/**
 * Update-check notifier.
 *
 * Kicks off an async version check at CLI entry, then prints a one-line notice
 * to stderr after the user's command completes — but only if the check has
 * already resolved by then. The user's command is never delayed.
 */
import { type ReleaseInfo } from "./check.js";
export interface NotifierOptions {
    isTty?: boolean;
    env?: NodeJS.ProcessEnv;
    currentVersion?: string;
    getLatest?: () => Promise<ReleaseInfo | null>;
    output?: NodeJS.WritableStream;
    /** When true, suppress the check (e.g. user passed `--no-update-check`). */
    noUpdateCheck?: boolean;
}
/**
 * Kicks off the async update check. Returns a promise that resolves once the
 * check is done (or immediately, if the check was suppressed). Production
 * callers typically ignore the returned promise; tests can await it.
 */
export declare function maybeStartUpdateCheck(command: string, options?: NotifierOptions): Promise<void>;
/**
 * Returns true when `latest` is strictly newer than `current` per semver
 * precedence. Falls back to plain inequality when either side is unparseable,
 * matching the old "notify on any mismatch" behavior for exotic versions.
 */
export declare function isNewerVersion(latest: string, current: string): boolean;
export declare function flushUpdateNotice(): void;
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