scopeWatchMonkeyPatch.ts

// Hack for monkey patching $scope.$watch
this.$scope.$watch = ((originalWatchFn) => {
  const scope = this.$scope;
  // tslint:disable-next-line
  return function(watchExpression, listener, objectEquality) {
    // tslint:disable-next-line
    const wrappedCB = function () {
      console.log(watchExpression, arguments[0], arguments[1]);
      listener.apply(null, arguments);
    };
    return originalWatchFn.apply(scope, [watchExpression, wrappedCB, objectEquality]);
  };
})(this.$scope.$watch);