/**
 * Synchronized blink hook.
 *
 * All instances derive visibility from the same global animation clock,
 * so every blinking element toggles in unison.
 *
 * @returns `true` when the element should be visible, `false` when hidden.
 *          Always returns `true` when `enabled` is `false`.
 */
export declare function useBlink(enabled: boolean, intervalMs?: number): boolean;
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