Importing custom classes using typescript

So, say I have a player class and I want to use it in my NPM based project… What is the correct way to import that class, which is in a separate .ts/js file from the main babylon initialization / world building create scene functionality?

Do I need to make an entirely new npm module just for that player class and keep flipping back and forth to edit that class, or is there a better way of importing that separate “player class” js file into my main game initialization file so its compiled into the by default main.js at compile time.