React synthetic event type

导出了 React 的合成事件类型声明

import type { Fiber } from 'react-reconciler/src/ReactInternalTypes';
import type { DOMEventName } from './_DOMEventNames';

// 调度配置
export type DispatchConfig = {
  dependencies?: Array<DOMEventName>;
  phasedRegistrationNames: {
    bubbled: null | string;
    captured: null | string;
  };
  registrationName?: string;
};
// 基础合成事件
type BaseSyntheticEvent = {
  isPersistent: () => boolean;
  isPropagationStopped: () => boolean;
  _dispatchInstances?: null | Array<Fiber | null> | Fiber;
  _dispatchListeners?: null | Array<Function> | Function;
  _targetInst: Fiber;
  nativeEvent: Event;
  target?: mixed;
  relatedTarget?: mixed;
  type: string;
  currentTarget: null | EventTarget;
};
// 已知 React 合成事件
export type KnownReactSyntheticEvent = BaseSyntheticEvent & {
  _reactName: string;
};
// 未知的 React 合成事件
export type UnknownReactSyntheticEvent = BaseSyntheticEvent & {
  _reactName: null;
};

// React合成事件
export type ReactSyntheticEvent =
  | KnownReactSyntheticEvent
  | UnknownReactSyntheticEvent;