Why not exporting LeafletLayer class

[George-Madeley]

I want to create a plugin based on protomaps-leaflet which contains a class that inherits from the LeafletLayer class but you currently define the class in the function leafletLayer() which is used to return a new instance of the LeafletLayer class. I was wondering why you have defined the class in the function and not in the global scope of the script and exported? In addition, why have you set the return type of leafletLayer() to unknown and now LeafletLayer?