isJsonRpcRequest function
Implementation
bool isJsonRpcRequest(dynamic payload) {
  return payload is JsonRpcRequest ||
      (payload is Map &&
          isJsonRpcPayload(payload) &&
          payload.containsKey('method'));
}bool isJsonRpcRequest(dynamic payload) {
  return payload is JsonRpcRequest ||
      (payload is Map &&
          isJsonRpcPayload(payload) &&
          payload.containsKey('method'));
}