! suffix breaks invoked member highlighting

**[TS and JS Grammar Extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode.typescript-javascript-grammar) version:**  0.0.52 / latest

![image](https://user-images.githubusercontent.com/10508071/66170513-5fe56f80-e5f9-11e9-930d-ce051bf26a4a.png)
![image](https://user-images.githubusercontent.com/10508071/66170542-7db2d480-e5f9-11e9-814f-a5513389cc05.png)
