import { StreamableFile } from '@nestjs/common';
import { Format } from './qr-code.format';
export declare class QrCodeService {
    /**
     * Generates a QR code for the given Key URI in the given image format
     *
     * @internal
     * @param uri
     * @param format
     */
    generate(uri: string, format: Format): Promise<StreamableFile>;
    /**
     * Returns a type annotated readable stream, ready to be served with a
     * NestJS controller
     *
     * @private
     * @param stream
     * @param format
     */
    private getStreamableFile;
}