/**
 * Build a `fetch` implementation that tunnels through an HTTP/HTTPS proxy
 * when one is configured via the standard proxy env vars (`HTTPS_PROXY`,
 * `HTTP_PROXY`, `ALL_PROXY`, honoring `NO_PROXY`).
 *
 * Node's built-in `fetch` (and therefore MCP's `StreamableHTTPClientTransport`)
 * does not honor `HTTPS_PROXY` / `HTTP_PROXY` on its own. Callers that need
 * proxied egress should pass the result as the transport's `fetch` option.
 *
 * Returns `undefined` when no proxy applies, so the caller can keep the
 * default global `fetch`.
 */
export declare const getProxyFetch: (targetUrl: string) => ((url: string | URL, init?: RequestInit) => Promise<Response>) | undefined;
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