import { BreakpointObserver } from '@angular/cdk/layout';
import { OnChanges, OnDestroy } from '@angular/core';
import { Subscription } from 'rxjs';
import * as i0 from "@angular/core";
export interface IImageResponsiveUnit {
    [key: string]: string;
}
export declare class ImageResponsiveDirective implements OnChanges, OnDestroy {
    private breakpointObserver;
    src: IImageResponsiveUnit | null;
    srcBindUrl: string;
    currentSize: string;
    breakpointSubscription: Subscription | null;
    constructor(breakpointObserver: BreakpointObserver);
    ngOnChanges(): void;
    ngOnDestroy(): void;
    private setSrc;
    static ɵfac: i0.ɵɵFactoryDeclaration<ImageResponsiveDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ImageResponsiveDirective, "[wsUtilsImageResponsive]", never, { "src": { "alias": "src"; "required": false; }; }, {}, never, never, false, never>;
}