declare const enum PriorityLevel {
    NoPriority = 0,
    ImmediatePriority = 1,
    UserBlockingPriority = 2,
    NormalPriority = 3,
    LowPriority = 4,
    IdlePriority = 5
}

interface SchedulerTaskZone {
    run<T>(fn: (...args: any[]) => T): T;
}
interface ReactSchedulerTask {
    id: number;
    sortIndex: number;
    callback: Function;
    priorityLevel: PriorityLevel;
    startTime: number;
    expirationTime: number;
    isQueued?: boolean;
    ngZone?: SchedulerTaskZone;
}

interface ScheduleCallbackOptions {
    delay?: number;
    ngZone?: SchedulerTaskZone;
}
declare function scheduleCallback(priorityLevel: PriorityLevel, callback: VoidFunction, options?: ScheduleCallbackOptions): ReactSchedulerTask;
declare function cancelCallback(task: any): void;
declare function forceFrameRate(fps: any): void;

export { PriorityLevel, cancelCallback, forceFrameRate, scheduleCallback };