Function renderElement

packages/react-server/src/ReactFlightServer.js:2102–2251

(
  request: Request,
  task: Task,
  type: any,
  key: null | string,
  ref: mixed,
  props: any,
  validated: number, // DEV only
)

}

function renderElement(
  request: Request,
  task: Task,
  type: any,
  key: null | string,
  ref: mixed,
  props: any,
  validated: number, // DEV only
): ReactJSONValue {
  if (ref !== null && ref !== undefined) {
    // When the ref moves to the regular props object this will implicitly
    // throw for functions. We could probably relax it to a DEV warning for other
    // cases.
    // TODO: `ref` is now just a prop when `enableRefAsProp` is on. Should we
    // do what the above comment says?
    throw new Error(
      'Refs cannot be used in Server Components, nor passed to Client Components.',
    );
  }
  if (__DEV__) {
    jsxPropsParents.set(props, type);
    if (typeof props.children === 'object' && props.children !== null) {
      jsxChildrenParents.set(props.children, type);
    }
  }
  if (
    typeof type === 'function' &&
    !isClientReference(type) &&
    !isOpaqueTemporaryReference(type)
  ) {
    // This is a Server Component.
    return renderFunctionComponent(request, task, key, type, props, validated);
  } else if (type === REACT_FRAGMENT_TYPE && key === null) {
    // For key-less fragments, we add a small optimization to avoid serializing
    // it as a wrapper.
    if (__DEV__ && validated === 2) {
      // Create a fake owner node for the error stack.
      const componentDebugInfo: ReactComponentInfo = {
        name: 'Fragment',
        env: (0, request.environmentName)(),
        key: key,
        owner: task.debugOwner,
        stack:
          task.debugStack === null
            ? null
            : filterStackTrace(request, parseStackTrace(task.debugStack, 1)),
        props: props,
        debugStack: task.debugStack,
        debugTask: task.debugTask,
      };
      warnForMissingKey(request, key, componentDebugInfo, task.debugTask);
    }
    const prevImplicitSlot = task.implicitSlot;
    if (task.keyPath === null) {
      task.implicitSlot = true;
    }
    const json = renderModelDestructive(
      request,