sass": "^3.4.2",
    "react": "^15.0.1",
    "react-bootstrap": "^0.28.5",
    "react-dom": "^15.0.1",
    "react-redux": "^4.4.1",
    "react-router": "^2.0.1",
    "react-router-redux": "^4.0.1",
    "redux": "^3.3.1",
    "redux-thunk": "^2.0.1",
    "webpack": "^1.12.14"
  },
  "devDependencies": {
    "babel-core": "^6.7.4",
    "babel-loader": "^6.2.4",
    "babel-preset-es2015": "^6.6.0",
    "babel-preset-react": "^6.5.0",
    "css-loader": "^0.23.1",
    "exports-loader": "^0.6.3",
    "file-loader": "^0.8.5",
    "imports-loader": "^0.6.5",
    "less": "^2.6.1",
    "less-loader": "^2.2.3",
    "redux-devtools": "^3.2.0",
    "redux-logger": "^2.6.1",
    "sass-loader": "^3.2.0",
    "style-loader": "^0.13.1",
    "url-loader": "^0.5.7",
    "webpack-dev-server": "^1.14.1"
  }
}

webpack.config.js

var webpack = require('webpack');
var htmlWebpackPlugin = require('html-webpack-plugin');
var path = require('path');

module.exports = {
    entry: [
        'webpack/hot/only-dev-server',
        path.resolve(__dirname, 'app/index.js')
    ],
    output: {
        path: path.resolve(__dirname, 'public'),
        filename: 'bundle.js'
    },
    module: {
        loaders: [
            { test: /\.jsx?$/, exclude: /node_modules/, loader: 'babel', query: { presets: [ 'es2015', 'react' ] } },
            { test: /\.scss$/, loader: 'style!css!sass?includePaths[]=' + path.resolve(__dirname, './node_modules/bootstrap-sass/assets/stylesheets/') },
            { test: /\.(ttf|eot|svg|woff(2)?)(\?[a-z0-9]+)?$/, loader: 'file' }
        ]
    },
    resolve: {
        modulesDirectories: ['node_modules']
    },
    plugins: [
        new webpack.NoErrorsPlugin(),
        new htmlWebpackPlugin({
            filename: 'index.html',
            template: './index.html',
            inject: false
        }),
        new webpack.ProvidePlugin({
            $: "jquery",
            jQuery: "jquery"
        }),
        new webpack.optimize.OccurenceOrderPlugin()
    ]
};

Answer 1

在生产构建中包含热加载位并不是一个特别好的主意。它们在那里几乎毫无用处，只会膨胀你的文件大小。

有多种策略可以解决这个问题。有些人将他们的 webpack 配置按文件分开，然后通过 --config 指向它。我更喜欢通过 npm 维护单个文件和分支。我使用 webpack-merge 在分支之间共享配置（免责声明：我是作者）。

Answer 2

您需要启用 HMR 插件。将 HotModuleReplacementPlugin 添加到你 webpack.config 中的插件数组中。您可以为开发和生产设置单独的 webpack.config。

类似于

 plugins: [
    new webpack.NoErrorsPlugin(),
    new htmlWebpackPlugin({
        filename: 'index.html',
        template: './index.html',
        inject: false
    }),
    new webpack.ProvidePlugin({
        $: "jquery",
        jQuery: "jquery"
    }),
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.HotModuleReplacementPlugin()
]

Answer 3

我收到这个错误是因为我在 webpack.config.js 中有这样的代码。

devServer: {
    ...
    hot: true,
    inline: true
}

改为使用命令 webpack-dev-server --hot --inline，然后我就不必使用 new webpack.HotModuleReplacementPlugin() 来膨胀我的配置了。

https://github.com/webpack/webpack/issues/1151#issuecomment-111972680

Answer 4

您需要启用热模块更换功能才能使其正常工作，例如：

webpack.config.js

module.exports = {
  //...
  devServer: {
    hot: true
  },
  plugins: [
    //...
    new webpack.HotModuleReplacementPlugin()
  ]

};

来自网络包： Note that webpack.HotModuleReplacementPlugin is required to fully enable HMR. If webpack or webpack-dev-server are launched with the --hot option, this plugin will be added automatically, so you may not need to add this to your webpack.config.js. See the HMR concepts page for more information.

如上所述，否则您可以通过 package.json 启用它，将 --hot 添加到您的脚本中，例如

"start": "webpack-dev-server --hot",

Uncaught Error: [HMR] Hot Module Replacement is disabled

Uncaught Error: [HMR] Hot Module Replacement is disabled

javascript

node.js

webpack

hot-module-replacement