One of the reasons that static tooling with JS (intellisense, static analysis, go to definition) lags behind those for other languages is the lack of consistent

One of the reasons that static tooling with JS (intellisense, static analysis, go to definition) lags behind those for other languages is the lack of consistent class syntax. Some explicitly create prototypes, some simply attach closures to `this`, and yet many others create their own utility routines to create and extend classes. This makes it incredibly hard to analyze the code structure and infer the methods and properties a certain instance may hold. ES6 may help with this, but it will be a long time before ES6 are natively supported and ES6 class syntax are adopted among devs.