webpack.dev.js

const path = require('path');
const webpack = require('webpack');
const { merge } = require('webpack-merge');
const common = require('./webpack.common.js');
const packageJson = require('./package');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
// const ReactRefreshPlugin = require('@pmmmwh/react-refresh-webpack-plugin');

const port = 3000;
const host = 'localhost';

module.exports = merge(common, {
  mode: 'development',
  devtool: 'source-map',
  entry: { app: './src/app.tsx' },
  devServer: {
    static: {
      directory: path.join(__dirname, 'build'),
    },
    host: host,
    port: port,
    hot: true,
  },
  output: {
    path: path.resolve(__dirname, './build'),
    filename: '[name].js',
    publicPath: '/',
  },
  module: {
    rules: [
      {
        test: /\.([jt])s(x)?$/,
        exclude: /node_modules/,
        include: path.join(__dirname, 'src'),
        use: [
          {
            loader: 'ts-loader',
            options: { transpileOnly: true },
          },
        ].filter(Boolean),
      },
      {
        test: /\.s[ac]ss$/i,
        use: ['style-loader', 'css-loader', 'sass-loader'].filter(Boolean),
      },
    ],
  },
  plugins: [
    // new ReactRefreshPlugin(),
    new ForkTsCheckerWebpackPlugin(),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('development'),
    }),
    new HtmlWebpackPlugin({
      inject: true,
      filename: './index.html',
      template: __dirname + '/src/index.html',
    }),
  ],
});