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reactjs - 使用 webpack 丑化 react bundle js

问题描述

我正在尝试使用以下方法对我的 bundle js 文件进行 Uglify

import webpack from 'webpack';
import path from 'path';
import ExtractTextPlugin from 'extract-text-webpack-plugin';

const GLOBALS = {
  'process.env.NODE_ENV': JSON.stringify('production'), //This global makes sure React is built in prod mode. https://facebook.github.io/react/downloads.html
  __DEV__: false // potentially useful for feature flags. More info: https://github.com/petehunt/webpack-howto#6-feature-flags
};

export default {
  debug: true,
  devtool: 'source-map', // more info:https://webpack.github.io/docs/build-performance.html#sourcemaps and https://webpack.github.io/docs/configuration.html#devtool
  noInfo: true, // set to false to see a list of every file being bundled.
  entry: './src/index',
  target: 'web',
  output: {
    path: __dirname + '/dist', // Note: Physical files are only output by the production build task `npm run build`.
    publicPath: '/',
    filename: 'bundle.js'
  },
  devServer: {
    contentBase: './dist'
  },
  plugins: [
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.DefinePlugin(GLOBALS),
    new ExtractTextPlugin('styles.css'),
    new webpack.optimize.DedupePlugin(),
    new webpack.optimize.UglifyJsPlugin({
      uglifyOptions:{
        output: {
          comments: false, // remove comments
        },
        compress: {
          unused: true,
          dead_code: true, // big one--strip code that will never execute
          warnings: false, // good for prod apps so users can't peek behind curtain
          drop_debugger: true,
          conditionals: true,
          evaluate: true,
          drop_console: true, // strips console statements
          sequences: true,
          booleans: true,
        }
      },
    })
  ],
  module: {
    loaders: [
      {test: /\.js$/, include: path.join(__dirname, 'src'), loaders: ['babel']},
      {test: /(\.css)$/, loaders: ['style', 'css']},
      {test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: 'file'},
      {test: /\.(woff|woff2)$/, loader: 'url?prefix=font/&limit=5000'},
      {test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: 'url?limit=10000&mimetype=application/octet-stream'},
      {test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: 'url?limit=10000&mimetype=image/svg+xml'},
      {
        test: /\.json$/,
        loader: 'json-loader'
      },
      {
        test: /\.(png|jpg|gif)$/,
        loader: 'file-loader',
        options: {
          name: '[path][name].[ext]'
        }
      }
    ]
  }
};

我在构建构建时遇到以下错误

ERROR in bundle.js from UglifyJs
SyntaxError: Unexpected token: operator (>) [./~/query-string/index.js:9,0]

标签： reactjswebpack-4

解决方案

我假设您使用query-sting的是最新版本 6 的 npm 包，它是使用 ES6 语法编写的，显然您的 webpack 使用的 UglifyJS 版本不支持这种语法（因为显然，您使用的是旧的 Webpack 版本？）。因此，您需要安装query-sting第 5 版。您可以在他们的 README 页面的INSTALL 部分中查看此信息。

但是你使用哪个 webpack 版本？因为如果你使用的是最新的 Webpack 4，你应该使用optimization.minimize支持 ES6+ 语法的 config。

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