/**
 * USWDS Combo Box Behavior
 *
 * Mirrors official USWDS combo box JavaScript behavior exactly
 *
 * @uswds-source https://github.com/uswds/uswds/blob/develop/packages/usa-combo-box/src/index.js
 * @uswds-version 3.8.0
 * @last-synced 2025-10-05
 * @sync-status ✅ UP TO DATE
 *
 * CRITICAL: This file replicates USWDS source code to maintain 100% behavior parity.
 * DO NOT add custom logic. ALL changes must come from USWDS source updates.
 */
declare const COMBO_BOX_CLASS = "usa-combo-box";
/**
 * Enhance a select element into a combo box component
 *
 * SOURCE: index.js (Lines 160-282)
 *
 * @param _comboBoxEl - Combo box element
 */
declare const enhanceComboBox: (_comboBoxEl: HTMLElement) => void;
/**
 * Initialize combo box behavior
 *
 * SOURCE: index.js (Lines 825-900)
 *
 * @param root - Root element or document
 * @returns Cleanup function
 */
export declare function initializeComboBox(root?: HTMLElement | Document): () => void;
export { enhanceComboBox, COMBO_BOX_CLASS };
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