export declare class HostManagerUnreachableError extends Error {
    readonly cause: unknown;
    constructor(attempts: number, cause: unknown);
}
/**
 * Undici reports every network failure as `TypeError: fetch failed` and hides
 * the actual reason (ECONNRESET, EAI_AGAIN, ...) in the error's cause chain,
 * so surface it in the message.
 */
export declare function describeNetworkError(error: unknown): string;