import { Options } from 'jsqr';
import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class QuarService {
    private videoConstraints;
    private defaultOption;
    private continue$;
    private destroy$;
    constructor();
    capture$(videoElement: HTMLVideoElement, options?: Options): Observable<string>;
    private decode;
    toggle(): void;
    pauseScanner(): void;
    resumeScanner(): void;
    isDeviceCapable(): boolean;
    destroyScanner(): void;
    requestPermissions(): Promise<boolean>;
    getVideoDevices(): Promise<MediaDeviceInfo[]>;
    private isCanvasSupported;
    private isMediaSupported;
    static ɵfac: i0.ɵɵFactoryDeclaration<QuarService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<QuarService>;
}