React DOM shared internal fiber

一、作用

二、导出的常量

1. 内部结构

备注

• NoEventPriority 由 ReactEventPriorities#NoEventPriority 提供

const Internals: ReactDOMInternals = {
  Events: null as any,
  d /* ReactDOMCurrentDispatcher */: DefaultDispatcher,
  p /* currentUpdatePriority */: NoEventPriority,
  findDOMNode: null,
};

三、常量

1. 默认调度器

备注

• noop 由 noop 实现

const DefaultDispatcher: HostDispatcher = {
  // 同步刷新工作
  f /* flushSyncWork */: noop,
  // 请求表单重置
  r /* requestFormReset */: noop,
  // 预取DNS
  D /* prefetchDNS */: noop,
  // 预连接
  C /* preconnect */: noop,
  // 预加载
  L /* preload */: noop,
  m /* preloadModule */: noop,
  X /* preinitScript */: noop,
  S /* preinitStyle */: noop,
  M /* preinitModuleScript */: noop,
};

四、类型

1. ReactDOM 内部模块

type ReactDOMInternals = {
  Events: [any, any, any, any, any, any],
  d /* ReactDOMCurrentDispatcher */: HostDispatcher,
  p /* currentUpdatePriority */: EventPriority,
  findDOMNode:
    | null
    | ((componentOrElement: component(...props: any)) => null | Element | Text),
};