title: vue composition api toRefs typescript
body: <p>How to get proper type when creating a ref for props? I have tried like this</p>
  <pre><code>setup(props) {
      const { userId } = toRefs(props); // userId is string
      retrun {
          ...getComposition(userId);
      };
  }
  
  ...
  function getComposition(userId) {
      // How to make sure that userId.value is string?)
      const caps = userId.value.toUperCase(); // here how to get string method hints
  }
  </code></pre>