/**
 * QR Code encoder — thin adapter over `qrcode-generator` (Kazuhiko Arase's
 * reference implementation, pinned at exact version, zero transitive deps).
 *
 * Defaults to byte mode so the input string is preserved verbatim,
 * including case. The earlier alphanumeric-mode-only API uppercased
 * everything, which broke wallets that validate ETH addresses against
 * EIP-55 (lowercase `0x` prefix; mixed-case checksum).
 *
 * For pure-uppercase / pure-numeric payloads, alphanumeric mode is
 * denser; opt in via the `mode` option.
 */
export type QrMode = 'Byte' | 'Alphanumeric';
export type QrEcLevel = 'L' | 'M' | 'Q' | 'H';
export interface QrEncodeOpts {
    /**
     * Force a specific version (1–40). If omitted, the library picks the
     * smallest fitting version for the input.
     */
    version?: number;
    /**
     * QR encoding mode. Defaults to `'Byte'` (case-preserving, works for
     * any UTF-8 string). `'Alphanumeric'` is denser but only supports
     * digits, uppercase A–Z, space, and `$%*+-./:`.
     */
    mode?: QrMode;
    /**
     * Error-correction level. Defaults to `'M'` (~15% damage tolerance):
     * our QRs are phone-scanned off terminal glass — glare, moiré, themed
     * low-contrast rendering — where L (~7%) is marginal. For the payload
     * we care most about (a 42-char 0x address), M costs nothing: it fits
     * QR version 3 (29×29) at either level.
     */
    ecLevel?: QrEcLevel;
}
/**
 * Encode a string into a QR bit matrix.
 *
 * In byte mode (the default) any input is accepted as-is. In alphanumeric
 * mode we validate up front rather than letting the library silently
 * fall back to byte mode, so callers who asked for the denser encoding
 * get a clear error if their input doesn't qualify.
 */
export declare function encode(input: string, opts?: QrEncodeOpts): boolean[][];
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