This package provides fundumentals that a .net developer may miss while working with Typescript, whether they are missing functinalities or funcionalities provided in a non-elegant design in javascript. Bad naming, bad design of optional parameters, non-clear effect on the object after running the method are some examples of non-elegant design. Library as well includes delegates like Func<T,TReturn>, Func<T,T,TReturn> ... etc and Action<T>, Action<T,T> ... etc to well describe that passed function. It provides List<T> class that contains IEnumerable<T> methods that .net developer finds it more powerful and has an accurate semantic meaning than those of js Array. It's provided as a proxy to the native js Array.