import { SnackbarItem, SnackbarItemRef, SnackbarOptions } from '../models';
import * as i0 from "@angular/core";
export declare class SnackbarQueueService {
    private readonly queue$$;
    private readonly onRemove$$;
    readonly current$: import("rxjs").Observable<SnackbarItemRef & {
        id: string | number;
    }>;
    readonly queue$: import("rxjs").Observable<(SnackbarItemRef & {
        id: string | number;
    })[]>;
    readonly onRemove$: import("rxjs").Observable<SnackbarItemRef>;
    add(item: SnackbarItem, options: SnackbarOptions): SnackbarItemRef;
    remove(itemRef: SnackbarItemRef): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<SnackbarQueueService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<SnackbarQueueService>;
}
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