import { Handle } from 'dojo-interfaces/core';
export interface QueueItem {
    isActive: boolean;
    callback: null | ((...args: any[]) => any);
}
/**
 * Schedules a callback to the macrotask queue.
 *
 * @param callback the function to be queued and later executed.
 * @returns An object with a `destroy` method that, when called, prevents the registered callback from executing.
 */
export declare const queueTask: (callback: (...args: any[]) => any) => Handle;
/**
 * Schedules an animation task with `window.requestAnimationFrame` if it exists, or with `queueTask` otherwise.
 *
 * Since requestAnimationFrame's behavior does not match that expected from `queueTask`, it is not used there.
 * However, at times it makes more sense to delegate to requestAnimationFrame; hence the following method.
 *
 * @param callback the function to be queued and later executed.
 * @returns An object with a `destroy` method that, when called, prevents the registered callback from executing.
 */
export declare const queueAnimationTask: (callback: (...args: any[]) => any) => Handle;
/**
 * Schedules a callback to the microtask queue.
 *
 * Any callbacks registered with `queueMicroTask` will be executed before the next macrotask. If no native
 * mechanism for scheduling macrotasks is exposed, then any callbacks will be fired before any macrotask
 * registered with `queueTask` or `queueAnimationTask`.
 *
 * @param callback the function to be queued and later executed.
 * @returns An object with a `destroy` method that, when called, prevents the registered callback from executing.
 */
export declare let queueMicroTask: (callback: (...args: any[]) => any) => Handle;