graph: convert legend.js to typescript

public/app/plugins/panel/graph/legend.js → public/app/plugins/panel/graph/legend.ts

-define([
-  'angular',
-  'lodash',
-  'jquery',
-  'perfect-scrollbar'
-],
-function (angular, _, $, PerfectScrollbar) {
-  'use strict';
+import angular from 'angular';
+import _ from 'lodash';
+import $ from 'jquery';
+import PerfectScrollbar from 'perfect-scrollbar';
 
-  var module = angular.module('grafana.directives');
+var module = angular.module('grafana.directives');
 
-  module.directive('graphLegend', function(popoverSrv, $timeout) {
+module.directive('graphLegend', function(popoverSrv, $timeout) {
 
   return {
     link: function(scope, elem) {
@@ -152,7 +148,6 @@ function (angular, _, $, PerfectScrollbar) {
           }
         }
 
-          var seriesShown = 0;
         var seriesElements = [];
 
         for (i = 0; i < seriesList.length; i++) {
@@ -189,8 +184,6 @@ function (angular, _, $, PerfectScrollbar) {
 
           html += '</div>';
           seriesElements.push($(html));
-
-            seriesShown++;
         }
 
         if (panel.legend.alignAsTable) {
@@ -211,13 +204,11 @@ function (angular, _, $, PerfectScrollbar) {
           $container.css("max-height", maxLegendHeight - 6);
           $container.append(seriesElements);
           if (!legendScrollbar) {
-              legendScrollbar = new PerfectScrollbar.default($container[0]);
+            legendScrollbar = new PerfectScrollbar($container[0]);
           }
           legendScrollbar.update();
         }
       }
     }
   };
-  });
-
 });