/**
 * Utils related to timers and loops.
 */
export declare let requestAnimationFrame: (callback: FrameRequestCallback) => number;
export declare let cancelAnimationFrame: (handle: number) => void;
/**
 * Holds a list of callback functions that are invoked repeatedly with a fixed
 * time delay between each call, as provided to the constructor. The default is
 * 200ms. The interval will stop when the list is empty and resume when it is
 * not empty.
 */
export declare class IntervalList {
    private _interval;
    private _callbacks;
    private _id;
    /**
     * @param {number} interval Time in ms.
     */
    constructor(interval?: number);
    /**
     * Add a callback to the list. If the list was empty before this action,
     * the interval will be started.
     *
     * @param {Function} callback
     */
    add(callback: Function): void;
    /**
     * Remove a callback from the list. If this action results in an empty list,
     * the interval will be stopped.
     *
     * @param {Function} callback
     */
    remove(callback: Function): void;
    /**
     * Start the interval.
     */
    start(): void;
    /**
     * Stop the interval.
     */
    stop(): void;
}
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