From 843d0630377d4e29d0d14304035a4b044259fb4e Mon Sep 17 00:00:00 2001
From: murgatroid99 <mlumish@google.com>
Date: Fri, 5 Jan 2018 13:09:15 -0800
Subject: [PATCH] Add JS error for missing callback to sever#tryShutdown

---
 packages/grpc-native-core/ext/server.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/grpc-native-core/ext/server.cc b/packages/grpc-native-core/ext/server.cc
index c6ab5e189..d5b4763b3 100644
--- a/packages/grpc-native-core/ext/server.cc
+++ b/packages/grpc-native-core/ext/server.cc
@@ -312,6 +312,9 @@ NAN_METHOD(Server::TryShutdown) {
   if (!HasInstance(info.This())) {
     return Nan::ThrowTypeError("tryShutdown can only be called on a Server");
   }
+  if (!info[0]->IsFunction()) {
+    return Nan::ThrowError("tryShutdown's argument must be a callback");
+  }
   Server *server = ObjectWrap::Unwrap<Server>(info.This());
   if (server->wrapped_server == NULL) {
     // Server is already shut down. Call callback immediately.