webpack.config.js

const path = require('path')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')

module.exports = (env, argv) => ({
  mode: argv.mode === 'production' ? 'production' : 'development',
  entry: './src/js/index.js',
  output: {
    filename:
      argv.mode === 'production' ? 'build/bundle.min.js' : 'build/bundle.js',
    path: path.resolve(__dirname, 'public')
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      },
      {
        test: /\.css$/,
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader']
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[name].[ext]',
              outputPath: 'assets/fonts/'
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin({
      cleanOnceBeforeBuildPatterns: [
        '**/*',
        '!assets',
        '!assets/**/*',
        '!index.html',
        '!layout/**/*',
        '!layout',
        '!manifest.json',
        '!build/**/*',
        '!build',
        '!service-worker.js'
      ]
    })
  ],
  devServer: {
    static: path.join(__dirname, 'public'),
    compress: true,
    port: 7000
  }
})