/**
 * Shared gsk-mesh "what's the latest release" probe against the backend.
 *
 * Extracted from upgrade.ts so BOTH the explicit `gsk mesh upgrade` path AND
 * first-run download (download.ts::ensureMeshBinary) can ask the backend for the
 * current release — without a circular import (upgrade.ts imports download.ts,
 * and download.ts now needs this probe).
 *
 * Endpoint (gen-spark#32059):
 *   GET {base}/api/gsk-mesh/checkupdate/{target}?channel=stable|beta
 *       &current_version=<installed>
 *   → 200 {version, sha256, url, notes}  (update / latest available)
 *   → 204                                 (already latest / none promoted)
 *
 * Pass currentVersion=null to always get the channel's latest (first-run /
 * `--force`). Auth is optional: the probe frequently fires unauthenticated, so
 * the bearer token is sent only when present.
 */
import { type MeshTarget } from './manifest.js';
export interface CheckUpdateResponse {
    version: string;
    sha256: string;
    url: string;
    notes?: string;
}
/**
 * Resolve the backend base URL the gsk-mesh endpoint is served from.
 *
 * Priority: explicit CLI override > GSK_BASE_URL env > config file > PROD
 * default. Falls back to PROD rather than gsk's localhost dev default because
 * the gsk-mesh binaries + endpoint are production-served.
 */
export declare function resolveBaseUrl(override?: string): string;
/**
 * Query the backend for the latest gsk-mesh release for `target` + `channel`.
 * Returns the manifest (200), null (204 / no update), or throws on transport /
 * HTTP errors.
 */
export declare function fetchCheckUpdate(target: MeshTarget, channel: 'stable' | 'beta', currentVersion: string | null, baseUrlOverride?: string): Promise<CheckUpdateResponse | null>;
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