import { MediaChange, MediaObserver } from '@angular/flex-layout';
import { Injector, OnDestroy } from '@angular/core';
import { Subscription } from 'rxjs';
export declare abstract class MediaTracker implements OnDestroy {
    mediaObserver: MediaObserver;
    isMobile: boolean;
    isXs: boolean;
    isSm: boolean;
    watcher: Subscription;
    protected constructor(injector: Injector);
    onChangeMediaTracker: (change: MediaChange) => void;
    ngOnDestroy(): void;
}