From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jeremy Apthorp <nornagon@nornagon.net>
Date: Mon, 16 Sep 2019 17:50:28 -0400
Subject: fix microtasks

backports https://github.com/nodejs/node/pull/29581 and https://github.com/nodejs/node/pull/29434

diff --git a/src/api/callback.cc b/src/api/callback.cc
index 43ccfafd9f2c85e23a9ea6277e88e4864e287905..3c518870c9c8d92f3dfcd6c270f5e023e3b69633 100644
--- a/src/api/callback.cc
+++ b/src/api/callback.cc
@@ -12,6 +12,7 @@ using v8::HandleScope;
 using v8::Isolate;
 using v8::Local;
 using v8::MaybeLocal;
+using v8::MicrotasksScope;
 using v8::NewStringType;
 using v8::Object;
 using v8::String;
@@ -100,7 +101,7 @@ void InternalCallbackScope::Close() {
 
   if (!env_->can_call_into_js()) return;
   if (!tick_info->has_tick_scheduled()) {
-    env_->isolate()->RunMicrotasks();
+    MicrotasksScope::PerformCheckpoint(env_->isolate());
   }
 
 #if 0  // FIXME(codebytere): figure out why this check fails/causes crash
diff --git a/src/node_task_queue.cc b/src/node_task_queue.cc
index e6b4d0b8e211cdb1fef4759457c2550e28448360..918796ba77d80cf66324164a930f8068e0622ccb 100644
--- a/src/node_task_queue.cc
+++ b/src/node_task_queue.cc
@@ -21,6 +21,7 @@ using v8::kPromiseRejectWithNoHandler;
 using v8::kPromiseResolveAfterResolved;
 using v8::Local;
 using v8::Message;
+using v8::MicrotasksScope;
 using v8::Number;
 using v8::Object;
 using v8::Promise;
@@ -43,7 +44,7 @@ static void EnqueueMicrotask(const FunctionCallbackInfo<Value>& args) {
 bool RunNextTicksNative(Environment* env) {
   TickInfo* tick_info = env->tick_info();
   if (!tick_info->has_tick_scheduled() && !tick_info->has_rejection_to_warn())
-    env->isolate()->RunMicrotasks();
+    MicrotasksScope::PerformCheckpoint(env->isolate());
   if (!tick_info->has_tick_scheduled() && !tick_info->has_rejection_to_warn())
     return true;
 
@@ -54,7 +55,7 @@ bool RunNextTicksNative(Environment* env) {
 }
 
 static void RunMicrotasks(const FunctionCallbackInfo<Value>& args) {
-  args.GetIsolate()->RunMicrotasks();
+  MicrotasksScope::PerformCheckpoint(args.GetIsolate());
 }
 
 static void SetTickCallback(const FunctionCallbackInfo<Value>& args) {