/**
 * @typedef {Object} DecodedJwe
 * @property {Record<string, unknown>} header  Protected (JOSE) header.
 * @property {Buffer} encryptedKey  Wrapped CEK (empty for `dir` / `ECDH-ES`).
 * @property {Buffer} iv  Content-encryption Initialization Vector.
 * @property {Buffer} ciphertext  The AEAD ciphertext.
 * @property {Buffer} tag  The AEAD authentication tag.
 */
/**
 * Split and decode a compact JWE without decrypting it.
 *
 * @param {string} token
 * @returns {DecodedJwe}
 */
declare function decode(token: string): DecodedJwe;
/**
 * Return only the protected header. Handy for `alg` / `enc` / `kid`
 * extraction before calling `decrypt` with a resolver.
 *
 * @param {string} token
 * @returns {Record<string, unknown>}
 */
declare function decodeProtectedHeader(token: string): Record<string, unknown>;
/**
 * Split a compact JWE into its five base64url segments — protected
 * header, encrypted key, IV, ciphertext, authentication tag (RFC 7516
 * §3.1 / §7.1). Exported for internal reuse by `decrypt`.
 *
 * @param {string} token
 * @returns {{ encHeader: string, encKey: string, encIv: string, encCiphertext: string, encTag: string }}
 */
declare function _splitCompact(token: string): {
    encHeader: string;
    encKey: string;
    encIv: string;
    encCiphertext: string;
    encTag: string;
};
type DecodedJwe = {
    /**
     * Protected (JOSE) header.
     */
    header: Record<string, unknown>;
    /**
     * Wrapped CEK (empty for `dir` / `ECDH-ES`).
     */
    encryptedKey: Buffer;
    /**
     * Content-encryption Initialization Vector.
     */
    iv: Buffer;
    /**
     * The AEAD ciphertext.
     */
    ciphertext: Buffer;
    /**
     * The AEAD authentication tag.
     */
    tag: Buffer;
};

export { _splitCompact, decode, decodeProtectedHeader };
export type { DecodedJwe };