/**
 * Configuration system for Lex.
 * Provides centralized configuration loading with environment variable overrides.
 *
 * Precedence:
 * 1. Environment variables (LEX_APP_ROOT, LEX_DB_PATH, LEX_POLICY_PATH)
 * 2. .lex.config.json file
 * 3. Sensible defaults
 */
/**
 * Configuration structure for Lex application.
 */
export interface LexConfig {
    paths: {
        /** Application root directory - used for path resolution */
        appRoot: string;
        /** Database file path (relative to appRoot if not absolute) */
        database: string;
        /** Policy file path (relative to appRoot if not absolute) */
        policy: string;
    };
}
/**
 * Load and return the application configuration.
 * Configuration is loaded once and cached for subsequent calls.
 *
 * Priority order:
 * 1. Environment variables (LEX_APP_ROOT, LEX_DB_PATH, LEX_POLICY_PATH)
 * 2. .lex.config.json file in project root
 * 3. Default values
 *
 * @returns The resolved configuration
 */
export declare function loadConfig(): LexConfig;
/**
 * Reset the cached configuration (useful for testing).
 * @internal
 */
export declare function resetConfig(): void;
/**
 * Get the application root directory.
 * Convenience function for accessing the most commonly used config value.
 */
export declare function getAppRoot(): string;