I have it integrated as a build step for my iOS app like this:
if which iblinter >/dev/null; then
iblinter lint
else
echo "warning: IBLinter not installed, download from https://github.com/IBDecodable/IBLinter"
fi
And it automatically detects all .storyboards and fails with the following errors for the watch kit storyboard.
WatchKitApp/Base.lproj/Interface.storyboard:0:0: warning: Parse XML error XML Element Error: Incorrect key ["archive"]
WatchKitApp/Base.lproj/Interface.storyboard:0:0: warning: Parse XML error XML Element Error: Incorrect key ["archive"]
WatchKitApp/Base.lproj/Interface.storyboard:0:0: warning: Parse XML error XML Element Error: Incorrect key ["archive"]
WatchKitApp/Base.lproj/Interface.storyboard:0:0: warning: Parse XML error XML Element Error: Incorrect key ["archive"]
WatchKitApp/Base.lproj/Interface.storyboard:0:0: warning: Parse XML error XML Element Error: Incorrect key ["archive"]