Function startTransition

docs/index.js:8006–8052

(fiber, queue, pendingState, finishedState, callback)

  return prevValue;
}
function startTransition(fiber, queue, pendingState, finishedState, callback) {
  var previousPriority = ReactDOMSharedInternals.p;
  ReactDOMSharedInternals.p =
    0 !== previousPriority && 8 > previousPriority ? previousPriority : 8;
  var prevTransition = ReactSharedInternals.T,
    currentTransition = {};
  ReactSharedInternals.T = currentTransition;
  dispatchOptimisticSetState(fiber, !1, queue, pendingState);
  try {
    var returnValue = callback(),
      onStartTransitionFinish = ReactSharedInternals.S;
    null !== onStartTransitionFinish &&
      onStartTransitionFinish(currentTransition, returnValue);
    if (
      null !== returnValue &&
      "object" === typeof returnValue &&
      "function" === typeof returnValue.then
    ) {
      var thenableForFinishedState = chainThenableValue(
        returnValue,
        finishedState
      );
      dispatchSetStateInternal(
        fiber,
        queue,
        thenableForFinishedState,
        requestUpdateLane(fiber)
      );
    } else
      dispatchSetStateInternal(
        fiber,
        queue,
        finishedState,
        requestUpdateLane(fiber)
      );
  } catch (error) {
    dispatchSetStateInternal(
      fiber,
      queue,
      { then: function () {}, status: "rejected", reason: error },
      requestUpdateLane()
    );
  } finally {
    (ReactDOMSharedInternals.p = previousPriority),
      (ReactSharedInternals.T = prevTransition);
  }
}
function noop$2() {}
function startHostTransition(formFiber, pendingState, action, formData) {
  if (5 !== formFiber.tag) throw Error(formatProdErrorMessage(476));