/**
 * Render a QR bit matrix as terminal text.
 *
 * Each QR module becomes `██` (two full-block chars wide × one line tall).
 * Monospace terminal cells are ~1:2 (width:height), so 2 chars wide × 1
 * line tall lands at roughly square — the shape a phone camera expects.
 *
 * We deliberately avoid the half-block trick (`▀ ▄ █`) because it requires
 * the terminal to render line spacing such that `▀` aligns flush with the
 * `▄` below — Warp, iTerm with custom fonts, and tmux all add sub-pixel
 * gaps that produce non-square modules and break scanner lock.
 *
 * We also deliberately avoid ANSI background colours: themed terminals
 * (Warp's default theme, low-contrast iTerm themes) render `[40m` /
 * `[47m` at insufficient contrast for a phone camera. Plain block chars
 * inherit the terminal's natural fg/bg contrast.
 *
 * On a dark-theme terminal this renders as light-on-dark (inverted
 * polarity); on a light theme, dark-on-light. Phone scanners accept
 * either polarity. A 4-module quiet zone (ISO/IEC 18004 §6.3) is added
 * so scanners reliably locate the finder patterns.
 */
export interface RenderOpts {
    /** Modules of light padding around the matrix (default 4 — the QR spec minimum). */
    quietZone?: number;
}
export declare function renderTerminal(matrix: boolean[][], opts?: RenderOpts): string;
/**
 * Alias for {@link renderTerminal}. Kept for callers that imported the
 * old name; renderTerminal is now also pure ASCII / Unicode block chars
 * with no ANSI dependency.
 */
export declare const renderAscii: typeof renderTerminal;
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