/**
 * Update-check cache + GitHub Releases API client.
 *
 * Fetches the latest release tag from GitHub and caches the result for 24 hours
 * at `{data}/update-check.json`. Network/parse failures are swallowed (returns null)
 * so the caller can ignore them silently.
 */
export interface ReleaseInfo {
    checkedAt: string;
    latest: string;
    url: string;
}
export interface GetLatestVersionOptions {
    force?: boolean;
    cachePath?: string;
    fetch?: typeof globalThis.fetch;
    now?: () => Date;
    ttlMs?: number;
    /** Abort the HTTP request after this many milliseconds. */
    timeoutMs?: number;
}
/**
 * Timeout for explicit `ref upgrade` runs: the user asked for the network
 * round-trip, so a slow connection deserves more patience than the notifier.
 */
export declare const EXPLICIT_UPGRADE_TIMEOUT_MS = 30000;
export declare function getLatestVersion(options?: GetLatestVersionOptions): Promise<ReleaseInfo | null>;
//# sourceMappingURL=check.d.ts.map