React instance map

ReactInstanceMap 维护从面向公共的有状态实例（键）到内部表示（值）的映射。 这允许公共方法接受面向用户的实例作为参数，并将其映射回内部方法。

注意

注意，该模块目前是共享的，并假定为无状态。 如果它变成真正的 Map，将会失效。

/**
 * `ReactInstanceMap` maintains a mapping from a public facing stateful
 * instance (key) and the internal representation (value). This allows public
 * methods to accept the user facing instance as an argument and map them back
 * to internal methods.
 *
 * Note that this module is currently shared and assumed to be stateless.
 * If this becomes an actual Map, that will break.
 */

export function get(key) {
  return key._reactInternals;
}

export function set(key, value) {
  key._reactInternals = value;
}