Function updateDeferredValueImpl

dash/deps/react-dom@18.3.1.js:16469–16507

(hook, prevValue, value)

  }

  function updateDeferredValueImpl(hook, prevValue, value) {
    var shouldDeferValue = !includesOnlyNonUrgentLanes(renderLanes);

    if (shouldDeferValue) {
      // This is an urgent update. If the value has changed, keep using the
      // previous value and spawn a deferred render to update it later.
      if (!objectIs(value, prevValue)) {
        // Schedule a deferred render
        var deferredLane = claimNextTransitionLane();
        currentlyRenderingFiber$1.lanes = mergeLanes(currentlyRenderingFiber$1.lanes, deferredLane);
        markSkippedUpdateLanes(deferredLane); // Set this to true to indicate that the rendered value is inconsistent
        // from the latest value. The name "baseState" doesn't really match how we
        // use it because we're reusing a state hook field instead of creating a
        // new one.

        hook.baseState = true;
      } // Reuse the previous value


      return prevValue;
    } else {
      // This is not an urgent update, so we can use the latest value regardless
      // of what it is. No need to defer it.
      // However, if we're currently inside a spawned render, then we need to mark
      // this as an update to prevent the fiber from bailing out.
      //
      // `baseState` is true when the current value is different from the rendered
      // value. The name doesn't really match how we use it because we're reusing
      // a state hook field instead of creating a new one.
      if (hook.baseState) {
        // Flip this back to false.
        hook.baseState = false;
        markWorkInProgressReceivedUpdate();
      }

      hook.memoizedState = value;
      return value;
    }
  }

  function startTransition(setPending, callback, options) {
    var previousPriority = getCurrentUpdatePriority();