didact-fiber.js

const ENOUGH_TIME = 1; // milliseconds

function performWork(deadline) {
  workLoop(deadline);
  if (nextUnitOfWork || updateQueue.length > 0) {
    requestIdleCallback(performWork);
  }
}

function workLoop(deadline) {
  if (!nextUnitOfWork) {
    resetNextUnitOfWork();
  }
  while (nextUnitOfWork && deadline.timeRemaining() > ENOUGH_TIME) {
    nextUnitOfWork = performUnitOfWork(nextUnitOfWork);
  }
  if (pendingCommit) {
    commitAllWork(pendingCommit);
  }
}