webpack.config.js

const path = require('path')
const CopyWebpackPlugin = require('copy-webpack-plugin')

module.exports = {
  entry: {
    background: path.join(__dirname, 'src/background.ts'),
    popup: path.join(__dirname, 'src/popup.tsx'),
    content: path.join(__dirname, 'src/content.ts'),
    inject: path.join(__dirname, 'src/inject.ts')
  },
  output: {
    path: path.join(__dirname, 'build'),
    filename: '[name].js'
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'style-loader',
          { loader: 'css-loader', options: { importLoaders: 1 } },
          'postcss-loader'
        ],
        exclude: /node_modules/
      },
      {
        test: /\.tsx?$/,
        use: {
          loader: 'ts-loader',
          options: {
            transpileOnly: true
          }
        }
      },
      {
        test: /\.html$/,
        loader: 'html-loader',
        exclude: /node_modules/
      }
    ]
  },
  resolve: {
    extensions: ['.js', '.ts', '.tsx']
  },
  devtool: 'cheap-module-source-map',
  plugins: [
    new CopyWebpackPlugin({
      patterns: [{ from: './public' }]
    })
  ]
}