export declare class RPCError extends Error {
    readonly code?: number | undefined;
    readonly data?: unknown | undefined;
    constructor(message: string, code?: number | undefined, data?: unknown | undefined);
}
export declare class BackendError extends RPCError {
    constructor(message: string, code: number, data?: unknown);
}
export declare class NetworkError extends RPCError {
    constructor(message: string, code?: number);
}