/**
 * Determines the appropriate cache directory for the current platform.
 *
 * Follows platform-specific conventions:
 * - Windows: %LOCALAPPDATA%\Cache\inference-server
 * - macOS: ~/Library/Caches/inference-server
 * - Linux: $XDG_CACHE_HOME/inference-server or ~/.cache/inference-server
 *
 * @param {string} subDir - The name of the cache subdirectory
 * @returns {string} The absolute path to the cache directory
 */
export declare function getCacheDirPath(subDir?: string): string;