void a(const FunctionCallbackInfo<Value>& args) {
  Isolate* isolate = args.GetIsolate();
  auto context = isolate->GetCurrentContext();

  for (int i = 0; i < args.Length(); i++)
  {
    if (args[i]->IsNumber())
    {
      if (args[i]->IsInt32())
      {
        printf("[%d] int\n", i);
      }
      else {
        printf("[%d] float\n", i);
      }
    }

    if (args[i]->IsString())
    {
      printf("[%d] string\n", i);
    }


    if (args[i]->IsObject())
    {
      if (args[i]->IsArray())
      {
        printf("[%d] array\n", i);
      }
      else if (args[i]->IsAsyncFunction())
      {
        printf("[%d] async function\n", i);
      }
      else if (args[i]->IsGeneratorFunction())
      {
        printf("[%d] gener function\n", i);
      }
      else if (args[i]->IsFunction())
      {
        printf("[%d] function\n", i);
      }
      else
      {
        printf("[%d] object({})\n", i);
      }
    }

    if (args[i]->IsBoolean())
    {
      printf("[%d] bool\n", i);
    }

    if (args[i]->IsNullOrUndefined())
    {
      printf("[%d] null or undefided\n", i);
    }

    args.GetReturnValue().Set(Number::New(isolate, 1));
  }
}

let r = addon.a(
  1,
  2.2,
  "2",
  true,
  () => {},
  null,
  undefined,
  async function fname() {},
  [],
  {}
);

console.log(r);

打印结果

[0] int
[1] float
[2] string
[3] bool
[4] function
[5] null or undefided
[6] null or undefided
[7] async function
[8] array
[9] object({})
1

v8 常用js类型