import { OnChanges, ViewContainerRef } from "@angular/core";
import { QrCodeErrorCorrectionLevel, RGBAColor } from "./types";
import * as i0 from "@angular/core";
export declare class QrCodeDirective implements OnChanges {
    private viewContainerRef;
    static readonly DEFAULT_ERROR_CORRECTION_LEVEL: QrCodeErrorCorrectionLevel;
    static readonly DEFAULT_CENTER_IMAGE_SIZE = 40;
    value: string;
    version?: number;
    errorCorrectionLevel: QrCodeErrorCorrectionLevel;
    width?: number;
    height?: number;
    darkColor: RGBAColor;
    lightColor: RGBAColor;
    centerImageSrc?: string;
    centerImageWidth?: number | string;
    centerImageHeight?: number | string;
    margin: number;
    private centerImage?;
    constructor(viewContainerRef: ViewContainerRef);
    ngOnChanges(): Promise<void>;
    static ɵfac: i0.ɵɵFactoryDeclaration<QrCodeDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<QrCodeDirective, "canvas[qrCode]", never, { "value": { "alias": "qrCode"; "required": false; }; "version": { "alias": "qrCodeVersion"; "required": false; }; "errorCorrectionLevel": { "alias": "qrCodeErrorCorrectionLevel"; "required": false; }; "width": { "alias": "width"; "required": false; }; "height": { "alias": "height"; "required": false; }; "darkColor": { "alias": "darkColor"; "required": false; }; "lightColor": { "alias": "lightColor"; "required": false; }; "centerImageSrc": { "alias": "qrCodeCenterImageSrc"; "required": false; }; "centerImageWidth": { "alias": "qrCodeCenterImageWidth"; "required": false; }; "centerImageHeight": { "alias": "qrCodeCenterImageHeight"; "required": false; }; "margin": { "alias": "qrCodeMargin"; "required": false; }; }, {}, never, never, true, never>;
}