/**
 * TLS material for mutual TLS authentication
 */
export interface MtlsOptions {
    /** PEM-encoded client certificate */
    cert: string;
    /** PEM-encoded client private key */
    key: string;
    /** PEM-encoded CA certificate (replaces system trust store) */
    ca: string;
}
/**
 * Creates a fetch function that performs mutual TLS authentication.
 *
 * The returned function has the standard `typeof fetch` signature and can be
 * injected into the generated API client via its `fetch` config option.
 *
 * Internally it creates an undici Agent with the provided TLS material and
 * uses it as the dispatcher for every request. The agent is created once
 * and reused across all requests, keeping connections pooled.
 *
 * @param options - TLS certificate material
 * @returns A fetch-compatible function that presents client certs on TLS handshake
 */
export declare function createMtlsFetch(options: MtlsOptions): typeof fetch;