function deleteChild(returnFiber: Fiber, childToDelete: Fiber): void {
    if (!shouldTrackSideEffects) {
      
      return;
    }
    
    
    
    
    
    const last = returnFiber.lastEffect;
    if (last !== null) {
      last.nextEffect = childToDelete;
      returnFiber.lastEffect = childToDelete;
    } else {
      returnFiber.firstEffect = returnFiber.lastEffect = childToDelete;
    }
    childToDelete.nextEffect = null;
    childToDelete.effectTag = Deletion;
  }
  function deleteRemainingChildren(