webpack.config.development.js

const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')

const port = process.env.PORT || 3000

module.exports = {
  mode: 'development',
  // We put babel-polyfill first to support Next js features
  entry: ['babel-polyfill', './src/index.js'],
  output: {
    filename: 'bundle.[hash].js'
  },
  devtool: 'inline-source-map',

  module: {
    rules: [
      {
        test: /\.(js)$/,
        exclude: /node_modules/,
        use: ['babel-loader']
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: 'style-loader'
          },
          {
            loader: 'css-loader',
            options: {
              modules: true,
              camelCase: true,
              sourcemap: true
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'public/index.html'
    })
  ],
  devServer: {
    host: 'localhost',
    port: port,
    historyApiFallback: true,
    open: false
  }
}