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Node.js V6.2.0 Class Extends Is Not A Function Error?

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So I'm trying to extend a class in node js and the compiler keeps returning the following error: TypeError: Class extends value # is not a function or null I checked

Solution 1:

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)


Solution 2:

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;
  }
}

Solution 3:

I had faced similar issue, after checking all the workaround finally issue got resolved by deleting the node_modules folder and run npm i.


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