/**
 * npm registry lookup for the latest published version.
 */
/**
 * Fetches the latest published version of any npm package.
 * Returns null on any failure — never throws.
 */
export declare function fetchLatestVersionFor(packageName: string, userAgentVersion: string): Promise<null | string>;
/**
 * Fetches the latest published version of @windagency/valora from the npm
 * registry. Returns null on any failure — never throws.
 */
export declare function fetchLatestVersion(currentVersion: string): Promise<null | string>;
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