/**
 * update-state — sticky persistence for the "update available" notice.
 *
 * `update-notifier` is a good *fetcher* (throttled — hourly here — detached
 * background network check) but a poor *display* source: its `check()`
 * deletes the cached result the instant it's read, so the notice would show
 * at most once per fetch cycle. A user who blinks past one `fit` run would
 * never see it again until the next hourly check repopulated the cache.
 *
 * This module owns the display state instead. The update notifier mirrors the
 * newest known published version here; {@link readKnownLatest} is consulted on
 * EVERY run so the notice persists, and {@link clearKnownLatest} wipes it the
 * moment the running version catches up — so it stops on its own after an
 * upgrade, with no stale "update available" lingering.
 *
 * The store is a tiny JSON file at `~/.opensip-cli/update-state.json`
 * (see {@link resolveUserPaths}), kept separate from the user-authored
 * `config.yml`. Writes require entered user-state ownership (Task 4.6) so a
 * detached callback cannot mutate user-root state after global uninstall
 * starts. Reads remain best-effort.
 */
/** Default store path: `~/.opensip-cli/update-state.json`. */
export declare function defaultUpdateStateFile(): string;
/**
 * Read the last-known newer published version, or `undefined` when nothing is
 * cached / the file is absent or unreadable. Never throws. Reads do not
 * require ownership (display-only).
 */
export declare function readKnownLatest(file?: string): string | undefined;
/**
 * Persist the newest known published version so the notice survives across
 * runs. Requires entered user-state ownership. No-ops on I/O failure after
 * authorization succeeds. Skips the write when the value is unchanged.
 */
export declare function writeKnownLatest(latest: string, file?: string): void;
/**
 * Clear the cached version — called once the running version catches up.
 * Requires entered user-state ownership. No-ops when already absent or on I/O failure.
 */
export declare function clearKnownLatest(file?: string): void;
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