@docusaurus/core/lib/client/exports/ExecutionEnvironment.js

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/**
 * 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.
 */
const canUseDOM = typeof window !== 'undefined' &&
    'document' in window &&
    'createElement' in window.document;
const ExecutionEnvironment = {
    canUseDOM,
    // window.attachEvent is IE-specific; it's very likely Docusaurus won't work
    // on IE anyway.
    canUseEventListeners: canUseDOM && ('addEventListener' in window || 'attachEvent' in window),
    canUseIntersectionObserver: canUseDOM && 'IntersectionObserver' in window,
    canUseViewport: canUseDOM && 'screen' in window,
};
export default ExecutionEnvironment;