协调器的根入口文件。
import typeof * as ReconcilerAPI from './src/ReactFiberReconciler';
import typeof * as HostConfig from './src/ReactFiberConfig';
export * from './src/ReactFiberReconciler';
// At build time, this module is wrapped as a factory function ($$$reconciler).
// Consumers pass a host config object and get back the reconciler API.
declare export default (hostConfig: HostConfig) => ReconcilerAPI;