/**
 * Refresh the update cache in a silent detached worker for future runs.
 * The worker never writes to the terminal (stdio is always ignored), so it
 * cannot interleave output with the parent CLI.
 */
export declare function startUpdateCheckWorker(): void;
/**
 * Run the update check: notify any cached update from the parent process
 * (preserving the pre-worker notification contract), then refresh the cache
 * in the background. The notification must consume the cache before the
 * worker starts so the two never race for the same cache entry.
 * Every step is best-effort: an update-check failure must never take down
 * the CLI itself.
 */
export declare function runUpdateCheck(currentVersion: string): Promise<void>;
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