webpack.dev.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const {
  PUBLIC_PATH = '/',
  API_HOST = 'http://localhost:8080',
  NODE_ENV = 'development'
} = process.env;

module.exports = {
  target: 'web',

  entry: './src/index.tsx',
  output: {
    path: path.resolve(__dirname, 'build'),
    publicPath: PUBLIC_PATH,
    filename: 'static/bundle.js',
    chunkFilename: 'static/js/[name].chunk.js'
  },

  optimization: {
    splitChunks: { chunks: 'all' },
    noEmitOnErrors: true
  },

  watch: true,
  devtool: 'source-map',
  mode: 'development',

  devServer: {
    contentBase: path.resolve(__dirname, 'public'),
    publicPath: PUBLIC_PATH,
    port: 3000,
    inline: true,
    hotOnly: true,
    host: '0.0.0.0',
    proxy: {
      '/api': API_HOST
    },
    historyApiFallback: {
      index: PUBLIC_PATH
    }
  },

  resolve: {
    extensions: ['.ts', '.tsx', '.js', '.css', '.scss'],
    modules: ['src', 'node_modules']
  },
  module: {
    rules: [
      {
        test: /\.(jsx?|tsx?)$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.(sa|sc|c)ss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              publicPath: PUBLIC_PATH,
              hmr: true
            }
          },
          {
            loader: 'css-loader',
            options: {
              modules: { localIdentName: '[name]--[local]--[hash:base64:5]' },
              sourceMap: true
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      inject: true,
      template: path.resolve(__dirname, 'public/index.html')
    }),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css'
    }),
    new webpack.DefinePlugin({
      'process.env': JSON.stringify({ NODE_ENV, API_HOST, PUBLIC_PATH })
    }),
    new webpack.NamedModulesPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ]
};