import type { MeshEnvelope } from "./types.js";
/**
 * HTTP client for the relay's `/mesh/<owner_pk_hash>` endpoints.
 *
 * Uses Node 20+ global `fetch` — no extra dependency. The constructor
 * expects the **canonical http(s):// form** of the relay URL — the same
 * value returned by `resolveRelayUrl()`. No scheme conversion is done
 * here; ws(s):// URLs would be passed through to `fetch` and fail.
 *
 * Spec: plan/24-mesh-membership.md "API HTTP" section.
 */
export declare class MeshClient {
    private readonly baseUrl;
    constructor(relayUrl: string);
    /**
     * `GET /mesh/<hash>?since=<version>`.
     *
     * `hash` is `sha256(owner_pk)` encoded as **lowercase hex** — the format
     * the relay stores and the app publishes. Mismatched encodings yield a
     * silent 404 forever.
     *
     * Status mapping:
     *   - 200 → returns a `MeshEnvelope` with base64-decoded `blob` and `sig`.
     *   - 304 / 404 → returns `null` (caller treats as "no update" or "owner
     *     never published").
     *   - Anything else → throws (caller logs + continues).
     *
     * Malformed 200 responses (missing fields, non-string blob/sig) also throw.
     */
    get(hash: string, since?: number): Promise<MeshEnvelope | null>;
}