import { AfterViewInit, ElementRef, EventEmitter, OnDestroy } from '@angular/core';
import { QrScannerMetadata, QrScannerState } from './types';
import * as i0 from "@angular/core";
/**
 * val-qr-scanner
 *
 * Organism: scanner de códigos QR por cámara (`@zxing/browser` +
 * `@zxing/library`). Emite el texto decodificado por `(scanned)`.
 *
 * Maneja: permiso de cámara denegado (`denied`), ausencia de cámara
 * (`no-camera`), selector cuando hay varias cámaras, y botón start/stop. Hace
 * cleanup del stream en `ngOnDestroy`. i18n auto-registrado (namespace
 * `QrScanner`).
 *
 * Object-first (`@Input() props`) + un único `@Output() scanned`.
 *
 * @example
 * ```html
 * <val-qr-scanner [props]="{ continuous: true }" (scanned)="onScan($event)" />
 * ```
 */
export declare class QrScannerComponent implements AfterViewInit, OnDestroy {
    props: QrScannerMetadata;
    /** Emite el texto decodificado del QR. */
    scanned: EventEmitter<string>;
    videoRef: ElementRef<HTMLVideoElement>;
    private i18n;
    readonly state: import("@angular/core").WritableSignal<QrScannerState>;
    readonly devices: import("@angular/core").WritableSignal<MediaDeviceInfo[]>;
    readonly activeDeviceId: import("@angular/core").WritableSignal<string>;
    private reader;
    private controls;
    private lastValue;
    private lastAt;
    private viewReady;
    constructor();
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    t(key: string): string;
    stateMessage(): string;
    deviceLabel(d: MediaDeviceInfo): string;
    start(deviceId?: string): Promise<void>;
    stop(): void;
    onSelectDevice(deviceId: string): Promise<void>;
    private handleResult;
    private handleStartError;
    /** Detiene el decode + libera el stream de la cámara. */
    private teardown;
    static ɵfac: i0.ɵɵFactoryDeclaration<QrScannerComponent, never>;
    static ɵcmp: i0.ɵɵComponentDeclaration<QrScannerComponent, "val-qr-scanner", never, { "props": { "alias": "props"; "required": false; }; }, { "scanned": "scanned"; }, never, never, true, never>;
}