webpack.config.js

var webpack = require('webpack'),
  path = require('path'),
  fileSystem = require('fs'),
  env = require('./utils/env'),
  CleanWebpackPlugin = require('clean-webpack-plugin').CleanWebpackPlugin,
  CopyWebpackPlugin = require('copy-webpack-plugin'),
  HtmlWebpackPlugin = require('html-webpack-plugin'),
  WriteFilePlugin = require('write-file-webpack-plugin');

// load the secrets
var alias = {};

var secretsPath = path.join(__dirname, 'secrets.' + env.NODE_ENV + '.js');

var fileExtensions = [
  'jpg',
  'jpeg',
  'png',
  'gif',
  'eot',
  'otf',
  'ttf',
  'woff',
  'woff2'
];

if (fileSystem.existsSync(secretsPath)) {
  alias['secrets'] = secretsPath;
}

var options = {
  mode: process.env.NODE_ENV || 'development',
  entry: {
    popup: path.join(__dirname, 'src', 'js', 'popup.js'),
    background: path.join(__dirname, 'src', 'js', 'background.js'),
    content: path.join(__dirname, 'src', 'js', 'content.js')
  },
  chromeExtensionBoilerplate: {
    notHotReload: ['content', 'background']
  },
  output: {
    path: path.join(__dirname, 'build'),
    filename: '[name].bundle.js'
  },
  module: {
    rules: [
      { test: /\.svg$/, loader: 'svg-inline-loader', exclude: /node_modules/ },
      {
        test: /\.css$/,
        loader: 'style-loader!css-loader',
        exclude: /node_modules/
      },
      {
        test: new RegExp('.(' + fileExtensions.join('|') + ')$'),
        loader: 'file-loader?name=[name].[ext]',
        exclude: /node_modules/
      },
      {
        test: /\.html$/,
        loader: 'html-loader',
        exclude: /node_modules/
      },
      {
        test: /\.(js|jsx)$/,
        loader: ['babel-loader', 'eslint-loader'],
        exclude: /node_modules/
      }
    ]
  },
  resolve: {
    alias: alias
  },
  plugins: [
    // clean the build folder
    new CleanWebpackPlugin({
      cleanAfterEveryBuildPatterns: ['!manifest.json']
    }),
    // expose and write the allowed env vars on the compiled bundle
    new webpack.EnvironmentPlugin({ NODE_ENV: 'development' }),
    new CopyWebpackPlugin([
      {
        from: 'src/manifest.json',
        transform: function (content, path) {
          // generates the manifest file using the package.json informations
          return Buffer.from(
            JSON.stringify({
              description: process.env.npm_package_description,
              version: process.env.npm_package_version,
              ...JSON.parse(content.toString())
            })
          );
        }
      }
    ]),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'popup.html'),
      filename: 'popup.html',
      chunks: ['popup']
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'background.html'),
      filename: 'background.html',
      chunks: ['background']
    }),
    new WriteFilePlugin()
  ]
};

if (env.NODE_ENV === 'development') {
  options.devtool = 'cheap-module-eval-source-map';
}

module.exports = options;