React 元素类型

export type ReactElement = {
  $$typeof: any,
  type: any,
  key: any,
  ref: any,
  props: any,
  // __DEV__ or for string refs
  _owner: any,

  // __DEV__
  // 0: not validated, 1: validated, 2: force fail
  _store: {validated: 0 | 1 | 2, ...},
  _debugInfo: null | ReactDebugInfo,
  _debugStack: Error,
  _debugTask: null | ConsoleTask,
};