webpack.config.js

// eslint-disable-next-line @typescript-eslint/no-var-requires
var nodeExternals = require('webpack-node-externals');

module.exports = (env) => {
  /* eslint-disable @typescript-eslint/no-var-requires */
  const fs = require('fs');
  const path = require('path');

  const RELEASE = env.release;

  const nodeModules = {};
  fs.readdirSync('./node_modules')
    .filter((x) => ['.bin', 'common'].indexOf(x) === -1)
    .forEach((mod) => (nodeModules[mod] = `commonjs ${mod}`));

  return {
    target: 'node',
    mode: RELEASE ? 'production' : 'development',
    entry: './src/index.ts',
    devtool: 'inline-source-map',
    module: {
      rules: [
        {
          test: /\.tsx?$/,
          use: 'ts-loader',
          exclude: /node_modules/,
        }
      ],
    },
    resolve: {
      extensions: ['.js', '.ts'],
    },
    externals: [nodeExternals()],
    output: {
      filename: 'index.js',
      path: path.join(__dirname, 'build'),
    },

    plugins: [
      // fix for moment bundle size issues on include locale
    ],
  };
};