Node.js v6.2.0 class extends is not a function error?

Answer 1

In my instance, it was the same issue as @James111 was experiencing (circular import) due to a factory pattern I was trying to set up in Typescript. My fix was to do move the code into files, similar to the following:

// ./src/interface.ts
import { ConcreteClass } from './concrete';

export interface BaseInterface {
   someFunction(): any;
}

export class Factory {
  static build(): BaseInterface {
     return new ConcreteClass();
  }
}

// ./src/base.ts
import { BaseInterface } from './interface';
class BaseClass implements BaseInterface {
  someFunction(): any {
    return true;
  }
}

// ./src/concrete.ts
import { BaseClass } from './base';
export class ConcreteClass extends BaseClass {
  someFunction(): any {
    return false;
  }
}

Answer 2

So it turns out I had a circular reference in my code, where I was importing the class that was extending, into the class that itself was extending (tongue twister :P).

The obvious fix was to simply remove the extends reference and find another way of doing what I was trying to achieve. In my case it was passing the Venue class properties down into the VenueViews constructor.

E.g var x = VenueViews(this)