/**
 * Freeze `Date` / timers at the given instant (Vitest fake timers).
 *
 * @param date - Moment to freeze; defaults to `new Date()`.
 */
export declare function freezeTime(date?: Date): void;
/**
 * Jump the fake clock to a specific date.
 *
 * @param date - Target instant.
 */
export declare function travelTo(date: Date): void;
/**
 * Advance fake time by milliseconds.
 *
 * @param ms - Milliseconds to move forward.
 */
export declare function travelForward(ms: number): void;
/**
 * Move fake time backward by milliseconds.
 *
 * @param ms - Milliseconds to move back.
 */
export declare function travelBack(ms: number): void;
/**
 * Restore real timers.
 */
export declare function unfreezeTime(): void;
/**
 * Current mocked system time when fake timers are enabled.
 *
 * @returns Current time from Vitest, or real `Date` otherwise.
 */
export declare function now(): Date;
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