/**
 * Enhanced error classes for SSE client
 */
export declare class SSEError extends Error {
    readonly code: string;
    readonly statusCode?: number;
    readonly isRetryable: boolean;
    readonly details?: any;
    constructor(message: string, code: string, statusCode?: number, isRetryable?: boolean, details?: any);
}
export declare class ConnectionError extends SSEError {
    constructor(message: string, statusCode?: number, details?: any);
}
export declare class TimeoutError extends SSEError {
    constructor(details?: any, message?: string);
}
export declare class ParseError extends SSEError {
    constructor(message: string, details?: any);
}
export declare class ValidationError extends SSEError {
    constructor(message: string, details?: any);
}