Function renderHostElement

packages/react-server/src/ReactFizzServer.js:2256–2326

(
  request: Request,
  task: Task,
  keyPath: KeyNode,
  type: string,
  props: Object,
)

}

function renderHostElement(
  request: Request,
  task: Task,
  keyPath: KeyNode,
  type: string,
  props: Object,
): void {
  const segment = task.blockedSegment;
  if (segment === null) {
    // Replay
    const children = props.children; // TODO: Make this a Config for replaying.
    const prevContext = task.formatContext;
    const prevKeyPath = task.keyPath;
    task.formatContext = getChildFormatContext(prevContext, type, props);
    task.keyPath = keyPath;

    // We use the non-destructive form because if something suspends, we still
    // need to pop back up and finish this subtree of HTML.
    renderNode(request, task, children, -1);

    // We expect that errors will fatal the whole task and that we don't need
    // the correct context. Therefore this is not in a finally.
    task.formatContext = prevContext;
    task.keyPath = prevKeyPath;
  } else {
    // Render
    // RenderTask always has a preambleState
    const children = pushStartInstance(
      segment.chunks,
      type,
      props,
      request.resumableState,
      request.renderState,
      task.blockedPreamble,
      task.hoistableState,
      task.formatContext,
      segment.lastPushedText,
    );
    segment.lastPushedText = false;
    const prevContext = task.formatContext;
    const prevKeyPath = task.keyPath;
    task.keyPath = keyPath;

    const newContext = (task.formatContext = getChildFormatContext(
      prevContext,
      type,
      props,
    ));
    if (isPreambleContext(newContext)) {
      // $FlowFixMe: Refined
      renderPreamble(request, (task: RenderTask), segment, children);
    } else {
      // We use the non-destructive form because if something suspends, we still
      // need to pop back up and finish this subtree of HTML.
      renderNode(request, task, children, -1);
    }

    // We expect that errors will fatal the whole task and that we don't need