如何在开发模式下减少webpack bundle?

时间:2017-03-25 17:39:41

标签: reactjs webpack react-dom

我正在尝试为react / redux项目创建自己的webpack配置。配置似乎工作得很好,但是捆绑包大小很大(在开发模式下,我知道如何在生产模式下减少它)

我的package.json看起来像

  "dependencies": {
    "react": "15.4.2",
    "react-dom": "15.4.2",
    "react-hot-loader": "3.0.0-beta.6"
  },
  "devDependencies": {
    "babel-core": "6.24.0",
    "babel-loader": "6.4.1",
    "babel-preset-react": "6.23.0",
    "commitizen": "2.9.6",
    "cz-conventional-changelog": "2.0.0",
    "html-webpack-plugin": "2.28.0",
    "webpack": "2.3.1",
    "webpack-bundle-analyzer": "^2.3.1",
    "webpack-dev-server": "2.4.2"
  }

我的webpack配置看起来像

const webpack = require('webpack');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const HtmlWebpackPlugin = require('html-webpack-plugin');

const project = require('./project.config')

const __DEV__ = project.globals.__DEV__;
const __PROD__ = project.globals.__PROD__;
const __TEST__ = project.globals.__TEST__;

const APP_ENTRIES = [project.paths.client('index.js')];

if (__DEV__) {
  APP_ENTRIES.unshift(
    'react-hot-loader/patch',
    `webpack-dev-server/client?http://${project.server_host}:${project.server_port}`,
    'webpack/hot/only-dev-server'
  )
}

const config = {
  devtool: project.compiler_devtool,

  entry: APP_ENTRIES,

  output: {
    path: project.paths.dist(),
    filename: `[name].[${project.compiler_hash_type}].js`,
    publicPath: project.compiler_public_path,
  },

  resolve: {
    modules: [
      project.paths.client(),
      'node_modules',
    ],
  },

  module: {
    rules: [{
      test: /\.js?$/,
      loader: 'babel-loader',
      exclude: /node_modules/,
    }],
  },

  plugins: [
    new BundleAnalyzerPlugin(),
    new HtmlWebpackPlugin({
      template: project.paths.client('index.html'),
      hash: false,
      filename: 'index.html',
      inject: 'body',
    }),
  ],

  node: {
    fs: 'empty',
    net: 'empty',
    tls: 'empty'
  }
}

if (__DEV__) {
  config.plugins.push(
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin());
}

module.exports = config

现在,当我运行webpack-dev-server

时,我得到了这个输出

Webpack-dev-server output

正如您所看到的,我的捆绑包大于1.3 Mb,但我只使用了一些库。

我尝试使用webpack-bundle-analyser找出我的捆绑包为何如此之大。结果如下

Webpack-bundle-analyser result

似乎reactreadct-dom是最大的图书馆。

有没有办法在开发模式下缩小捆绑包的大小?我做错了吗?

PS:我在compress = true选项中设置webpack-dev-server,但它没有减少捆绑包的大小。

以下是有关我如何使用webpack-dev-server

的详细信息

bin / start.js (我使用node bin/start.js运行)

const webpack = require('webpack');
const WebpackDevServer = require('webpack-dev-server');

const config = require('../config/webpack.config');
const project = require('../config/project.config');

function runDevServer() {
  const devServer = new WebpackDevServer(webpack(config), {
    compress: true,
    hot: true,
    publicPath: project.compiler_public_path,
    stats: project.compiler_stats,
    watchOptions: {
      ignored: /node_modules/
    },
  });

  // Launch WebpackDevServer.
  devServer.listen(project.server_port, project.server_host, (err) => {
    if (err) {
      console.log('Webpack dev server encountered an error', err);
      return reject(err);
    }
    console.log(`Listening at ${project.server_host}:${project.server_port}`);
  });
}

runDevServer()

src / index.js (我的应用程序。Home只是一个返回的组件" Hello world")

import React from 'react';
import ReactDOM from 'react-dom';

import { AppContainer } from 'react-hot-loader';

import Home from './routes';

const render = () => {
  try {
    ReactDOM.render(
      <AppContainer>
        <Home />
      </AppContainer>,
      document.getElementById('root')
    );
  } catch (err) {
    console.error(err)
  }
};

if (module.hot) {
  module.hot.accept('./routes', () => render());
}

render()

1 个答案:

答案 0 :(得分:3)

在开发过程中使用大型捆绑包是正常的,1.3MB仍然很小,通常应该快速加载。由于您使用的是webpack-dev-server,因此每次更改后都应该重新加载。如果你使用compress = true,你的包大小将是相同的,除了当客户端要求它时它将被gzip压缩(你应该在网络选项卡中看到gzip)。我建议你不要尝试减少开发包的大小,因为它很难调试,刷新也慢。如果你真的想减小尺寸,你可以只修改和缩小库代码。这是一种非常常见的方法,您基本上将每个库都放在一个名为vendor.js的文件中,您将缩小,uglify等。在另一个文件中bundle.js,您将获得所有代码。我写道。这将显着减少总尺寸。但你必须加载2个js文件。你也可以为webpack 2激活树摇动。她是关于tree shaking的更多信息。您可以参考this answer了解如何单独捆绑供应商脚本,并阅读有关code splitting here的更多信息。但请记住,dev开发包的大小总是更大,因为它在调试时非常方便。