Promisify Observable with callback function

shuttlecock.ts

import { Observable, of } from "rxjs";

export const promisify = <T>(obser: Observable<T>): Promise<T> => {
    return obser.toPromise();
};

function something(func: (...args) => Promise<void>): any {
  return func({cockIt: promisify});
}

function check(): Promise<void> {
   return something(async ({cockIt}) => {
    const lol = await cockIt(of(33));
    // tslint:disable-next-line:no-console
    console.log(lol);
   });
}

check();