/**
 * The update notice, in the shape npm's update-notifier, gh, and vercel use:
 * read the registry's dist-tag at most once a day, cache it beside the config,
 * never block or fail the command on it, and print one notice on stderr.
 */
export declare const PACKAGE_NAME = "relaymessenger";
export declare const CHECK_INTERVAL_MS: number;
export declare const CHECK_TIMEOUT_MS = 1500;
export interface UpdateCheck {
    /** The installed version. */
    version: string;
    /** The dist-tag compared against: `staging` for a staging build, else `latest`. */
    tag: "latest" | "staging";
    /** The newest version from a fresh cache, known before any network call. */
    cached: string | undefined;
    /** The newest version, from the cache or the registry; undefined when unknown. */
    latest: Promise<string | undefined>;
}
export interface UpdateCheckOptions {
    version: string;
    cacheFile: string;
    env?: NodeJS.ProcessEnv;
    fetch?: typeof globalThis.fetch;
    now?: () => number;
    timeoutMs?: number;
}
export declare const distTagFor: (version: string) => "latest" | "staging";
/** True when `installed` is older than `latest`; false when either is unreadable. */
export declare const isOutdated: (installed: string, latest: string) => boolean;
export declare const startUpdateCheck: (options: UpdateCheckOptions) => UpdateCheck;
/** How a person was running this copy: from npx's cache, or an install of their own. */
export declare const ranFromNpx: (script?: string | undefined) => boolean;
/** The lines that tell a person this copy is old and exactly what to run instead. */
export declare const updateNotice: (check: Pick<UpdateCheck, "version" | "tag">, latest: string, argv: readonly string[], fromNpx?: boolean) => string;
/** A refusal that says the route this copy called is gone: 404 or 410. */
export declare const staleRouteStatus: (error: unknown) => boolean;
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