使用Typescript处理Express类中的错误

import express, { Request, Response, NextFunction } from 'express';

class App {
  private app: express.Application;

  constructor() {
    this.app = express();
    this.setupMiddlewares();
    this.setupRoutes();
    this.setupErrorHandlers();
  }

  private setupMiddlewares(): void {
    // 添加中间件
    this.app.use(express.json());
    this.app.use(express.urlencoded({ extended: true }));
  }

  private setupRoutes(): void {
    // 添加路由
    this.app.get('/', (req: Request, res: Response) => {
      throw new Error('Something went wrong');
    });
  }

  private setupErrorHandlers(): void {
    // 错误处理中间件
    this.app.use((err: Error, req: Request, res: Response, next: NextFunction) => {
      console.error(err);
      res.status(500).json({ error: 'Internal Server Error' });
    });
  }

  public start(): void {
    this.app.listen(3000, () => {
      console.log('Server is running on port 3000');
    });
  }
}

const app = new App();
app.start();