export interface VersionCheckResult {
    currentVersion: string;
    latestVersion: string | null;
    hasUpdate: boolean;
    checked: boolean;
}
/**
 * Compare two semver version strings.
 * Returns a positive number if a > b, negative if a < b, 0 if equal.
 */
export declare function compareVersions(a: string, b: string): number;
/**
 * Get the current installed Comet version from package.json.
 */
export declare function getCurrentVersion(): string;
/**
 * Fetch the latest version from the npm registry.
 * Returns null if the registry is unreachable or the request fails.
 */
export declare function getLatestVersion(): Promise<string | null>;
/**
 * Check for available updates.
 * Silently returns a "not checked" result if the registry is unreachable.
 */
export declare function checkForUpdate(): Promise<VersionCheckResult>;
/**
 * Format and print version info to the console.
 * Used by `comet init` and `comet update` at the start of command output.
 */
export declare function printVersionInfo(log: (message: string) => void): Promise<VersionCheckResult>;
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