Function commitLayoutEffects_begin

dash/deps/react-dom@18.2.0.js:24627–24687

(subtreeRoot, root, committedLanes)

  }

  function commitLayoutEffects_begin(subtreeRoot, root, committedLanes) {
    // Suspense layout effects semantics don't change for legacy roots.
    var isModernRoot = (subtreeRoot.mode & ConcurrentMode) !== NoMode;

    while (nextEffect !== null) {
      var fiber = nextEffect;
      var firstChild = fiber.child;

      if ( fiber.tag === OffscreenComponent && isModernRoot) {
        // Keep track of the current Offscreen stack's state.
        var isHidden = fiber.memoizedState !== null;
        var newOffscreenSubtreeIsHidden = isHidden || offscreenSubtreeIsHidden;

        if (newOffscreenSubtreeIsHidden) {
          // The Offscreen tree is hidden. Skip over its layout effects.
          commitLayoutMountEffects_complete(subtreeRoot, root, committedLanes);
          continue;
        } else {
          // TODO (Offscreen) Also check: subtreeFlags & LayoutMask
          var current = fiber.alternate;
          var wasHidden = current !== null && current.memoizedState !== null;
          var newOffscreenSubtreeWasHidden = wasHidden || offscreenSubtreeWasHidden;
          var prevOffscreenSubtreeIsHidden = offscreenSubtreeIsHidden;
          var prevOffscreenSubtreeWasHidden = offscreenSubtreeWasHidden; // Traverse the Offscreen subtree with the current Offscreen as the root.

          offscreenSubtreeIsHidden = newOffscreenSubtreeIsHidden;
          offscreenSubtreeWasHidden = newOffscreenSubtreeWasHidden;

          if (offscreenSubtreeWasHidden && !prevOffscreenSubtreeWasHidden) {
            // This is the root of a reappearing boundary. Turn its layout effects
            // back on.
            nextEffect = fiber;
            reappearLayoutEffects_begin(fiber);
          }

          var child = firstChild;

          while (child !== null) {
            nextEffect = child;
            commitLayoutEffects_begin(child, // New root; bubble back up to here and stop.
            root, committedLanes);
            child = child.sibling;
          } // Restore Offscreen state and resume in our-progress traversal.


          nextEffect = fiber;
          offscreenSubtreeIsHidden = prevOffscreenSubtreeIsHidden;
          offscreenSubtreeWasHidden = prevOffscreenSubtreeWasHidden;
          commitLayoutMountEffects_complete(subtreeRoot, root, committedLanes);
          continue;
        }
      }

      if ((fiber.subtreeFlags & LayoutMask) !== NoFlags && firstChild !== null) {
        firstChild.return = fiber;
        nextEffect = firstChild;
      } else {
        commitLayoutMountEffects_complete(subtreeRoot, root, committedLanes);