Conflicts with code navigation inside file

_Disclaimer:_ I know the project is not actively maintained. Just filling the issue if anybody would continue with it.

When I has enabled this extension, and DoJo AMD with a class and I cannot navigate among class methods and properties (Go to ... Peek ...):
```js
define(["module1", "module2"], function(module1, module2) {
class SomeClass {
doSomething() { this._doSomethingInner(false); }

_doSomethingInner(param) { ... }
}
}
```
E.g. _Go To Definition (F12)_ does not work on `this._doSomethingInner(false)` call and _Go To Implementation (Ctrl+F12)_ does not work on _doSomethingInner() definition. Etc.