import { Config } from './types';
/**
 * Error thrown when configuration validation fails
 */
export declare class ConfigurationError extends Error {
    constructor(message: string);
}
/**
 * Loads and validates configuration from environment variables
 * @returns Validated configuration object
 * @throws {ConfigurationError} If configuration is invalid or missing required values
 */
export declare function loadConfig(): Config;
/**
 * Validates the configuration object
 * @param config - Configuration to validate
 * @throws {ConfigurationError} If configuration is invalid
 */
export declare function validateConfig(config: Config): void;
/**
 * Gets configuration from arguments with environment variable fallback
 * @param args - Optional configuration arguments
 * @returns Validated configuration object
 * @throws {ConfigurationError} If configuration is invalid
 */
export declare function getConfigFromArgs(args?: Record<string, unknown>): Config;
/**
 * Masks an API key for safe display in logs
 * @param apiKey - The API key to mask
 * @returns Masked API key showing only first 4 and last 4 characters
 */
export declare function maskApiKey(apiKey: string): string;
/**
 * Gets a human-readable summary of the configuration
 * @param config - Configuration object
 * @returns Formatted configuration summary with masked sensitive data
 */
export declare function getConfigSummary(config: Config): string;
//# sourceMappingURL=config.d.ts.map