react/packages/shared/ExecutionEnvironment.js

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */

export const canUseDOM: boolean = !!(
  typeof window !== 'undefined' &&
  typeof window.document !== 'undefined' &&
  typeof window.document.createElement !== 'undefined'
);