import { Observable } from 'rxjs';
export declare enum ScanType {
    qrCode = "qrCode",
    barCode = "barCode",
}
/**
 * 调起微信扫一扫
 * @param needResult 扫描结果由微信处理，true 则直接返回扫描结果
 * @param scanType 可以指定扫二维码还是条码，默认二者都有
 */
export declare function scanQRCode(needResult?: boolean, scanType?: ScanType[]): Observable<string>;