import { NgZone, Injector } from '@angular/core';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/take';
import 'rxjs/add/operator/publish';
import 'rxjs/add/operator/observeOn';
export declare type Deadline = {
    didTimeout: boolean;
    timeRemaining: () => number;
};
export declare type IdleCallback = (deadline: Deadline) => void;
export declare type IdleOptions = {
    timeout: number;
};
export declare class Idle {
    ngZone: NgZone;
    idleHandlers: Map<{}, {}>;
    stableObservable$: any;
    constructor(ngZone: NgZone);
    requestIdleCallback(callback: any): void;
    cancelIdleCallback(handler: any): void;
    polyfillCancelIdleCallback(handler: any): void;
    polyfillRequestIdleCallback(callback: IdleCallback, {timeout}?: IdleOptions): void;
}
export declare const ANGULARCLASS_IDLE_PROVIDERS: typeof Idle[];
export declare function setupPrefetchInitializer(injector: Injector, callbacks?: Array<Function>): () => any;
export declare function providePrefetchIdleCallbacks(prefetchCallbacks?: any[]): (typeof Idle | {
    provide: any;
    multi: boolean;
    useFactory: (injector: any) => () => any;
    deps: typeof Injector[];
})[];