Why is the module not working correctly?

Question

JavaScript

I need help connecting modules in webpack, there is a "Game" class in which, I connect the "Team" class to implement the battle between the created teams, the "Game" module does not see the "Team" module, as a result I see such an error (photo 1) , I attach a photo of the original module (photo 2-3) a photo of the Team module (4-5 photos), a photo of the Game module (6 photos)
Here is my whole code
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Answer 1

They forgot in the battle
this function before the team.