export interface UpdateCheckOptions {
    configDir: string;
    currentVersion: string;
    now?: number;
    timeoutMs?: number;
    cacheMaxAgeMs?: number;
    noUpdateCacheMaxAgeMs?: number;
    forceRefresh?: boolean;
    fetchImpl?: typeof fetch;
}
export interface UpdateNotice {
    currentVersion: string;
    latestVersion: string;
    command: string;
}
export declare function shouldSkipCliUpdateCheck(env?: NodeJS.ProcessEnv): boolean;
export declare function formatUpdateNotice(notice: UpdateNotice): string;
export declare function checkForCliUpdate(options: UpdateCheckOptions): Promise<UpdateNotice | null>;
export declare function startCliUpdateCheck(options: UpdateCheckOptions & {
    onNotice?: (message: string) => void;
}): void;
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