Overriding core user data files for Magepack

Question

We are working on getting Magepack installed on our dev environment. One of the shims we had to fix was in the "customer-data.js". It works when we edit the core file(vendor/magento/module-customer/view/frontend/web/js/customer-data.js), but when we try and put it into the "app/code" file, the override doesn't seem to work. This is what we are trying.
app/code/Magento/Customer/view/frontend/web/js/customer-data.js

We've deployed, clear cache, everything, but that file does not override for some reason