使用webpack来验证反应束js

Question

我正在尝试使用下面的我的bundle js文件的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]'
        }
      }
    ]
  }
};

我得到以下错误的构建

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

Answer 1

我假设您正在使用最新版本6的npm query-sting软件包，该软件包使用ES6语法编写，显然您的webpack使用的UglifyJS版本不支持此语法（因为显然，您使用的是旧的Webpack版本？）。因此，您需要安装query-sting版本5.您可以在INSTALL section的README页面上看到此信息。

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