title: Visual Studio 2015 typescript "public readonly name: type" marked as error
body: <p>In Visual Studio 2015, if i write a .ts file with:</p>
  
  <pre><code>class MyClass {
      public pageSize: number;
  }
  </code></pre>
  
  <p>no errors are marked (underlined).
  If i write instead</p>
  
  <pre><code>class MyClass1 {
      public readonly pageSize: number;
  }
  </code></pre>
  
  <p>i get weird underlines, but the code compiles.
  Any clue?</p>
  
  <p>Thanks </p>
  
  <p><a href="https://i.stack.imgur.com/vpZg9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vpZg9.png" alt="enter image description here"></a></p>