import { AfterViewInit, EventEmitter, NgZone, OnChanges, OnDestroy, SimpleChanges } from '@angular/core';
import QrScanner from 'qr-scanner';
import * as i0 from "@angular/core";
export declare class NgxQrScannerComponent implements AfterViewInit, OnDestroy, OnChanges {
    private zone;
    decode: EventEmitter<QrScanner.ScanResult>;
    decodeError: EventEmitter<string | Error>;
    ready: EventEmitter<void>;
    preferredCamera: QrScanner.FacingMode | QrScanner.DeviceId;
    maxScansPerSecond: number | undefined;
    deviceId?: string;
    highlightScanRegion: boolean;
    highlightCodeOutline: boolean;
    calculateScanRegion: ((video: HTMLVideoElement) => QrScanner.ScanRegion) | undefined;
    overlay: HTMLDivElement | undefined;
    private _qrScanner;
    private videoFeed?;
    constructor(zone: NgZone);
    ngAfterViewInit(): void;
    ngOnChanges(changes: SimpleChanges): void;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<NgxQrScannerComponent, never>;
    static ɵcmp: i0.ɵɵComponentDeclaration<NgxQrScannerComponent, "ngx-qr-scanner", never, { "preferredCamera": "preferredCamera"; "maxScansPerSecond": "maxScansPerSecond"; "deviceId": "deviceId"; "highlightScanRegion": "highlightScanRegion"; "highlightCodeOutline": "highlightCodeOutline"; "calculateScanRegion": "calculateScanRegion"; "overlay": "overlay"; }, { "decode": "decode"; "decodeError": "decodeError"; "ready": "ready"; }, never, never>;
}