mountDehydratedSuspenseComponent() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberBeginWork.js lines 2911–2932

function mountDehydratedSuspenseComponent(
  workInProgress: Fiber,
  suspenseInstance: SuspenseInstance,
  renderLanes: Lanes,
): null | Fiber {
  // During the first pass, we'll bail out and not drill into the children.
  // Instead, we'll leave the content in place and try to hydrate it later.
  if (isSuspenseInstanceFallback(suspenseInstance)) {
    // This is a client-only boundary. Since we won't get any content from the server
    // for this, we need to schedule that at a higher priority based on when it would
    // have timed out. In theory we could render it in this pass but it would have the
    // wrong priority associated with it and will prevent hydration of parent path.
    // Instead, we'll leave work left on it to render it in a separate commit.
    // Schedule a normal pri update to render this content.
    workInProgress.lanes = laneToLanes(DefaultLane);
  } else {
    // We'll continue hydrating the rest at offscreen priority since we'll already
    // be showing the right content coming from the server, it is no rush.
    workInProgress.lanes = laneToLanes(OffscreenLane);
  }
  return null;
}