webpack.config.js

const path = require('path');
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
const nodeExternals = require('webpack-node-externals');

module.exports = {
  context: __dirname,
  entry: './src/index.ts',
  resolve: {
    extensions: ['.mjs', '.json', '.ts'],
    symlinks: false,
    cacheWithContext: false,
  },
  output: {
    libraryTarget: 'commonjs',
    path: path.join(__dirname, 'lib'),
    filename: '[name].js',
  },
  target: 'node',
  externals: [nodeExternals()],
  module: {
    rules: [
      {
        test: /\.ts?$/,
        loader: 'babel-loader',
        exclude: [
          [
            path.resolve(__dirname, 'node_modules'),
            path.resolve(__dirname, '.webpack'),
            path.resolve(__dirname, '.vscode'),
          ],
        ],
        options: {
          // disable type checker - we will use it in fork plugin
          transpileOnly: true,
        },
      },
    ],
  },
  plugins: [new ForkTsCheckerWebpackPlugin()],
};