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node_modules/@fluentui/react-tabster/lib/hooks/useFocusWithin.js

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+import * as React from 'react';
+import { useFluent_unstable as useFluent } from '@fluentui/react-shared-contexts';
+import { applyFocusWithinPolyfill } from '../focus/focusWithinPolyfill';
+/**
+ * A ponyfill that allows `:focus-within` to support visibility based on keyboard/mouse navigation
+ * like `:focus-visible` https://github.com/WICG/focus-visible/issues/151
+ * @returns ref to the element that uses `:focus-within` styles
+ */ export function useFocusWithin() {
+    const { targetDocument } = useFluent();
+    const elementRef = React.useRef(null);
+    React.useEffect(()=>{
+        if ((targetDocument === null || targetDocument === void 0 ? void 0 : targetDocument.defaultView) && elementRef.current) {
+            return applyFocusWithinPolyfill(elementRef.current, targetDocument.defaultView);
+        }
+    }, [
+        elementRef,
+        targetDocument
+    ]);
+    return elementRef;
+}