Gulp-useref has been updated with a new API

[edwardwilson]

There as been an update to gulp-useref (v3) which changes the API breaking the gulp file in this project. The use of $.useref.assets({searchPath: './'}) is now incorrect; resulting in the error TypeError: $.useref.assets is not a function

[nfantone]

+1 to this. I've come across this issue today. My build broke due to an involuntary upgrade of gulp-usref.