export declare function npmMostRecentMatching(packageName: string, range: string): Promise<any>;
export declare function npmQueryInstalledVersion(packageName: string, dir: string): Promise<any>;
/**
 * Use NPM preinstalled on the machine to look up a list of TypeScript versions
 */
export declare function typescriptVersionsSync(): string[];
/**
 * Use NPM preinstalled on the machine to query publish times of versions
 */
export declare function typescriptVersionsYoungerThanDaysSync(days: number, versions: string[]): string[];