When looking around for example applications that use Mobx 5.x combined with Mobx-react 5.x and TypeScript 3.x I did not find any useful example. Most of the examples in the awesome mobx list reference Mobx 3.x and are really outdated.
In my example I will use MOBX to display "Hello World!". It should showcase a couple of core concepts you will be using in an mobx application.
Read More about this example here.