Extending Error with ES6 Class

Question

I'm unable to run any of the methods on this MyError class.

class MyError extends Error {
  constructor(message) {
    super()
    this.name = 'MyError'
    this.message = message
    this.stack = (new Error(message)).stack
    return this
  }
  doSomething () {
    return this.message + " dolphin"
  }
}

let myError = new MyError('Invalid Form.')

console.log(myError.doSomething())

For some reason this is giving me an error:

console.log(myError.doSomething());
                    ^

TypeError: myError.doSomething is not a function

There may be some insight here http://stackoverflow.com/a/32750746/340688 — ThomasReggi, Apr 01 '16 at 18:39
Where are you executing this? Extending builtins really works only in real ES6 environments — Bergi, Apr 03 '16 at 16:43

score 0 · Accepted Answer · answered Apr 01 '16 at 18:46

Found out you can't extend Error.

There's a package es6-error with an Error that you can extend.

import ExtendableError from 'es6-error';

class MyError extends ExtendableError {
  constructor(message) {
    super()
    this.name = 'MyError'
    this.message = message
    this.stack = (new Error(message)).stack
    return this
  }
  doSomething () {
    return this.message + " dolphin"
  }
}

let myError = new MyError('Invalid Form.')

console.log(myError.doSomething())

Might be worth including the reason why (Babel) in your answer with the link from your comment to make it explicit. — Andy, Apr 01 '16 at 18:49

Extending Error with ES6 Class

1 Answers1