import { ElementRef, OnChanges, SimpleChanges } from '@angular/core';
export declare class QRCodeComponent implements OnChanges {
    private elementRef;
    data: string;
    size: number;
    level: string;
    private qr;
    private limits;
    constructor(elementRef: ElementRef);
    ngOnChanges(changes: SimpleChanges): void;
    getType(text: string): number;
    getUTF8Length(text: string): number;
    makeQr(): void;
}