feat: expose PerformMicrotaskCheckpoint (#133)

Author: edusperoni

NativeScript/runtime/Runtime.h

@@ -55,6 +55,7 @@ class Runtime {
     void DefineNativeScriptVersion(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> globalTemplate);
     void DefinePerformanceObject(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> globalTemplate);
     void DefineTimeMethod(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> globalTemplate);
+    void DefineDrainMicrotaskMethod(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> globalTemplate);
     static void PerformanceNowCallback(const v8::FunctionCallbackInfo<v8::Value>& args);
     v8::Isolate* isolate_;
     std::unique_ptr<ModuleInternal> moduleInternal_;

NativeScript/runtime/Runtime.mm

@@ -93,6 +93,7 @@
     Worker::Init(isolate, globalTemplate, mainThreadInitialized_);
     DefinePerformanceObject(isolate, globalTemplate);
     DefineTimeMethod(isolate, globalTemplate);
+    DefineDrainMicrotaskMethod(isolate, globalTemplate);
     ObjectManager::Init(isolate, globalTemplate);
 //    SetTimeout::Init(isolate, globalTemplate);
     MetadataBuilder::RegisterConstantsOnGlobalObject(isolate, globalTemplate, mainThreadInitialized_);
@@ -230,6 +231,13 @@
     globalTemplate->Set(ToV8String(isolate, "__time"), timeFunctionTemplate);
 }
 
+void Runtime::DefineDrainMicrotaskMethod(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> globalTemplate) {
+    Local<FunctionTemplate> drainMicrotaskTemplate = FunctionTemplate::New(isolate, [](const FunctionCallbackInfo<Value>& info) {
+        info.GetIsolate()->PerformMicrotaskCheckpoint();
+    });
+    globalTemplate->Set(ToV8String(isolate, "__drainMicrotaskQueue"), drainMicrotaskTemplate);
+}
+
 bool Runtime::IsAlive(Isolate* isolate) {
     return std::find(Runtime::isolates_.begin(), Runtime::isolates_.end(), isolate) != Runtime::isolates_.end();
 }