webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const sveltePreprocess = require('svelte-preprocess');

const mode = process.env.NODE_ENV || 'development';
const prod = mode === 'production';

module.exports = {
  entry: {
    app: ['./src/main.ts'],
  },
  resolve: {
    alias: {
      svelte: path.resolve('node_modules', 'svelte'),
    },
    extensions: ['.tsx', '.ts', '.mjs', '.js', '.svelte'],
    mainFields: ['svelte', 'browser', 'module', 'main'],
  },
  output: {
    path: `${__dirname}/public/build`,
    filename: '[name].js',
    chunkFilename: '[name].[id].js',
  },
  mode,
  devtool: prod ? false : 'source-map',
  devServer: {
    contentBase: './public',
    publicPath: '/build',
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: 'ts-loader',
      },
      {
        test: /\.svelte$/,
        use: {
          loader: 'svelte-loader',
          options: {
            emitCss: true,
            hotReload: true,
            preprocess: sveltePreprocess(),
          },
        },
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader'],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].css',
    }),
  ],
};