/**
 * Configuration manager for the Agentis framework
 */
export declare class ConfigManager {
    private static instance;
    private config;
    private logger;
    /**
     * Private constructor (use getInstance() instead)
     */
    private constructor();
    /**
     * Gets the singleton instance of the config manager
     *
     * @returns The config manager instance
     */
    static getInstance(): ConfigManager;
    /**
     * Gets a configuration value
     *
     * @param key - The key to get
     * @param defaultValue - Default value if not found
     * @returns The configuration value, or defaultValue if not found
     */
    get<T>(key: string, defaultValue?: T): T;
    /**
     * Sets a configuration value
     *
     * @param key - The key to set
     * @param value - The value to set
     */
    set(key: string, value: any): void;
    /**
     * Checks if a configuration value exists
     *
     * @param key - The key to check
     * @returns Boolean indicating if the key exists
     */
    has(key: string): boolean;
    /**
     * Gets all configuration values
     *
     * @returns All configuration values
     */
    getAll(): Record<string, any>;
    /**
     * Loads configuration from a file
     *
     * @param filePath - Path to the configuration file
     * @returns Boolean indicating if loading was successful
     */
    loadFromFile(filePath: string): boolean;
    /**
     * Loads environment variables from .env file
     */
    private loadEnvironmentVariables;
}