Possibly unused function in template - authCallback()

[nstuyvesant]

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Item	Version
generator-angular-fullstack	5.0.0-rc.4
Node	10.14.2
npm	6.5.0
Operating System	OS X 10

Item	Answer
Transpiler	Babel
Markup	Pug
CSS	SCSS
Router	ngRoute
Client Tests	Mocha
DB	SQL
Auth	Y

The authCallback() function in
templates/app/server/api/user(auth)/user.controller.js doesn't appear to be hooked up to anything.

Is this still in use? Sorry if I missed how it's invoked.