export declare function installedVersion(): string | null;
/** -1 / 0 / 1 on the numeric parts only; pre-release tags are ignored. */
export declare function cmpSemver(a: string, b: string): number;
/**
 * Returns the notice text when a newer version is published, otherwise null.
 * Never throws.
 */
export declare function updateNotice(opts?: {
    installed?: string | null;
    timeoutMs?: number;
}): Promise<string | null>;
/** Fire-and-forget: prints to stderr if there is something to say. */
export declare function announceUpdate(): void;
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