Since we cannot inject $scope inside controllers in Angular 1.4+, how can we watch expressions the way we used to do with $scope.$watch?
An attempt to inject $scope can be seen here ("Could not instantiate controller" error), and tutorials tells us that:
Angular wont be able to instantiate the controller if we pass $scope in it. It defines its observable properties on this. (source)
I ran into this and needed an npm package; no good having everyone on the team build from source for the time being. We released an interim package on npm that fixes this issue: npm install loomio-angular-router@0.5.7
Note: you may need to rename ng-viewport to ng-outlet to get the interim package working.