text: /**
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   *
   * @flow
   */
  
  import {
    REACT_CONTEXT_TYPE,
    REACT_FORWARD_REF_TYPE,
    REACT_FRAGMENT_TYPE,
    REACT_PROFILER_TYPE,
    REACT_PROVIDER_TYPE,
    REACT_STRICT_MODE_TYPE,
    REACT_SUSPENSE_TYPE,
    REACT_SUSPENSE_LIST_TYPE,
    REACT_MEMO_TYPE,
    REACT_LAZY_TYPE,
    REACT_FUNDAMENTAL_TYPE,
    REACT_RESPONDER_TYPE,
    REACT_SCOPE_TYPE,
    REACT_BLOCK_TYPE,
    REACT_SERVER_BLOCK_TYPE,
  } from 'shared/ReactSymbols';
  
  export default function isValidElementType(type: mixed) {
    return (
      typeof type === 'string' ||
      typeof type === 'function' ||
      // Note: its typeof might be other than 'symbol' or 'number' if it's a polyfill.
      type === REACT_FRAGMENT_TYPE ||
      type === REACT_PROFILER_TYPE ||
      type === REACT_STRICT_MODE_TYPE ||
      type === REACT_SUSPENSE_TYPE ||
      type === REACT_SUSPENSE_LIST_TYPE ||
      (typeof type === 'object' &&
        type !== null &&
        (type.$$typeof === REACT_LAZY_TYPE ||
          type.$$typeof === REACT_MEMO_TYPE ||
          type.$$typeof === REACT_PROVIDER_TYPE ||
          type.$$typeof === REACT_CONTEXT_TYPE ||
          type.$$typeof === REACT_FORWARD_REF_TYPE ||
          type.$$typeof === REACT_FUNDAMENTAL_TYPE ||
          type.$$typeof === REACT_RESPONDER_TYPE ||
          type.$$typeof === REACT_SCOPE_TYPE ||
          type.$$typeof === REACT_BLOCK_TYPE ||
          type[(0: any)] === REACT_SERVER_BLOCK_TYPE))
    );
  }
  