the way to require class in moonscript. http://www.luafaq.org/#T8.1.5

main.moon

test = require "test"

t = test.TestClass()
t\update()
t\print()

print t.val

test.moon

G = {}

class TestClass

	new: =>
		@aa = 0
		@val = 100
		 
	update: =>
		@aa += 1
		@aa

	print: =>
		print @aa

G.TestClass = TestClass

return G