cypress/system-tests/projects/webpack-dev-server-ts/webpack.config.ts

export default {
  mode: 'development',
  devtool: 'inline-source-map',
  entry: './app.ts',
  output: {
    filename: 'bundle.js',
  },
  resolve: {
    // Add `.ts` and `.tsx` as a resolvable extension.
    extensions: ['.ts', '.tsx', '.js'],
    // Add support for TypeScripts fully qualified ESM imports.
    extensionAlias: {
      '.js': ['.js', '.ts'],
      '.cjs': ['.cjs', '.cts'],
      '.mjs': ['.mjs', '.mts'],
    },
  },
  module: {
    rules: [
      // all files with a `.ts`, `.cts`, `.mts` or `.tsx` extension will be handled by `ts-loader`
      { test: /\.([cm]?ts|tsx)$/, loader: 'ts-loader' },
    ],
  },
}