I am starting to learn angular2
and I happened to clone the Angular 2 Quickstart from github
Now, what I noticed is that, some of the statements in typescript files are shown as errors in Visual Studio, but they actually work
I checked a similar question which was resolved by installing MVC4 in the machine.
What should I install/do to fix this?
In my experience Visual Studio is a bit unstable with regards to this on-the-fly sync and compile. What helped me is just a simple restarting of Visual Studio (if all other stuff is in order).
If that does not help, it's better to update TypeScript to latest version. I do it first thing in Visual Studio. You cannot do it directly from extension tab unfortunately, so you need to download it from MS site.
P.S. The Url might change later of course if new versions are released.