therefore, when the calling script calls this file.... it will run the loop?

Yep - as long as you import this file, all the code in it will run.

Programming is confusing lol 🙂

Programming is hard 🙂

well it's very confusing for me... :-$

There’s actually a small gotcha in TypeScript. When you import something like this:

import something from './something'

but don’t actually use any of the imported symbols in the file where you import it (i.e. in this case the symbol is

something

) or you’re only importing a type, but not a value, the generated runtime code will not load the module, even if you have specified the import. This is kind of an implicit dead code / unused import removal. If you want to import a file just for it’s side-effects, without using any of it’s exported symbols, you have to write simply:

import './something'

. This will always load the module. Here’s a bit more info on that behaviour: https://github.com/Microsoft/TypeScript/wiki/FAQ#why-are-imports-being-elided-in-my-emit