/**
 * Check if a package is installed
 * @param pack The package to check
 * @returns `true` if the package is installed, `false` otherwise
 */
export declare function isAptPackInstalled(pack: string): Promise<boolean>;
/**
 * Check if a package matching a regexp is installed
 * @param regexp The regexp to check
 * @returns `true` if a package is installed, `false` otherwise
 */
export declare function isAptPackRegexInstalled(regexp: string): Promise<boolean>;