Function updateWorkInProgressHook

docs/external/js/react-dom.development.js:15078–15138

()

  }

  function updateWorkInProgressHook() {
    // This function is used both for updates and for re-renders triggered by a
    // render phase update. It assumes there is either a current hook we can
    // clone, or a work-in-progress hook from a previous render pass that we can
    // use as a base. When we reach the end of the base list, we must switch to
    // the dispatcher used for mounts.
    var nextCurrentHook;

    if (currentHook === null) {
      var current = currentlyRenderingFiber$1.alternate;

      if (current !== null) {
        nextCurrentHook = current.memoizedState;
      } else {
        nextCurrentHook = null;
      }
    } else {
      nextCurrentHook = currentHook.next;
    }

    var nextWorkInProgressHook;

    if (workInProgressHook === null) {
      nextWorkInProgressHook = currentlyRenderingFiber$1.memoizedState;
    } else {
      nextWorkInProgressHook = workInProgressHook.next;
    }

    if (nextWorkInProgressHook !== null) {
      // There's already a work-in-progress. Reuse it.
      workInProgressHook = nextWorkInProgressHook;
      nextWorkInProgressHook = workInProgressHook.next;
      currentHook = nextCurrentHook;
    } else {
      // Clone from the current hook.
      if (!(nextCurrentHook !== null)) {
        {
          throw Error( "Rendered more hooks than during the previous render." );
        }
      }

      currentHook = nextCurrentHook;
      var newHook = {
        memoizedState: currentHook.memoizedState,
        baseState: currentHook.baseState,
        baseQueue: currentHook.baseQueue,
        queue: currentHook.queue,
        next: null
      };

      if (workInProgressHook === null) {
        // This is the first hook in the list.
        currentlyRenderingFiber$1.memoizedState = workInProgressHook = newHook;
      } else {
        // Append to the end of the list.
        workInProgressHook = workInProgressHook.next = newHook;
      }
    }