@primer/react/dist/TreeView/useTreeItemCache.d.ts

An implementation of GitHub's Primer Design System using React

import React from 'react';
/**
 * A hook that caches tree items to avoid expensive querySelectorAll calls on every keypress.
 * The cache is invalidated when the tree structure changes (via MutationObserver).
 *
 * PERFORMANCE: This is critical for INP because querySelectorAll('[role="treeitem"]')
 * on large trees can take 10-50ms, which directly blocks user input response.
 *
 * Note: useRovingTabIndex also uses querySelectorAll for Home/End/PageUp/PageDown navigation,
 * but those are infrequent single keypresses. Typeahead fires on every character typed,
 * making it the priority optimization target.
 */
export declare function useTreeItemCache(containerRef: React.RefObject<HTMLElement>): {
    getTreeItems: () => HTMLElement[];
};
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