--How would i return a finish value from module to localscript?

So im trying to make a animation list for my framework in a module script. It holds the animation from the gun, but my biggest problem is, i don't know how to make it return when the function is finished. So my question is, How would i go about doing so;

Localscript calls out module script's function,

----------------------This is the part i need: repeat wait() until ***Function Is Finished ***

I tryed adding a value within the module script, but it wont change.