Client Script Not Being Added

I am attempting to add moment.js to my web app so I can use the functions in Visible When expressions.

I followed the Custom Input Elements instructions.

I made sure to refresh and generate the project. I inspected the source and there is no _System.js file included on the webpage. When my visible when expressions are triggered I thus get a javascript console error because the functions are not found.

What have I done incorrectly?
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