webpack.config.ts

import { resolve } from 'path';
import { Configuration } from 'webpack';
import glob from 'glob';

const isProduction = process.env.NODE_ENV === 'production';
const mode = isProduction ? 'production' : 'development';
console.info(`Build type: ${mode}`);

type LambdaFolder = {
  path: string;
  name: string;
};

const expr = /\.\/src\/(.+)\/app.ts$/;
const paths: LambdaFolder[] = glob
  .sync('./src/**/app.ts')
  .map((path: string) => path.match(expr))
  .map((match: any) => ({ path: match[0], name: match[1] }));

console.log(paths);

const config: Configuration = {
  mode: mode,
  devtool: isProduction ? false : 'eval-source-map',
  entry: paths.reduce((acc: any, lambda) => {
    acc[lambda.name] = lambda.path;
    return acc;
  }, {}),
  externals: isProduction ? ['aws-sdk'] : [],
  output: {
    filename: '[name]/app.js',
    libraryTarget: 'commonjs2',
    path: resolve(__dirname, 'dist'),
    devtoolModuleFilenameTemplate: '[absolute-resource-path]',
  },
  module: {
    rules: [
      {
        test: /\.ts$/,
        loader: 'esbuild-loader',
        exclude: /node_modules/,
        options: { loader: 'ts', target: 'es2015' },
      },
    ],
  },
  resolve: {
    extensions: ['.js', '.ts'],
  },
  target: 'node',
  plugins: [
    function () {
      this.hooks.done.tap('BuildStatsPlugin', function () {
        console.log('>>> ' + new Date().toLocaleTimeString() + ' <<<');
      });
    },
  ],
};

export default config;