interface IntervalOptions {
    /**
     * Create the interval immediately upon initialization.
     *
     * @default false
     */
    immediate?: boolean;
}
/**
 * A reactive interval timer that integrates with Svelte's reactivity system.
 * The interval runs in the background and can be paused/resumed while maintaining tick count.
 *
 * @example
 * ```javascript
 * // Static duration
 * const timer = new Interval(1000);
 * console.log(timer.current); // Gets current time and starts the interval
 *
 * // Reactive duration
 * let delay = $state(500);
 * const reactiveTimer = new Interval(() => delay);
 * delay = 1000; // Duration updates automatically
 *
 * // Pause and resume
 * timer.pause();
 * timer.resume(); // Resume normally
 * timer.resume(true); // Resume with immediate tick
 *
 * // Check status
 * console.log(timer.tickCount); // Number of times interval has fired
 * console.log(timer.paused); // Current pause state
 * ```
 */
declare class Interval {
    #private;
    /** @private @deprecated DO NOT USE OR YOU WILL BE FIRED */
    _: {
        run_func: () => void;
        is_active: boolean;
        tick_count: number;
        increment_tick: () => void;
        update: (() => void) | undefined;
        trigger_update: () => void;
        force_restart: () => void;
    };
    /**
     * Creates a new Interval instance.
     *
     * @param duration - The interval duration in milliseconds. Can be a number or a reactive function.
     */
    constructor(duration: number | (() => number), options?: IntervalOptions);
    /**
     * Resumes the interval if it was paused.
     *
     * @param immediate - If true, immediately triggers a tick and resets the interval timing.
     */
    resume(immediate?: boolean): void;
    /**
     * Pauses the interval. The interval continues running in the background but stops executing callbacks and incrementing tick count.
     */
    pause(): void;
    /**
     * Gets the current paused state of the interval.
     */
    get isActive(): boolean;
    /**
     * Gets the number of times the interval has fired (tick count).
     * This count persists across pause/resume cycles and duration changes.
     */
    get tickCount(): number;
    /**
     * Gets the current date and time, and starts the interval if not already started.
     * This is the primary way to activate the interval's reactivity.
     */
    get current(): Date;
    /**
     * Gets the current duration of the interval in milliseconds.
     */
    get duration(): number | (() => number);
    set duration(value: number | (() => number));
    /**
     * Completely stops and clears the interval. Cannot be resumed.
     * Use pause()/resume() if you want to temporarily stop.
     */
    stop(): void;
    /**
     * Check if interval has been completely stopped
     */
    get isStopped(): boolean;
    [Symbol.dispose](): void;
}
declare function sync(...intervals: Interval[]): {
    enable(): void;
    disable(): void;
    readonly isSynced: boolean;
    readonly leader: Interval;
};
declare class LimitedInterval extends Interval {
    #private;
    constructor(duration: number | (() => number), maxTicks: number, options?: IntervalOptions);
    get isCompleted(): boolean;
    get remainingTicks(): number;
    get maxTicks(): number;
    reset(): void;
    set maxTicks(new_max: number);
}

export { Interval, type IntervalOptions, LimitedInterval, sync };