export type QrScanFacingMode = 'environment' | 'user';
export interface QrScanOptions {
    video: HTMLVideoElement;
    facingMode?: QrScanFacingMode;
    deviceId?: string;
    onResult: (value: string) => void;
    onError?: (error: Error) => void;
    formats?: string[];
    scanIntervalMs?: number;
    onReady?: (track: MediaStreamTrack) => void;
    continuous?: boolean;
}
export interface QrScanController {
    stop: () => void;
    setTorch: (enabled: boolean) => Promise<boolean>;
    isTorchSupported: () => boolean;
    getStream: () => MediaStream | null;
}
export declare const isQrScanSupported: () => boolean;
export declare const isCameraAvailable: () => boolean;
export declare const listVideoInputDevices: () => Promise<MediaDeviceInfo[]>;
export declare const startQrScan: (options: QrScanOptions) => Promise<QrScanController>;
export declare const scanQrCodeOnce: (options: Omit<QrScanOptions, "onResult" | "onError" | "continuous">) => Promise<string>;