import type { Ref } from '@stacksjs/stx';
/**
 * Reactive key modifier state (e.g., Shift, Control, Alt, Meta).
 */
export declare function useKeyModifier(modifier: KeyModifier): Ref<boolean>;
export type KeyModifier = 'Alt' | 'AltGraph' | 'CapsLock' | 'Control' | 'Fn' | 'FnLock' | 'Meta' | 'NumLock' | 'ScrollLock' | 'Shift' | 'Symbol' | 'SymbolLock';