IVy schedule tick

ivy-schedule-tick.ts

export function scheduleTick<T>(rootContext: RootContext) {
  if (rootContext.clean == _CLEAN_PROMISE) {
    let res: null|((val: null) => void);
    rootContext.clean = new Promise<null>((r) => res = r);
    rootContext.scheduler(() => {
      tick(rootContext.component);
      res !(null);
      rootContext.clean = _CLEAN_PROMISE;
    });
  }
}