Here's the simplest possible code for creating a custom collection class in the Microsoft .NET Framework that includes support for For…Each loops, an indexer method and initializing collections with { ...

Whenever I create a class that uses the interface as the base class, compile it and register it, my new DLL doesn't have any interface. What am I missing here?<BR><BR>TIA for any guidance.

If you like the idea of creating a new class from whatever other classes you have lying around, you have two ways of doing in TypeScript ... and both are type safe (within limits).