TODO: remove rxjs dependency

[Aetherall]

The following naive implementation makes the tests pass
saving it here cause I have to go sleep

class TimeoutError extends Error {}

function waitForAssertion(assertion: (() => any) | (() => Promise<any>), timeout = 1000, interval = 100): Promise<void> {
  return new Promise((resolve, reject) => {
    const clock = setInterval(async () => {
      try {
        await assertion()
        resolve();
      } catch(err){
        if(err instanceof ReferenceError || err instanceof TypeError){
          clearInterval(clock)
          reject(err);
        }
      }
      
    }, interval);

    setTimeout(() => {
      clearInterval(clock);
      reject(new TimeoutError());
    }, timeout);
  });
}