import { LiveAnnouncer } from '@angular/cdk/a11y';
import * as i0 from "@angular/core";
export declare class QueuedAnnouncer {
    private _liveAnnouncer;
    private _msgQueue;
    private _isAnnouncing;
    constructor(_liveAnnouncer: LiveAnnouncer);
    enqueue(msg: string | undefined): void;
    private _announceNext;
    static ɵfac: i0.ɵɵFactoryDeclaration<QueuedAnnouncer, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<QueuedAnnouncer>;
}