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refactor(core): use has instead of get to test for existence in ExecEnv (#7763)

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refactor(core): use has instead of get to test for existence
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Joshua Chen 2022-07-11 19:19:17 +08:00 • committed by GitHub
parent f21dadf621
commit 636d47060e
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1 changed files with 7 additions and 8 deletions
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packages/docusaurus/src/client/exports/ExecutionEnvironment.ts
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@ -5,23 +5,22 @@
* LICENSE file in the root directory of this source tree. * LICENSE file in the root directory of this source tree.
*/ */
const canUseDOM = !!( const canUseDOM =
typeof window !== 'undefined' && typeof window !== 'undefined' &&
window.document && 'document' in window &&
window.document.createElement 'createElement' in window.document;
);
const ExecutionEnvironment = { const ExecutionEnvironment = {
canUseDOM, canUseDOM,
// window.attachEvent is IE-specific; it's very likely Docusaurus won't work
// on IE anyway.
canUseEventListeners: canUseEventListeners:
// @ts-expect-error: window.attachEvent is IE specific. canUseDOM && ('addEventListener' in window || 'attachEvent' in window),
// See https://github.com/Microsoft/TypeScript/issues/3953#issuecomment-123396830
canUseDOM && !!(window.addEventListener || window.attachEvent),
canUseIntersectionObserver: canUseDOM && 'IntersectionObserver' in window, canUseIntersectionObserver: canUseDOM && 'IntersectionObserver' in window,
canUseViewport: canUseDOM && !!window.screen, canUseViewport: canUseDOM && 'screen' in window,
}; };
export default ExecutionEnvironment; export default ExecutionEnvironment;