ReactJS-是什么使bundle.js变得很大

时间:2019-07-08 03:48:32

标签: javascript reactjs webpack

我最近在ReactJS上完成了一个项目,该项目的唯一问题是其生产bundle.js大小约为 30MB ,这真是太庞大了。我已经使用BundleAnalyzerPlugin插件进行了分析,看起来像这样

enter image description here

块越大,大小越大。

node_modules = 10 MB 每个可见的小块几乎都 = 1MB

我的webpack配置如下

webpack.base.config.js

var webpack = require('webpack');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
module.exports = {
  entry: [
    './src/index.js'
  ],
  output: {
    path: __dirname,
    publicPath: '/',
    filename: 'bundle.js'
  },
  noParse:[
    './~/xlsx/jszip.js',
  ],
  externals:[
    {'./jszip': 'jszip'}
  ],
  module: {
    loaders: [{
      test: /\.js$/,
      exclude: /node_modules/,
      loader: 'babel',
      query: {
        presets: ['react', 'es2015', 'stage-1']
      }
    },
    {
      test: /\.json$/,
      loader: "json-loader"
    },
    {
      test: /\.(html)$/,
      loader: "html-loader",
      options:{
        attrs:[':data-src!./src/components/preview/preview_html',':data-src!./src/components/landing/loader/index.html']
      }
    },
    {
      test: /\.(ttf|gif|eot|svg|woff|woff2|png)(\?.+)?$/,
      loader: 'file-loader?name=[hash:12].[ext]'
    },
    {
      test: /\.css?$/,
      loader: 'style-loader!css-loader?modules&importLoaders=1&localIdentName=[name]__[local]___[hash:base64:5]'
    },
    {
      test: /\.scss?$/,
      loader: 'style-loader!css-loader!sass-loader'
    }]
  },
  resolve: {
    root: __dirname,
    alias:{
      //Have set of aliases
    },
    extensions: ['','.json', '.js', '.jsx','.ejs']
  },
  plugins: [
        new webpack.ProvidePlugin({
           $: "jquery",
           jQuery: "jquery"
       }),
       new BundleAnalyzerPlugin()
  ],
  devServer: {
    historyApiFallback: true,
    contentBase: './',
    watchContentBase: true,
  },
  devtool:'cheap-module-eval-source-map'
};

webpack.prod.config.js

const merge = require('webpack-merge');
const baseConfig = require('./webpack.base.config.js');
var webpack = require('webpack');
var CompressionPlugin = require('compression-webpack-plugin');

var HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = merge(baseConfig,{
  plugins: [
      new webpack.DefinePlugin({
        'process.env': {
          'NODE_ENV': JSON.stringify('production')
        }
      }),
       new HtmlWebpackPlugin({
          template:'index.ejs',
          hash: false,
          baseHref: 'xxxx',
          scripts: [
            {
              src: 'bundle.js',
              type: 'text/javascript'
            }
          ]
      })
  ]
});

我已经直接从node_modules中导入了少量CSS到 index.ejs 文件中,该文件如下所示:

<link rel="stylesheet" href="/node_modules/react-bootstrap-switch/dist/css/bootstrap3/react-bootstrap-switch.css">
    <link rel="stylesheet" href="/node_modules/draft-js/dist/Draft.css">
    <link rel="stylesheet" href="/node_modules/react-select-plus/dist/react-select-plus.css">
    <link rel="stylesheet" href="/node_modules/react-day-picker/lib/style.css">
    <link rel="stylesheet" href="/node_modules/react-draft-wysiwyg/dist/react-draft-wysiwyg.css">
    <script src="node_modules/xlsx/dist/shim.min.js"></script>
    <script src="node_modules/xlsx/dist/xlsx.full.min.js"></script>

需要帮助来减小尺寸,并发现配置或实现中的错误。

谢谢。

1 个答案:

答案 0 :(得分:1)

我假设您正在使用webpack4。我注意到您尚未在生产Webpack配置中设置mode: 'production'。该选项将进行优化,包括使用terser最小化捆绑输出。另外,将NODE_ENV设置为production,某些库直接依赖于该变量的值。

我建议从此开始,并阅读以下内容:https://webpack.js.org/guides/production/

完成此操作后,您可以开始确定在供应商捆绑包中占据最大容量的第三方模块。然后,您可以考虑对它们进行代码拆分,以便它们将位于各自独立的块中,并且仅在需要时才可以加载它们。您可以在这里阅读有关代码拆分的信息:https://webpack.js.org/guides/code-splitting/