TypeError: Cannot read properties of undefined with node.js extend class

router.ts

import UserController from './controllers/UserController'
router.get( '/users', UserController.getAll);

Controller.ts

 class Controller {
    
     async _getAll() { 
         return {user: "test"}
     }
    
 }

export default Controller

UserController.ts

import { NextFunction, Request, Response } from "express"
import Controller from "./Controller";


class UserController extends Controller {
  
    async getAll (req: Request, res: Response, next: NextFunction) {
        const response = await this._getAll() 
        return res.status( 200 ).json( response )
    }

}

export default new UserController( );

My main question is i want to use get function other controllers extends from Controller.ts but getting this error:

TypeError: Cannot read properties of undefined (reading '_getAll') at /private/var/www/project/src/controllers/UserController.ts:8:37