@jakesidsmith/tsb/src/webpack-callback.ts

Dead simple TypeScript bundler, watcher, dev server, transpiler, and polyfiller

import { Stats } from 'webpack';
import * as logger from './logger';

type WebpackCallback = (error?: Error | null, stats?: Stats) => void;

export const createWebpackCallback =
  (exit: boolean): WebpackCallback =>
  (error, stats) => {
    if (error) {
      logger.error(error);
    } else if (stats?.compilation.errors.length) {
      stats.compilation.errors.forEach((compilationError) => {
        logger.error(compilationError.message);
        logger.error(compilationError.file);
      });
    }

    if (error || stats?.compilation.errors.length) {
      logger.error('Failed to compile');

      if (exit) {
        return process.exit(1);
      }
    }

    if (
      typeof stats?.endTime !== 'undefined' &&
      typeof stats?.startTime !== 'undefined'
    ) {
      const time = ((stats.endTime - stats.startTime) / 1000).toFixed(2);

      logger.success(`Compiled in ${time} seconds`);
    }

    if (exit) {
      return process.exit(0);
    }

    return;
  };