export declare class RpcError extends Error {
    readonly code: number;
    readonly data?: unknown | undefined;
    constructor(message: string, code: number, data?: unknown | undefined);
}
export interface JsonRpcRequest {
    jsonrpc: '2.0';
    id: number;
    method: string;
    params?: Record<string, unknown>;
}
export interface JsonRpcResponse {
    jsonrpc: '2.0';
    id: number;
    result?: unknown;
    error?: {
        code: number;
        message: string;
        data?: unknown;
    };
}
export declare class RpcClient {
    private url;
    private requestTimeout;
    private ws;
    private nextId;
    private pending;
    private connectionPromise;
    constructor(url: string, requestTimeout?: number);
    connect(): Promise<void>;
    call<T = unknown>(method: string, params?: Record<string, unknown>): Promise<T>;
    disconnect(): Promise<void>;
    get isConnected(): boolean;
    private handleMessage;
}
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