type eclType = 'L' | 'M' | 'Q' | 'H';
type BaseQRCodeOptions = {
    size?: number;
    errorCorrection?: eclType;
    logoPath?: string | null;
};
type PngQRCodeOptions = BaseQRCodeOptions & {
    format?: 'png';
    filePath: string;
    fileName: string;
};
type SvgQRCodeOptions = BaseQRCodeOptions & {
    format: 'svg';
} & ({
    filePath: string;
    fileName: string;
} | {
    filePath?: undefined;
    fileName?: undefined;
});
type Base64QRCodeOptions = BaseQRCodeOptions & {
    format: 'base64';
    filePath?: never;
    fileName?: never;
};
type QRCodeOptions = PngQRCodeOptions | SvgQRCodeOptions | Base64QRCodeOptions;

declare class QR {
    constructor();
    private static validateLogoPath;
    static generate(payload: any, options: QRCodeOptions): Promise<string | boolean>;
}

export { QR, QR as default };