export declare function renderQrPngBase64(input: string, opts?: {
    scale?: number;
    marginModules?: number;
}): Promise<string>;
/**
 * Render a QR code for a terminal using ONLY ANSI background-color cells — never
 * half-block glyphs. Half-block characters (▀ ▄) render at half the cell height,
 * so mixing them with full-height cells makes rows look squished/uneven and the
 * code breaks up (confirmed in macOS Terminal.app). Here every module is a
 * glyph-less space painted entirely by its background color, so all rows are the
 * same height and the whole code tiles seamlessly — zero artifacts. Each module
 * is one column wide (the code reads taller than wide, but it scans because the
 * stretch is uniform), and a white quiet-zone border is included so a phone
 * camera locks on cleanly. This is the smallest fully artifact-free render
 * possible: one character per module, because anything denser needs glyphs.
 */
export declare function renderQrTerminal(input: string, opts?: {
    quietZone?: number;
    columns?: number;
}): string;