/**
 * JWT signing utilities for outbound composed credentials.
 */
/**
 * Sign a credential JWT with the given claims and identity config.
 */
export declare function signCredential(claims: Record<string, unknown>, config: {
    issuer: string;
    subject: string;
    audience: string;
    privateKey: JsonWebKey;
    /** JWT lifetime as a jose-compatible string (e.g. '60s', '5m', '1h'). Default: '60s'. */
    ttl?: string;
}): Promise<string>;
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