webpack.config.js

const path = require('path')
const webpack = require('webpack')
// const ExtractTextPlugin = require('extract-text-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const CleanWebpackPlugin = require('clean-webpack-plugin')

module.exports = {
  devtool: 'cheap-module-source-map',
  entry: {
    popup: './src/popup.js'
  },
  // Extension will be built into ./dist folder, which we can then load as unpacked extension in Chrome
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name].bundle.js'
  },
  // Here we define loaders for different file types
  module: {
    rules: [
      {
        test: /\.js$/,
        include: [
          path.resolve(__dirname, './src')
        ],
        use: 'babel-loader'
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      },
      // {
      //   test: /\.css$/,
      //   loader: ExtractTextPlugin.extract({
      //     fallback: 'style-loader',
      //     use: 'css-loader'
      //   })
      // },
      {
        test: /\.(ico|eot|otf|webp|ttf|woff|woff2)(\?.*)?$/,
        use: 'file-loader?limit=100000'
      },
      // {
      //   test: /\.(jpe?g|png|gif|svg)$/i,
      //   use: [
      //     'file-loader?limit=100000',
      //     {
      //       loader: 'img-loader',
      //       options: {
      //         enabled: true,
      //         optipng: true
      //       }
      //     }
      //   ]
      // }
    ]
  },
  plugins: [
    new CleanWebpackPlugin('dist'),
    // create popup.html from template and inject styles and script bundles
    new HtmlWebpackPlugin({
      inject: true,
      chunks: ['popup'],
      filename: 'popup.html',
      template: './src/popup.html',
      minify: {
        collapseWhitespace: true,
        collapseInlineTagWhitespace: true,
        removeComments: true,
        removeRedundantAttributes: true
      }
    }),
    // copy extension manifest and icons
    new CopyWebpackPlugin([
      { from: './src/manifest.json' },
      { context: './src/assets', from: '**/*', to: 'assets' },
      { context: './src/_locales', from: '**/*', to: '_locales' }
    ]),




    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production')
    }),
    new webpack.optimize.ModuleConcatenationPlugin(),
    // new webpack.optimize.UglifyJsPlugin({
    //   compress: {
    //     warnings: false,
    //     screw_ie8: true,
    //     conditionals: true,
    //     unused: true,
    //     comparisons: true,
    //     sequences: true,
    //     dead_code: true,
    //     evaluate: true,
    //     if_return: true,
    //     join_vars: true
    //   },
    //   output: {
    //     comments: false
    //   }
    // }),
    // new webpack.HashedModuleIdsPlugin()
  ]
}