import type * as https from 'node:https';
import type { IoHelper } from '../api-private';
export declare class VersionCheckTTL {
    static timestampFilePath(): string;
    private readonly file;
    private readonly ttlSecs;
    constructor(file?: string, ttlSecs?: number);
    hasExpired(): Promise<boolean>;
    update(latestVersion?: string): Promise<void>;
}
export declare function getVersionMessages(currentVersion: string, cacheFile: VersionCheckTTL, agent?: https.Agent): Promise<string[]>;
export declare function shouldDisplayVersionMessage(): boolean;
/**
 * Options for {@link displayVersionMessage}
 */
export interface DisplayVersionMessageOptions {
    /**
     * The version of the CLI that is currently running
     *
     * @default - the version of this package
     */
    readonly currentVersion?: string;
    /**
     * The cache used to limit how often the version check runs
     *
     * @default - a TTL cache in the CDK cache directory
     */
    readonly versionCheckCache?: VersionCheckTTL;
    /**
     * The agent used for the network request to the npm registry
     *
     * Use this to set up a proxy connection.
     *
     * @default - the shared global node agent
     */
    readonly agent?: https.Agent;
}
export declare function displayVersionMessage(ioHelper: IoHelper, options?: DisplayVersionMessageOptions): Promise<void>;