Function workLoopConcurrent

packages/react-reconciler/src/ReactFiberWorkLoop.js:2965–2979

@noinline

(nonIdle: boolean)

/** @noinline */
function workLoopConcurrent(nonIdle: boolean) {
  // We yield every other "frame" when rendering Transition or Retries. Those are blocking
  // revealing new content. The purpose of this yield is not to avoid the overhead of yielding,
  // which is very low, but rather to intentionally block any frequently occuring other main
  // thread work like animations from starving our work. In other words, the purpose of this
  // is to reduce the framerate of animations to 30 frames per second.
  // For Idle work we yield every 5ms to keep animations going smooth.
  if (workInProgress !== null) {
    const yieldAfter = now() + (nonIdle ? 25 : 5);
    do {
      // $FlowFixMe[incompatible-call] flow doesn't know that now() is side-effect free
      performUnitOfWork(workInProgress);
    } while (workInProgress !== null && now() < yieldAfter);
  }
}

/** @noinline */
function workLoopConcurrentByScheduler() {