import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare enum ViewportSize {
    small = 0,
    medium = 600,
    large = 1024,
    xLarge = 1440
}
export declare namespace ViewportSize {
    function values(): ViewportSize[];
}
export type ViewportMode = 'desktop' | 'tablet' | 'mobile';
export declare class BreakpointObserver {
    private window;
    currentMode: Observable<ViewportMode>;
    currentMinSize: Observable<ViewportSize>;
    currentMaxSize: Observable<ViewportSize>;
    constructor(window: any);
    private watchViewportSize;
    private findMinSize;
    private findMaxSize;
    static ɵfac: i0.ɵɵFactoryDeclaration<BreakpointObserver, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<BreakpointObserver>;
}