Hello,
I have installed babylon through npm. How do I know what folder to look for a specific class that I want to be imported? Namely, I am looking for the Matrix class folder and I can’t find it anywhere. I don’t want to import * as BABYLON. (It would lead to a longer code as I understand it.)
This is only true with the @babylonjs/core package : ES6 - Babylon.js Documentation
About the file this is the main issue 
it basically follows the exact same hierarchy as the sources so the easiest is usually to locate them in the repo.
Matrix will be in @babylonjs/core/Maths/math.vector
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