/**
 * QR Code encoder (ISO/IEC 18004), byte mode, versions 1–40, used to print
 * the code that opens a video resource (#454). The algorithm follows
 * Project Nayuki's reference implementation (MIT): data bits → Reed–Solomon
 * blocks interleaved → function patterns → codewords in the zigzag → the
 * mask with the lowest penalty.
 */
/** Error-correction level: about 7 %, 15 %, 25 % or 30 % of the code can be
 *  damaged (or covered) and still read. */
export type QrErrorCorrection = 'L' | 'M' | 'Q' | 'H';
/** A QR symbol: `size` × `size` modules, row by row, `'1'` for a dark
 *  module. The quiet zone around it is not included. */
export interface QrMatrix {
    size: number;
    rows: string[];
}
/** Encode `text` (UTF-8, byte mode) in the smallest version that holds it at
 *  `ecl`, raising the level while the version still holds the data.
 *  `undefined` when even version 40 is too small. */
export declare function encodeQr(text: string, ecl?: QrErrorCorrection): QrMatrix | undefined;
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