Simple AngularJs directive that adds a positive and negative class to the element, using the built in currency filter

currency wrapper

angular.module('homeBanking.directives', [])
    .directive("hbCurrency", ($filter: ng.IFilterService) => {
        return {
            restrict: "EAC",
            require: "?$filter",
            link: function ($scope: ng.IScope, elm, attrs) {
                var currencyFilter = $filter('currency'),
                    rawAmount = $scope.$eval(attrs.hbCurrency),
                    className = rawAmount >= 0 ? "positive" : "negative";

                elm.text(currencyFilter(rawAmount)).addClass(className);
            }
        }
    });