/**
 * Configuration Module
 *
 * Handles loading and validation of environment variables.
 * All secrets are loaded from environment variables only.
 */
export type LogLevel = "debug" | "info" | "notice" | "warning" | "error" | "critical";
export interface ServerConfig {
    botToken: string;
    logLevel: LogLevel;
    requestTimeout: number;
    maxRetries: number;
    rateLimitPerMinute: number;
    webhookUrl?: string;
    webhookSecret?: string;
    webhookPort?: number;
    healthPort?: number;
    debug: boolean;
}
export declare class ConfigurationError extends Error {
    constructor(message: string);
}
/**
 * Load configuration from environment variables.
 * Validates all required values and provides sensible defaults.
 *
 * @throws ConfigurationError if required values are missing or invalid
 */
export declare function loadConfig(): ServerConfig;
/**
 * Get current configuration.
 * Throws if config hasn't been loaded yet.
 */
export declare function getConfig(): ServerConfig;
/**
 * Clear cached configuration (useful for testing)
 */
export declare function clearConfigCache(): void;
/**
 * Mask sensitive values for logging
 */
export declare function getSafeConfigForLogging(): Record<string, unknown>;
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