$rootScope.$debugMode.js

app.config(function($provide) {
  $provide.decorator('$rootScope', function($delegate) {

    Object.defineProperty($delegate.constructor.prototype, '$debugMode', {
      value: true,
      writable: true,
      enumerable: false
    });

    Object.defineProperty($delegate.constructor.prototype, '$toggleDebug', {
      value: function(config) {
        var scope = this
        console.log('before: ', scope.$debugMode)
        scope.$debugMode = !scope.$debugMode;
        console.log('after: ', scope.$debugMode)
      },
      enumerable: false
    });

    return $delegate;
  }); // end decorator
}); // end config