/**
 * Configuration management system with validation
 * Loads configuration from environment variables and config file
 */
import type { Config } from '../types/index.js';
/**
 * Current schema version
 */
export declare const SCHEMA_VERSION = "1.0.0";
/**
 * Default configuration values
 */
export declare const DEFAULT_CONFIG: Config;
/**
 * Configuration validation error
 */
export declare class ConfigValidationError extends Error {
    errors: any[];
    constructor(message: string, errors: any[]);
}
/**
 * Load and validate configuration
 *
 * Configuration is loaded in the following order (later sources override earlier ones):
 * 1. Default values
 * 2. Configuration file from default location (~/.knowledge-base/config.json) if it exists
 * 3. Configuration file (if explicitly provided via configPath parameter)
 * 4. Environment variables
 *
 * Also ensures required directories exist and creates default config if needed.
 *
 * @param configPath - Optional path to configuration file (overrides default location)
 * @returns Validated configuration object
 * @throws ConfigValidationError if configuration is invalid
 */
export declare function loadConfig(configPath?: string): Config;
/**
 * Validate a configuration object without loading from file/env
 * Useful for testing
 */
export declare function validateConfigObject(config: unknown): config is Config;
/**
 * Get validation errors for a configuration object
 */
export declare function getConfigValidationErrors(config: unknown): string[];
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