My code works with all the other modules but JBehaviour is giving me this problem and idk what im doing wrong because it seems like I did everything right

Full Error:
Uncaught TypeError: Class extends value # is not a constructor or null
at Object. (C:UserseternDocumentsGameEnginesrcengineclassesJBehaviour.js:3)
at Object. (C:UserseternDocumentsGameEnginesrcengineclassesJBehaviour.js:11)

test_game.js

const {Vector2, GameObject, Rigidbody2d, JBehaviour, Input} = require('./Core')

Core.js

//Structs

const Vector2 = require('./structs/Vector2')



//Classes

const GameObject = require('./classes/GameObject')

const Rigidbody2d = require('./classes/Rigidbody2d')

const JBehaviour = require('./classes/JBehaviour')

const Input = require('./classes/Input')





module.exports = {Vector2, GameObject, Rigidbody2d, JBehaviour, Input}

JBehaviour.js

    const Behaviour = require('./Behaviour')



class JBehaviour extends Behaviour{

    constructor(){

        super('JBehaviour')

    }

}





module.exports = JBehaviour

Behaviour.js

const Component = require('./Component')



class Behaviour extends Component{

    constructor(name){

        super(name)

        this.enabled = true

    }

}

Component.js

const OBJ = require('./Object')

class Component extends OBJ {

    constructor(name){

        super(name)

        this.gameObject = null

        this.tag = null

        this.transform = null

    }



    AssignGameObject(gameObject){

        this.gameObject = gameObject

        this.tag = gameObject.tag

        this.transform = gameObject.transform

    }



    CompareTag(tag){



        return (this.tag === tag)

    }

}



module.exports = Component

Object.js

class OBJ{

    constructor(name){

        this.name = name

    }



    static Destroy(object){

        delete object.name

    }



    static Instantiate(original){



        return new OBJ(original.name)

    }



    ToString(){



        return toString(this.name)

    }

}



module.exports = OBJ