/**
 * Interactive-only decoration DEGRADES, it does not disappear. The QR renders
 * on a TTY and is omitted when piped — an agent has no camera, and a thousand
 * block characters in a tool transcript is a real cost to the creator's context
 * window. The URL beside it is always present and is the actual payload.
 */
export declare function shouldRenderQr(opts: {
    isTTY: boolean;
    noQr: boolean;
    columns?: number;
}): boolean;
/**
 * renderModules turns a boolean module matrix into half-block rows.
 *
 * The convention is INVERTED from the obvious one: a set module is rendered as
 * the BACKGROUND (a space) and an unset module as a block. Terminals are
 * overwhelmingly light-on-dark, and a scanner needs the quiet zone and the light
 * modules to be the brighter of the two. Getting this backwards produces a
 * symbol that looks perfect and scans on nothing.
 */
export declare function renderModules(modules: boolean[][]): string[];
/**
 * Build the terminal QR for a preview URL.
 *
 * A ~62-character preview URL fits a version-3/4 symbol at error-correction
 * level L. L rather than M because the terminal render is pixel-perfect — there
 * is no print smudge or camera blur to recover from at the source, only at the
 * lens — and every step up in correction level adds modules, which adds rows.
 */
export declare function renderTerminalQr(url: string): Promise<string[]>;