import type { SignAuthorizationReturnType } from 'viem/accounts';
import type { SerializedAuthorization } from '../types';
/**
 * Converts a viem `SignAuthorizationReturnType` into a plain serializable
 * object suitable for JSON transport to the sponsorship API.
 *
 * viem's `Signature` type allows legacy v-only signatures without `yParity`,
 * but our signing flow always produces one — explicitly check for `undefined`
 * (not falsiness) so the valid `yParity: 0` recovery bit isn't rejected.
 */
export declare const toSerializedAuthorization: (auth: SignAuthorizationReturnType) => SerializedAuthorization;