/**
* QR Code optimization utilities (Legacy API-based generation)
*
* NOTE: This file is now used only for legacy API-based QR generation.
* The QRCode component no longer uses this API approach by default.
* Entire file retained only for potential external migration and will be removed.
* All consumers should rely on <QRCode /> which now always renders the full-spec internal engine.
*/
/**
 * Simple QR code cache for commonly used values
 */
declare class QRCodeCache {
    private cache;
    private maxSize;
    getCacheKey(value: string, size: number, bg: string, color: string): string;
    get(key: string): string | undefined;
    set(key: string, url: string): void;
}
export declare const qrCodeCache: QRCodeCache;
export {};