/**
 * Authentication Handler
 *
 * Handles API authentication using Bearer token in Authorization header.
 * All CleanSlate API requests require authentication.
 */
/**
 * Configuration for authentication
 */
export interface AuthConfig {
    /**
     * CleanSlate API key
     */
    apiKey: string;
}
/**
 * Creates authentication headers for API requests
 *
 * @param config - Authentication configuration
 * @returns Headers object with Authorization header
 * @throws {AuthenticationError} If API key is missing or invalid
 */
export declare function createAuthHeaders(config: AuthConfig): Record<string, string>;
/**
 * Validates that an API key is properly formatted
 *
 * @param apiKey - API key to validate
 * @returns true if valid
 * @throws {AuthenticationError} If API key is invalid
 */
export declare function validateApiKey(apiKey: string): boolean;
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