Function get

docs/external/js/react-dom.development.js:2911–2913

* `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 current

(key)

   * If this becomes an actual Map, that will break.
   */
  function get(key) {
    return key._reactInternalFiber;
  }
  function has$1(key) {
    return key._reactInternalFiber !== undefined;
  }