Extending Error in Javascript with ES6 syntax & Babel

Question

I am trying to extend Error with ES6 and Babel. It isn\'t working out.

class MyError extends Error {
  constructor(m) {
    super(m);
  }
}

var error = new          


        

Answer 1

Edit: Breaking changes in Typescript 2.1

Extending built-ins like Error, Array, and Map may no longer work.

As a recommendation, you can manually adjust the prototype immediately after any super(...) calls.

Editing Lee Benson original answer a little bit works for me. This also adds stack and additional methods of ExtendableError class to the instance.

class ExtendableError extends Error {
   constructor(message) {
       super(message);
       Object.setPrototypeOf(this, ExtendableError.prototype);
       this.name = this.constructor.name;
   }
   
   dump() {
       return { message: this.message, stack: this.stack }
   }
 }    

class MyError extends ExtendableError {
    constructor(message) {
        super(message);
        Object.setPrototypeOf(this, MyError.prototype);
    }
}

var myerror = new MyError("ll");
console.log(myerror.message);
console.log(myerror.dump());
console.log(myerror instanceof Error);
console.log(myerror.name);
console.log(myerror.stack);