C++ function returning an ES6 promise

Demo.cpp

#include <node.h>

#include "Test.h"

namespace demo {

using v8::FunctionCallbackInfo;
using v8::Isolate;
using v8::Local;
using v8::Object;
using v8::String;
using v8::Value;

void Method(const FunctionCallbackInfo<Value> &args) {
  Isolate *isolate = args.GetIsolate();
  auto resolver = v8::Promise::Resolver::New(isolate);
  args.GetReturnValue().Set(resolver->GetPromise());
  resolver->Resolve(String::NewFromUtf8(isolate, "world"));
}

void init(Local<Object> exports) { NODE_SET_METHOD(exports, "hello", Method); }

NODE_MODULE(addon, init)

} // namespace demo

demo.js

let addon = require('./build/Release/webidl-poc.node')
addon.hello().then(msg => console.log(msg))