Webpack - 错误:无法在加载器列表中定义"查询"和多个加载器

Question

在数组中添加'react-hot'加载器后出现错误.我已经按照这个教程:https://robots.thoughtbot.com/setting-up-webpack-for-react-and-hot-module-replacement但是,我得到了react-hot.

var WebpackDevServer = require("webpack-dev-server");
var webpack = require('webpack');
var path = require('path');
require("babel-polyfill");

var BUILD_DIR = path.resolve(__dirname, 'build');
var APP_DIR = path.resolve(__dirname, 'src');

module.exports = {
  entry: [
    'babel-polyfill',
    'bootstrap-loader',
    'webpack/hot/dev-server',
    APP_DIR + '/import.js',
  ],
  output: {
    path: BUILD_DIR,
    filename: 'bundle.js'
  },
  module: {
    loaders: [{
      test: /\.jsx?$/,
      loaders: ['react-hot', 'babel'],
      exclude: /node_modules/,
      query: {
        plugins: ['transform-runtime'],
        presets: ['es2015', 'stage-0', 'react']
      }
    }, {
      test: /\.css$/,
      loader: "style-loader!css-loader"
    }, {
      test: /\.scss$/,
      loaders: ["style", "css", "sass"]
    }, {
      test: /\.(png|woff|woff2|eot|ttf|svg|jpg|gif)$/,
      loader: 'url-loader?limit=100000'
    }]
  },
  plugins: [
    new webpack.ProvidePlugin({
      $: "jquery",
      jQuery: "jquery"
    }),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoErrorsPlugin()
  ]
};

Answer 1

看起来查询是一种自定义单个加载器行为的替代方法,比内联指定这些参数更简洁(见下文).如果存在多个加载器,则Webpack不知道该query配置适用于哪个.

以下应解决您的问题:

module: {
    loaders: [{
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loaders: ['react-hot', 'babel?presets[]=es2015,presets[]=stage-0,presets[]=react,plugins[]=transform-runtime']
    }

编辑:虽然此解决方案适用于Webpack 1,但请参阅其他答案,了解适用于更新版本的更清洁解决方案.

Answer 2

我的解决方案

loaders: [{
  test: /\.(js|jsx)$/,
  loaders: ['react-hot', 'babel?' + JSON.stringify({
    cacheDirectory: true,
    plugins: [
      'transform-runtime',
      'transform-decorators-legacy'
    ],
    presets: ['es2015', 'react', 'stage-0'],
    env: {
      production: {
        presets: ['react-optimize']
      }
    }
  }), 'eslint'],
  include: src,
  exclude: /node_modules/
}

Answer 3

在webpack 2和3中,这可以更加干净地配置.

加载器可以在一组加载器对象中传递.每个加载器对象可以指定一个options对象,该对象的行为类似于该query特定加载器的webpack 1 .

例如,同时使用react-hot-loader和babel-loader,与babel-loader配置有一些选项,在的WebPack三分之二

module: {
  rules: [{
    test: /\.js$/,
    exclude: /node_modules/,
    use: [{
      loader: 'react-hot-loader'
    }, {
      loader: 'babel-loader',
      options: {
        babelrc: false,
        presets: [
          'es2015-native-modules'
          'stage-0',
          'react'
        ]
      }
    }]
  }] 
}

为了比较,这里使用查询字符串方法在webpack 1中使用相同的配置.

module: {
  rules: [{
    test: /\.js$/,
    exclude: /node_modules/,
    loaders: [
      'react-hot',
      'babel-loader?' +
        'babelrc=false,' +
        'presets[]=es2015,' +
        'presets[]=stage-0,' +
        'presets[]=react'
      ]
  }] 
}

注意链中所有已更改的属性名称.

另请注意,我已将es2015预设更改es2015-native-modules为babel-loader配置中的预设.这与规范无关options,只是包括es6模块允许你使用v2中引入的webpack树抖动功能.它可以保持独立,它仍然可以工作,但如果没有指出明显的升级,答案会感觉不完整:-)

免责声明:这与我对类似问题的回答相同,但这个问题有类似的投票/观点/谷歌排名,所以我也会在这里发布答案.