Function renderModel

packages/react-server/src/ReactFlightServer.js:3198–3322

(
  request: Request,
  task: Task,
  parent:
    | {+[key: string | number]: ReactClientValue}
    | $ReadOnlyArray<ReactClientValue>,
  key: string,
  value: ReactClientValue,
)

let modelRoot: null | ReactClientValue = false;

function renderModel(
  request: Request,
  task: Task,
  parent:
    | {+[key: string | number]: ReactClientValue}
    | $ReadOnlyArray<ReactClientValue>,
  key: string,
  value: ReactClientValue,
): ReactJSONValue {
  // First time we're serializing the key, we should add it to the size.
  serializedSize += key.length;

  const prevKeyPath = task.keyPath;
  const prevImplicitSlot = task.implicitSlot;
  try {
    return renderModelDestructive(request, task, parent, key, value);
  } catch (thrownValue) {
    // If the suspended/errored value was an element or lazy it can be reduced
    // to a lazy reference, so that it doesn't error the parent.
    const model = task.model;
    const wasReactNode =
      typeof model === 'object' &&
      model !== null &&
      ((model: any).$$typeof === REACT_ELEMENT_TYPE ||
        (model: any).$$typeof === REACT_LAZY_TYPE);

    if (request.status === ABORTING) {
      task.status = ABORTED;
      if (enableHalt && request.type === PRERENDER) {
        // This will create a new task and refer to it in this slot
        // the new task won't be retried because we are aborting
        return outlineHaltedTask(request, task, wasReactNode);
      }
      const errorId = (request.fatalError: any);
      if (wasReactNode) {
        return serializeLazyID(errorId);
      }
      return serializeByValueID(errorId);
    }

    const x =
      thrownValue === SuspenseException
        ? // This is a special type of exception used for Suspense. For historical
          // reasons, the rest of the Suspense implementation expects the thrown
          // value to be a thenable, because before `use` existed that was the
          // (unstable) API for suspending. This implementation detail can change
          // later, once we deprecate the old API in favor of `use`.
          getSuspendedThenable()
        : thrownValue;

    if (typeof x === 'object' && x !== null) {
      // $FlowFixMe[method-unbinding]
      if (typeof x.then === 'function') {
        // Something suspended, we'll need to create a new task and resolve it later.
        const newTask = createTask(
          request,
          task.model,
          task.keyPath,