/**
 * Latest version already sitting in the on-disk cache. No network. Undefined
 * when the check is disabled or nothing has been fetched yet — the header
 * then simply omits the outdated-CLI issue rather than guessing.
 */
export declare function cachedLatestVersion(): string | undefined;
/**
 * Refresh the registry cache at most once per 24h. Returns the latest version
 * we now know about, so a caller that is about to render setup issues (the
 * palette) can put an outdated CLI in that list instead of printing a footer
 * after the fact.
 *
 * Stays silent on non-TTY stderr (scripts/CI), when disabled via
 * `CARGO_NO_UPDATE_NOTIFIER`, and on any network/parse failure — it must
 * never block, delay, or break the command that triggered it.
 */
export declare function maybeRefreshUpdateCache(): Promise<string | undefined>;
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