text: /**
   * Copyright (c) 2013-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   *
   * @flow strict
   * @format
   */
  
  'use strict';
  
  /**
   * Determine if a given value is an object that implements the `RelayEnvironment`
   * interface.
   */
  function isClassicRelayEnvironment(environment: mixed): boolean {
    return (
      typeof environment === 'object' &&
      environment !== null &&
      typeof environment.applyMutation === 'function' &&
      typeof environment.sendMutation === 'function' &&
      typeof environment.forceFetch === 'function' &&
      typeof environment.getFragmentResolver === 'function' &&
      typeof environment.getStoreData === 'function' &&
      typeof environment.primeCache === 'function'
    );
  }
  
  module.exports = isClassicRelayEnvironment;
  