/**
 * Configuration Loader
 * Unified configuration loading from multiple sources with priority:
 * CLI args > Environment variables > Config file > Defaults
 *
 * v4.2.0: 默认路径改全局 ~/.universal-db-mcp/ — cwd 相对 fallback 已移除
 */
import type { AppConfig } from '../types/http.js';
export declare function loadFromEnv(): Partial<AppConfig>;
/**
 * Merge multiple configuration objects with priority
 */
export declare function mergeConfigs(...configs: Partial<AppConfig>[]): AppConfig;
/**
 * Load complete configuration
 */
export declare function loadConfig(): AppConfig;
/**
 * Validate configuration
 */
export declare function validateConfig(config: AppConfig): void;
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