typescript - 如何在 TypeScript 中扩展 Error 类

Question

有没有办法在 TypeScript >= 3.3 中扩展 Error 以便它可以正确地与 instanceof 一起工作？

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，你必须添加魔法线

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
}