如何在TypeScript中扩展Error类

class CustomError extends Error {
  constructor(message: string) {
    super(message);
    this.name = 'CustomError';
  }
}

class CustomError extends Error {
  statusCode: number;

  constructor(message: string, statusCode: number) {
    super(message);
    this.name = 'CustomError';
    this.statusCode = statusCode;
  }

  getStatusCode(): number {
    return this.statusCode;
  }
}

function throwError() {
  throw new CustomError('Something went wrong.', 500);
}

try {
  throwError();
} catch (error) {
  if (error instanceof CustomError) {
    console.log('Custom error:', error.message);
    console.log('Status code:', error.getStatusCode());
  } else {
    console.log('Unknown error:', error.message);
  }
}