/**
 * XDG_CACHE_HOME environment variable.
 * XDG Base Directory specification cache directory.
 */
export declare function getXdgCacheHome(): string | undefined;
/**
 * XDG_CONFIG_HOME environment variable.
 * XDG Base Directory specification config directory.
 */
export declare function getXdgConfigHome(): string | undefined;
/**
 * XDG_DATA_HOME environment variable.
 * Points to the user's data directory on Unix systems.
 */
export declare function getXdgDataHome(): string | undefined;
