/**
 * Connectivity probe for configured proxies: exercises the real dispatcher
 * (CONNECT tunnel / socks handshake) against a lightweight endpoint without
 * consuming any model quota.
 *
 * Default endpoint is Cloudflare's `cdn-cgi/trace`, whose body contains an
 * `ip=` line — proof the tunnel terminated at a working egress. Tests inject
 * `endpoint` + `fetchImpl` to stay fully offline.
 */
export interface ProbeResult {
    ok: boolean;
    latencyMs: number;
    detail: string;
}
export interface ProbeOptions {
    /** Trace-style endpoint; body must contain "ip=" on success. */
    endpoint?: string;
    timeoutMs?: number;
    /** Test seam: override undici's fetch. */
    fetchImpl?: (url: string, init?: Record<string, unknown>) => Promise<{
        ok: boolean;
        status: number;
        text(): Promise<string>;
    }>;
}
export declare const DEFAULT_PROBE_ENDPOINT = "https://1.1.1.1/cdn-cgi/trace";
export declare function probeProxy(proxyUrl: string, opts?: ProbeOptions): Promise<ProbeResult>;
/** Log-friendly label; never leaks credentials. */
export declare function describeProbeTarget(proxyUrl: string): string;
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