Question

有没有一种方法可以在TypeScript> = 3.3中扩展Error，使其可以与instanceof一起正常工作？

class MyError extends Error {
  constructor(
                    message: string,
    public readonly details: string
  ) { super(message) }
}

try {
  throw new MyError('some message', 'some details')
} catch (e) {
  console.log(e.message)            // Ok
  console.log(e.details)            // Ok
  console.log(e instanceof MyError) // Wrong, prints false
}

Answer 1

感谢@moronator，您必须添加魔术线

class MyError extends Error {
  constructor(
                    message: string,
    public readonly details: string
  ) { 
    super(message) 

    // This line
    Object.setPrototypeOf(this, MyError.prototype)
  }
}

try {
  throw new MyError('some message', 'some details')
} catch (e) {
  console.log(e.message)            // Ok
  console.log(e.details)            // Ok
  console.log(e instanceof MyError) // Works
}

如何在TypeScript中扩展Error类

1 个答案: