Is there a clean / official way to extend the scope prototype to append 
some features (as we can do with jQuery...)

I'm near to use this but, my approach is like a rape... 


  .run(function ($rootScope) {

    $rootScope.constructor.prototype.$watchOnce = function (watchExpression, 
fn, objectEquality) {
      var unwatch = this.$watch(watchExpression, function (value) {
        if (value !== undefined) {
          fn.apply(this, arguments);
      }, objectEquality);
      return unwatch;


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