/**
 * Configuration Management Module
 *
 * Provides centralized configuration management with environment variable
 * support, validation, and default values for the Firefox Relay MCP Server.
 * Follows golden-standard programming practices for maximal reliability.
 */
import { McpServerConfig } from '../types';
/**
 * Configuration manager class
 *
 * Validates and provides access to application configuration with support
 * for environment variables, defaults, and runtime overrides.
 */
export declare class Configuration {
    private static instance;
    private readonly config;
    /**
     * Private constructor - use getInstance() instead
     */
    private constructor();
    /**
     * Get the singleton configuration instance
     */
    static getInstance(env?: NodeJS.ProcessEnv, overrides?: Partial<McpServerConfig>): Configuration;
    /**
     * Reset the singleton instance (useful for testing)
     */
    static resetInstance(): void;
    /**
     * Create a new configuration instance (useful for testing)
     */
    static create(env?: NodeJS.ProcessEnv, overrides?: Partial<McpServerConfig>): Configuration;
    /**
     * Get the full configuration object
     */
    getConfig(): Readonly<McpServerConfig>;
    /**
     * Get a specific configuration value by key
     */
    get<T extends keyof McpServerConfig>(key: T): McpServerConfig[T];
    /**
     * Check if a configuration value exists and is truthy
     */
    has<T extends keyof McpServerConfig>(key: T): boolean;
    /**
     * Get configuration as a plain object (for serialization)
     */
    toJSON(): Record<string, unknown>;
    /**
     * Validate that required configuration is present
     */
    validateRequired(): void;
    /**
     * Get environment variable names that can be set
     */
    static getEnvironmentVariableNames(): string[];
    /**
     * Generate a sample .env file content
     */
    static generateEnvFile(): string;
}
/**
 * Default configuration export
 *
 * Use Configuration.getInstance() for the singleton pattern,
 * or Configuration.create() for isolated instances.
 */
export declare const config: Configuration;
export default Configuration;
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