import { BaseError } from 'viem';
/**
 * Error thrown when WebSocket connection fails
 */
export declare class WebSocketConnectionError extends BaseError {
    constructor(message: string);
}
/**
 * Error thrown when WebSocket subscription fails
 */
export declare class WebSocketSubscriptionError extends BaseError {
    constructor(message: string);
}
/**
 * Error thrown when waiting for data times out
 */
export declare class WebSocketTimeoutError extends BaseError {
    constructor(message: string);
}
/**
 * Helper function to detect WebSocket-specific errors
 * Used to determine whether to fall back to HTTP polling
 */
export declare function isWebSocketError(error: unknown): boolean;
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