webpack2 压缩js

const webpack = require('webpack');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: __dirname + '/dist'
  },
  plugins: [
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false,
        drop_console: true, // 移除console语句
        drop_debugger: true // 移除debugger语句
      },
      output: {
        comments: false // 移除注释
      }
    })
  ]
};

const TerserPlugin = require('terser-webpack-plugin');

module.exports = {
  // ...其他配置
  optimization: {
    minimize: true,
    minimizer: [new TerserPlugin()]
  }
};

module.exports = {
  // ...其他配置
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'thread-loader',
            options: {
              workers: 2
            }
          },
          'babel-loader'
        ]
      }
    ]
  }
};