Merge remote-tracking branch 'grafana/master'

* grafana/master:
  added rule prefer const to tslint (#13071)
  dep ensure (#13074)
  changed var to const 2 (#13068)
  changed var to const (#13061)
  update latest.json to latest stable version
  docs: corrected docs description for setting
  changelog: add notes about 4.6.4 and 5.2.3 releases

CHANGELOG.md

@@ -73,6 +73,12 @@ These are new features that's still being worked on and are in an experimental p
 
 * **Frontend**: Convert all Frontend Karma tests to Jest tests [#12224](https://github.com/grafana/grafana/issues/12224)
 
+# 5.2.3 (2018-08-29)
+
+### Important fix for LDAP & OAuth login vulnerability
+
+See [security announcement](https://community.grafana.com/t/grafana-5-2-3-and-4-6-4-security-update/10050) for details.
+
 # 5.2.2 (2018-07-25)
 
 ### Minor
@@ -441,6 +447,12 @@ The following properties have been deprecated and will be removed in a future re
   - `uri` property in `GET /api/search` -> Use new `url` or `uid` property instead
   - `meta.slug` property in `GET /api/dashboards/uid/:uid` and `GET /api/dashboards/db/:slug` -> Use new `meta.url` or `dashboard.uid` property instead
 
+# 4.6.4 (2018-08-29)
+
+### Important fix for LDAP & OAuth login vulnerability
+
+See [security announcement](https://community.grafana.com/t/grafana-5-2-3-and-4-6-4-security-update/10050) for details.
+
 # 4.6.3 (2017-12-14)
 
 ## Fixes

Gopkg.lock

@@ -427,12 +427,6 @@
   revision = "1744e2970ca51c86172c8190fadad617561ed6e7"
   version = "v1.0.0"
 
-[[projects]]
-  branch = "master"
-  name = "github.com/shurcooL/sanitized_anchor_name"
-  packages = ["."]
-  revision = "86672fcb3f950f35f2e675df2240550f2a50762f"
-
 [[projects]]
   name = "github.com/smartystreets/assertions"
   packages = [
@@ -679,6 +673,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "cb8e7fd81f23ec987fc4d5dd9d31ae0f1164bc2f30cbea2fe86e0d97dd945beb"
+  inputs-digest = "81a37e747b875cf870c1b9486fa3147e704dea7db8ba86f7cb942d3ddc01d3e3"
   solver-name = "gps-cdcl"
   solver-version = 1

docs/sources/installation/configuration.md

@@ -266,7 +266,8 @@ The number of days the keep me logged in / remember me cookie lasts.
 
 ### secret_key
 
-Used for signing keep me logged in / remember me cookies.
+Used for signing some datasource settings like secrets and passwords. Cannot be changed without requiring an update
+to datasource settings to re-encode them.
 
 ### disable_gravatar
 

latest.json

@@ -1,4 +1,4 @@
 {
-  "stable": "5.2.0",
-  "testing": "5.2.0"
+  "stable": "5.2.3",
+  "testing": "5.2.3"
 }

public/app/core/app_events.ts

@@ -1,4 +1,4 @@
 import { Emitter } from './utils/emitter';
 
-var appEvents = new Emitter();
+const appEvents = new Emitter();
 export default appEvents;

public/app/core/components/code_editor/code_editor.ts

@@ -99,9 +99,9 @@ function link(scope, elem, attrs) {
   if (scope.codeEditorFocus) {
     setTimeout(function() {
       textarea.focus();
-      var domEl = textarea[0];
+      const domEl = textarea[0];
       if (domEl.setSelectionRange) {
-        var pos = textarea.val().length * 2;
+        const pos = textarea.val().length * 2;
         domEl.setSelectionRange(pos, pos);
       }
     }, 100);

public/app/core/components/dashboard_selector.ts

@@ -1,6 +1,6 @@
 import coreModule from 'app/core/core_module';
 
-var template = `
+const template = `
 <select class="gf-form-input" ng-model="ctrl.model" ng-options="f.value as f.text for f in ctrl.options"></select>
 `;
 

public/app/core/components/grafana_app.ts

@@ -49,7 +49,7 @@ export class GrafanaCtrl {
     };
 
     $rootScope.onAppEvent = function(name, callback, localScope) {
-      var unbind = $rootScope.$on(name, callback);
+      const unbind = $rootScope.$on(name, callback);
       var callerScope = this;
       if (callerScope.$id === 1 && !localScope) {
         console.log('warning rootScope onAppEvent called without localscope');
@@ -76,7 +76,7 @@ export function grafanaAppDirective(playlistSrv, contextSrv, $timeout, $rootScop
     controller: GrafanaCtrl,
     link: (scope, elem) => {
       var sidemenuOpen;
-      var body = $('body');
+      const body = $('body');
 
       // see https://github.com/zenorocha/clipboard.js/issues/155
       $.fn.modal.Constructor.prototype.enforceFocus = function() {};
@@ -153,7 +153,7 @@ export function grafanaAppDirective(playlistSrv, contextSrv, $timeout, $rootScop
       // handle in active view state class
       var lastActivity = new Date().getTime();
       var activeUser = true;
-      var inActiveTimeLimit = 60 * 1000;
+      const inActiveTimeLimit = 60 * 1000;
       var sidemenuHidden = false;
 
       function checkForInActiveUser() {
@@ -215,16 +215,16 @@ export function grafanaAppDirective(playlistSrv, contextSrv, $timeout, $rootScop
 
       // handle document clicks that should hide things
       body.click(function(evt) {
-        var target = $(evt.target);
+        const target = $(evt.target);
         if (target.parents().length === 0) {
           return;
         }
 
         // for stuff that animates, slides out etc, clicking it needs to
         // hide it right away
-        var clickAutoHide = target.closest('[data-click-hide]');
+        const clickAutoHide = target.closest('[data-click-hide]');
         if (clickAutoHide.length) {
-          var clickAutoHideParent = clickAutoHide.parent();
+          const clickAutoHideParent = clickAutoHide.parent();
           clickAutoHide.detach();
           setTimeout(function() {
             clickAutoHideParent.append(clickAutoHide);
@@ -245,7 +245,7 @@ export function grafanaAppDirective(playlistSrv, contextSrv, $timeout, $rootScop
         }
 
         // hide popovers
-        var popover = elem.find('.popover');
+        const popover = elem.find('.popover');
         if (popover.length > 0 && target.parents('.graph-legend').length === 0) {
           popover.hide();
         }

public/app/core/components/json_explorer/helpers.ts

@@ -12,7 +12,7 @@ function escapeString(str: string): string {
  * Determines if a value is an object
 */
 export function isObject(value: any): boolean {
-  var type = typeof value;
+  const type = typeof value;
   return !!value && type === 'object';
 }
 
@@ -55,7 +55,7 @@ export function getType(object: Object): string {
  * Generates inline preview for a JavaScript object based on a value
 */
 export function getValuePreview(object: Object, value: string): string {
-  var type = getType(object);
+  const type = getType(object);
 
   if (type === 'null' || type === 'undefined') {
     return type;

public/app/core/components/json_explorer/json_explorer.ts

@@ -279,7 +279,7 @@ export class JsonExplorer {
       const objectWrapperSpan = createElement('span');
 
       // get constructor name and append it to wrapper span
-      var constructorName = createElement('span', 'constructor-name', this.constructorName);
+      const constructorName = createElement('span', 'constructor-name', this.constructorName);
       objectWrapperSpan.appendChild(constructorName);
 
       // if it's an array append the array specific elements like brackets and length

public/app/core/components/jsontree/jsontree.ts

@@ -11,7 +11,7 @@ coreModule.directive('jsonTree', [
         rootName: '@',
       },
       link: function(scope, elem) {
-        var jsonExp = new JsonExplorer(scope.object, 3, {
+        const jsonExp = new JsonExplorer(scope.object, 3, {
           animateOpen: true,
         });
 

public/app/core/components/layout_selector/layout_selector.ts

@@ -1,7 +1,7 @@
 import store from 'app/core/store';
 import coreModule from 'app/core/core_module';
 
-var template = `
+const template = `
 <div class="layout-selector">
   <button ng-click="ctrl.listView()" ng-class="{active: ctrl.mode === 'list'}">
     <i class="fa fa-list"></i>
@@ -51,7 +51,7 @@ export function layoutMode($rootScope) {
     restrict: 'A',
     scope: {},
     link: function(scope, elem) {
-      var layout = store.get('grafana.list.layout.mode') || 'grid';
+      const layout = store.get('grafana.list.layout.mode') || 'grid';
       var className = 'card-list-layout-' + layout;
       elem.addClass(className);
 

public/app/core/components/query_part/query_part.ts

@@ -82,9 +82,9 @@ export class QueryPart {
 }
 
 export function functionRenderer(part, innerExpr) {
-  var str = part.def.type + '(';
-  var parameters = _.map(part.params, (value, index) => {
-    var paramType = part.def.params[index];
+  const str = part.def.type + '(';
+  const parameters = _.map(part.params, (value, index) => {
+    const paramType = part.def.params[index];
     if (paramType.type === 'time') {
       if (value === 'auto') {
         value = '$__interval';

public/app/core/components/query_part/query_part_editor.ts

@@ -2,7 +2,7 @@ import _ from 'lodash';
 import $ from 'jquery';
 import coreModule from 'app/core/core_module';
 
-var template = `
+const template = `
 <div class="dropdown cascade-open">
 <a ng-click="showActionsMenu()" class="query-part-name pointer dropdown-toggle" data-toggle="dropdown">{{part.def.type}}</a>
 <span>(</span><span class="query-part-parameters"></span><span>)</span>
@@ -15,7 +15,7 @@ var template = `
 
 /** @ngInject */
 export function queryPartEditorDirective($compile, templateSrv) {
-  var paramTemplate = '<input type="text" class="hide input-mini tight-form-func-param"></input>';
+  const paramTemplate = '<input type="text" class="hide input-mini tight-form-func-param"></input>';
 
   return {
     restrict: 'E',
@@ -26,17 +26,17 @@ export function queryPartEditorDirective($compile, templateSrv) {
       debounce: '@',
     },
     link: function postLink($scope, elem) {
-      var part = $scope.part;
-      var partDef = part.def;
-      var $paramsContainer = elem.find('.query-part-parameters');
-      var debounceLookup = $scope.debounce;
+      const part = $scope.part;
+      const partDef = part.def;
+      const $paramsContainer = elem.find('.query-part-parameters');
+      const debounceLookup = $scope.debounce;
 
       $scope.partActions = [];
 
       function clickFuncParam(paramIndex) {
         /*jshint validthis:true */
-        var $link = $(this);
-        var $input = $link.next();
+        const $link = $(this);
+        const $input = $link.next();
 
         $input.val(part.params[paramIndex]);
         $input.css('width', $link.width() + 16 + 'px');
@@ -46,7 +46,7 @@ export function queryPartEditorDirective($compile, templateSrv) {
         $input.focus();
         $input.select();
 
-        var typeahead = $input.data('typeahead');
+        const typeahead = $input.data('typeahead');
         if (typeahead) {
           $input.val('');
           typeahead.lookup();
@@ -55,9 +55,9 @@ export function queryPartEditorDirective($compile, templateSrv) {
 
       function inputBlur(paramIndex) {
         /*jshint validthis:true */
-        var $input = $(this);
-        var $link = $input.prev();
-        var newValue = $input.val();
+        const $input = $(this);
+        const $link = $input.prev();
+        const newValue = $input.val();
 
         if (newValue !== '' || part.def.params[paramIndex].optional) {
           $link.html(templateSrv.highlightVariablesAsHtml(newValue));
@@ -89,7 +89,7 @@ export function queryPartEditorDirective($compile, templateSrv) {
           return;
         }
 
-        var typeaheadSource = function(query, callback) {
+        const typeaheadSource = function(query, callback) {
           if (param.options) {
             var options = param.options;
             if (param.type === 'int') {
@@ -102,7 +102,7 @@ export function queryPartEditorDirective($compile, templateSrv) {
 
           $scope.$apply(function() {
             $scope.handleEvent({ $event: { name: 'get-param-options' } }).then(function(result) {
-              var dynamicOptions = _.map(result, function(op) {
+              const dynamicOptions = _.map(result, function(op) {
                 return op.value;
               });
               callback(dynamicOptions);
@@ -124,10 +124,10 @@ export function queryPartEditorDirective($compile, templateSrv) {
           },
         });
 
-        var typeahead = $input.data('typeahead');
+        const typeahead = $input.data('typeahead');
         typeahead.lookup = function() {
           this.query = this.$element.val() || '';
-          var items = this.source(this.query, $.proxy(this.process, this));
+          const items = this.source(this.query, $.proxy(this.process, this));
           return items ? this.process(items) : items;
         };
 
@@ -156,9 +156,9 @@ export function queryPartEditorDirective($compile, templateSrv) {
             $('<span>, </span>').appendTo($paramsContainer);
           }
 
-          var paramValue = templateSrv.highlightVariablesAsHtml(part.params[index]);
-          var $paramLink = $('<a class="graphite-func-param-link pointer">' + paramValue + '</a>');
-          var $input = $(paramTemplate);
+          const paramValue = templateSrv.highlightVariablesAsHtml(part.params[index]);
+          const $paramLink = $('<a class="graphite-func-param-link pointer">' + paramValue + '</a>');
+          const $input = $(paramTemplate);
 
           $paramLink.appendTo($paramsContainer);
           $input.appendTo($paramsContainer);

public/app/core/components/search/search.ts

@@ -159,7 +159,7 @@ export class SearchCtrl {
 
   searchDashboards() {
     this.currentSearchId = this.currentSearchId + 1;
-    var localSearchId = this.currentSearchId;
+    const localSearchId = this.currentSearchId;
 
     return this.searchSrv.search(this.query).then(results => {
       if (localSearchId < this.currentSearchId) {
@@ -172,7 +172,7 @@ export class SearchCtrl {
   }
 
   queryHasNoFilters() {
-    var query = this.query;
+    const query = this.query;
     return query.query === '' && query.starred === false && query.tag.length === 0;
   }
 

public/app/core/components/sidemenu/sidemenu.ts

@@ -74,8 +74,8 @@ export function sideMenuDirective() {
     link: function(scope, elem) {
       // hack to hide dropdown menu
       elem.on('click.dropdown', '.dropdown-menu a', function(evt) {
-        var menu = $(evt.target).parents('.dropdown-menu');
-        var parent = menu.parent();
+        const menu = $(evt.target).parents('.dropdown-menu');
+        const parent = menu.parent();
         menu.detach();
 
         setTimeout(function() {

public/app/core/components/switch.ts

@@ -1,6 +1,6 @@
 import coreModule from 'app/core/core_module';
 
-var template = `
+const template = `
 <label for="check-{{ctrl.id}}" class="gf-form-label {{ctrl.labelClass}} pointer" ng-show="ctrl.label">
   {{ctrl.label}}
   <info-popover mode="right-normal" ng-if="ctrl.tooltip" position="top center">

public/app/core/directives/give_focus.ts

@@ -14,9 +14,9 @@ coreModule.directive('giveFocus', function() {
         }
         setTimeout(function() {
           element.focus();
-          var domEl = element[0];
+          const domEl = element[0];
           if (domEl.setSelectionRange) {
-            var pos = element.val().length * 2;
+            const pos = element.val().length * 2;
             domEl.setSelectionRange(pos, pos);
           }
         }, 200);

public/app/core/directives/misc.ts

@@ -82,11 +82,11 @@ function editorOptBool($compile) {
   return {
     restrict: 'E',
     link: function(scope, elem, attrs) {
-      var ngchange = attrs.change ? ' ng-change="' + attrs.change + '"' : '';
-      var tip = attrs.tip ? ' <tip>' + attrs.tip + '</tip>' : '';
-      var showIf = attrs.showIf ? ' ng-show="' + attrs.showIf + '" ' : '';
+      const ngchange = attrs.change ? ' ng-change="' + attrs.change + '"' : '';
+      const tip = attrs.tip ? ' <tip>' + attrs.tip + '</tip>' : '';
+      const showIf = attrs.showIf ? ' ng-show="' + attrs.showIf + '" ' : '';
 
-      var template =
+      const template =
         '<div class="editor-option gf-form-checkbox text-center"' +
         showIf +
         '>' +
@@ -119,11 +119,11 @@ function editorCheckbox($compile, $interpolate) {
   return {
     restrict: 'E',
     link: function(scope, elem, attrs) {
-      var text = $interpolate(attrs.text)(scope);
-      var model = $interpolate(attrs.model)(scope);
-      var ngchange = attrs.change ? ' ng-change="' + attrs.change + '"' : '';
-      var tip = attrs.tip ? ' <tip>' + attrs.tip + '</tip>' : '';
-      var label = '<label for="' + scope.$id + model + '" class="checkbox-label">' + text + tip + '</label>';
+      const text = $interpolate(attrs.text)(scope);
+      const model = $interpolate(attrs.model)(scope);
+      const ngchange = attrs.change ? ' ng-change="' + attrs.change + '"' : '';
+      const tip = attrs.tip ? ' <tip>' + attrs.tip + '</tip>' : '';
+      const label = '<label for="' + scope.$id + model + '" class="checkbox-label">' + text + tip + '</label>';
 
       var template =
         '<input class="cr1" id="' +
@@ -152,8 +152,8 @@ function editorCheckbox($compile, $interpolate) {
 /** @ngInject */
 function gfDropdown($parse, $compile, $timeout) {
   function buildTemplate(items, placement?) {
-    var upclass = placement === 'top' ? 'dropup' : '';
-    var ul = ['<ul class="dropdown-menu ' + upclass + '" role="menu" aria-labelledby="drop1">', '</ul>'];
+    const upclass = placement === 'top' ? 'dropup' : '';
+    const ul = ['<ul class="dropdown-menu ' + upclass + '" role="menu" aria-labelledby="drop1">', '</ul>'];
 
     for (let index = 0; index < items.length; index++) {
       const item = items[index];
@@ -192,11 +192,11 @@ function gfDropdown($parse, $compile, $timeout) {
     restrict: 'EA',
     scope: true,
     link: function postLink(scope, iElement, iAttrs) {
-      var getter = $parse(iAttrs.gfDropdown),
+      const getter = $parse(iAttrs.gfDropdown),
         items = getter(scope);
       $timeout(function() {
-        var placement = iElement.data('placement');
-        var dropdown = angular.element(buildTemplate(items, placement).join(''));
+        const placement = iElement.data('placement');
+        const dropdown = angular.element(buildTemplate(items, placement).join(''));
         dropdown.insertAfter(iElement);
         $compile(iElement.next('ul.dropdown-menu'))(scope);
       });

public/app/core/directives/ng_model_on_blur.ts

@@ -47,7 +47,7 @@ function validTimeSpan() {
         if (viewValue.indexOf('$') === 0 || viewValue.indexOf('+$') === 0) {
           return true; // allow template variable
         }
-        var info = rangeUtil.describeTextRange(viewValue);
+        const info = rangeUtil.describeTextRange(viewValue);
         return info.invalid !== true;
       };
     },

public/app/core/directives/rebuild_on_change.ts

@@ -3,7 +3,7 @@ import coreModule from '../core_module';
 
 function getBlockNodes(nodes) {
   var node = nodes[0];
-  var endNode = nodes[nodes.length - 1];
+  const endNode = nodes[nodes.length - 1];
   var blockNodes;
 
   for (var i = 1; node !== endNode && (node = node.nextSibling); i++) {

public/app/core/directives/tags.ts

@@ -47,7 +47,7 @@ function bootstrapTagsinput() {
         scope.model = [];
       }
 
-      var select = $('select', element);
+      const select = $('select', element);
 
       if (attrs.placeholder) {
         select.attr('placeholder', attrs.placeholder);
@@ -76,7 +76,7 @@ function bootstrapTagsinput() {
             scope.onTagsUpdated();
           }
         }
-        var tagElement = select
+        const tagElement = select
           .next()
           .children('span')
           .filter(function() {
@@ -86,7 +86,7 @@ function bootstrapTagsinput() {
       });
 
       select.on('itemRemoved', function(event) {
-        var idx = scope.model.indexOf(event.item);
+        const idx = scope.model.indexOf(event.item);
         if (idx !== -1) {
           scope.model.splice(idx, 1);
           if (scope.onTagsUpdated) {

public/app/core/jquery_extended.ts

@@ -2,10 +2,10 @@ import $ from 'jquery';
 import angular from 'angular';
 import _ from 'lodash';
 
-var $win = $(window);
+const $win = $(window);
 
 $.fn.place_tt = (function() {
-  var defaults = {
+  const defaults = {
     offset: 5,
   };
 
@@ -13,9 +13,8 @@ $.fn.place_tt = (function() {
     opts = $.extend(true, {}, defaults, opts);
 
     return this.each(function() {
-      var $tooltip = $(this),
-        width,
-        height;
+      const $tooltip = $(this);
+      let width, height;
 
       $tooltip.addClass('grafana-tooltip');
 
@@ -30,7 +29,7 @@ $.fn.place_tt = (function() {
             '$compile',
             '$rootScope',
             function($compile, $rootScope) {
-              var tmpScope = $rootScope.$new(true);
+              const tmpScope = $rootScope.$new(true);
               _.extend(tmpScope, opts.scopeData);
 
               $compile($tooltip)(tmpScope);

public/app/core/live/live_srv.ts

@@ -13,7 +13,7 @@ export class LiveSrv {
   }
 
   getWebSocketUrl() {
-    var l = window.location;
+    const l = window.location;
     return (l.protocol === 'https:' ? 'wss://' : 'ws://') + l.host + config.appSubUrl + '/ws';
   }
 
@@ -66,7 +66,7 @@ export class LiveSrv {
       return;
     }
 
-    var observer = this.observers[message.stream];
+    const observer = this.observers[message.stream];
     if (!observer) {
       this.removeObserver(message.stream, null);
       return;
@@ -128,5 +128,5 @@ export class LiveSrv {
   }
 }
 
-var instance = new LiveSrv();
+const instance = new LiveSrv();
 export { instance as liveSrv };

public/app/core/nav_model_srv.ts

@@ -39,7 +39,7 @@ export class NavModelSrv {
 
   getNav(...args) {
     var children = this.navItems;
-    var nav = new NavModel();
+    const nav = new NavModel();
 
     for (const id of args) {
       // if its a number then it's the index to use for main
@@ -69,7 +69,7 @@ export class NavModelSrv {
   }
 
   getNotFoundNav() {
-    var node = {
+    const node = {
       text: 'Page not found',
       icon: 'fa fa-fw fa-warning',
       subTitle: '404 Error',

public/app/core/profiler.ts

@@ -64,11 +64,11 @@ export class Profiler {
       console.log('Dashboard::Performance Total Watchers: ' + this.getTotalWatcherCount());
       console.log('Dashboard::Performance Total ScopeCount: ' + this.scopeCount);
 
-      var timeTaken = this.timings.lastPanelInitializedAt - this.timings.dashboardLoadStart;
+      const timeTaken = this.timings.lastPanelInitializedAt - this.timings.dashboardLoadStart;
       console.log('Dashboard::Performance All panels initialized in ' + timeTaken + ' ms');
 
       // measure digest performance
-      var rootDigestStart = window.performance.now();
+      const rootDigestStart = window.performance.now();
       for (var i = 0; i < 30; i++) {
         this.$rootScope.$apply();
       }
@@ -80,9 +80,9 @@ export class Profiler {
   getTotalWatcherCount() {
     var count = 0;
     var scopes = 0;
-    var root = $(document.getElementsByTagName('body'));
+    const root = $(document.getElementsByTagName('body'));
 
-    var f = function(element) {
+    const f = function(element) {
       if (element.data().hasOwnProperty('$scope')) {
         scopes++;
         angular.forEach(element.data().$scope.$$watchers, function() {
@@ -126,5 +126,5 @@ export class Profiler {
   }
 }
 
-var profiler = new Profiler();
+const profiler = new Profiler();
 export { profiler };

public/app/core/services/backend_srv.ts

@@ -74,8 +74,8 @@ export class BackendSrv {
 
   request(options) {
     options.retry = options.retry || 0;
-    var requestIsLocal = !options.url.match(/^http/);
-    var firstAttempt = options.retry === 0;
+    const requestIsLocal = !options.url.match(/^http/);
+    const firstAttempt = options.retry === 0;
 
     if (requestIsLocal) {
       if (this.contextSrv.user && this.contextSrv.user.orgId) {
@@ -123,30 +123,31 @@ export class BackendSrv {
   }
 
   resolveCancelerIfExists(requestId) {
-    var cancelers = this.inFlightRequests[requestId];
+    const cancelers = this.inFlightRequests[requestId];
     if (!_.isUndefined(cancelers) && cancelers.length) {
       cancelers[0].resolve();
     }
   }
 
   datasourceRequest(options) {
+    let canceler = null;
     options.retry = options.retry || 0;
 
     // A requestID is provided by the datasource as a unique identifier for a
     // particular query. If the requestID exists, the promise it is keyed to
     // is canceled, canceling the previous datasource request if it is still
     // in-flight.
-    var requestId = options.requestId;
+    const requestId = options.requestId;
     if (requestId) {
       this.resolveCancelerIfExists(requestId);
       // create new canceler
-      var canceler = this.$q.defer();
+      canceler = this.$q.defer();
       options.timeout = canceler.promise;
       this.addCanceler(requestId, canceler);
     }
 
-    var requestIsLocal = !options.url.match(/^http/);
-    var firstAttempt = options.retry === 0;
+    const requestIsLocal = !options.url.match(/^http/);
+    const firstAttempt = options.retry === 0;
 
     if (requestIsLocal) {
       if (this.contextSrv.user && this.contextSrv.user.orgId) {

public/app/core/services/context_srv.ts

@@ -59,7 +59,7 @@ export class ContextSrv {
   }
 }
 
-var contextSrv = new ContextSrv();
+const contextSrv = new ContextSrv();
 export { contextSrv };
 
 coreModule.factory('contextSrv', function() {

public/app/core/services/impression_srv.ts

@@ -6,7 +6,7 @@ export class ImpressionSrv {
   constructor() {}
 
   addDashboardImpression(dashboardId) {
-    var impressionsKey = this.impressionKey(config);
+    const impressionsKey = this.impressionKey(config);
     var impressions = [];
     if (store.exists(impressionsKey)) {
       impressions = JSON.parse(store.get(impressionsKey));

public/app/core/services/ng_react.ts

@@ -52,9 +52,9 @@ function applied(fn, scope) {
   if (fn.wrappedInApply) {
     return fn;
   }
-  var wrapped: any = function() {
-    var args = arguments;
-    var phase = scope.$root.$$phase;
+  const wrapped: any = function() {
+    const args = arguments;
+    const phase = scope.$root.$$phase;
     if (phase === '$apply' || phase === '$digest') {
       return fn.apply(null, args);
     } else {
@@ -81,8 +81,8 @@ function applied(fn, scope) {
  */
 function applyFunctions(obj, scope, propsConfig?) {
   return Object.keys(obj || {}).reduce(function(prev, key) {
-    var value = obj[key];
-    var config = (propsConfig || {})[key] || {};
+    const value = obj[key];
+    const config = (propsConfig || {})[key] || {};
     /**
      * wrap functions in a function that ensures they are scope.$applied
      * ensures that when function is called from a React component
@@ -103,14 +103,14 @@ function applyFunctions(obj, scope, propsConfig?) {
  * If watchDepth attribute is NOT reference or collection, watchDepth defaults to deep watching by value
  */
 function watchProps(watchDepth, scope, watchExpressions, listener) {
-  var supportsWatchCollection = angular.isFunction(scope.$watchCollection);
-  var supportsWatchGroup = angular.isFunction(scope.$watchGroup);
+  const supportsWatchCollection = angular.isFunction(scope.$watchCollection);
+  const supportsWatchGroup = angular.isFunction(scope.$watchGroup);
 
-  var watchGroupExpressions = [];
+  const watchGroupExpressions = [];
 
   watchExpressions.forEach(function(expr) {
-    var actualExpr = getPropExpression(expr);
-    var exprWatchDepth = getPropWatchDepth(watchDepth, expr);
+    const actualExpr = getPropExpression(expr);
+    const exprWatchDepth = getPropWatchDepth(watchDepth, expr);
 
     if (exprWatchDepth === 'collection' && supportsWatchCollection) {
       scope.$watchCollection(actualExpr, listener);
@@ -156,7 +156,7 @@ function getPropExpression(prop) {
 
 // find the normalized attribute knowing that React props accept any type of capitalization
 function findAttribute(attrs, propName) {
-  var index = Object.keys(attrs).filter(function(attr) {
+  const index = Object.keys(attrs).filter(function(attr) {
     return attr.toLowerCase() === propName.toLowerCase();
   })[0];
   return attrs[index];
@@ -164,7 +164,7 @@ function findAttribute(attrs, propName) {
 
 // get watch depth of prop (string or array)
 function getPropWatchDepth(defaultWatch, prop) {
-  var customWatchDepth = Array.isArray(prop) && angular.isObject(prop[1]) && prop[1].watchDepth;
+  const customWatchDepth = Array.isArray(prop) && angular.isObject(prop[1]) && prop[1].watchDepth;
   return customWatchDepth || defaultWatch;
 }
 
@@ -186,16 +186,16 @@ function getPropWatchDepth(defaultWatch, prop) {
 //         }
 //     }));
 //
-var reactComponent = function($injector) {
+const reactComponent = function($injector) {
   return {
     restrict: 'E',
     replace: true,
     link: function(scope, elem, attrs) {
-      var reactComponent = getReactComponent(attrs.name, $injector);
+      const reactComponent = getReactComponent(attrs.name, $injector);
 
-      var renderMyComponent = function() {
-        var scopeProps = scope.$eval(attrs.props);
-        var props = applyFunctions(scopeProps, scope);
+      const renderMyComponent = function() {
+        const scopeProps = scope.$eval(attrs.props);
+        const props = applyFunctions(scopeProps, scope);
 
         renderComponent(reactComponent, props, scope, elem);
       };
@@ -243,24 +243,24 @@ var reactComponent = function($injector) {
 //
 //     <hello name="name"/>
 //
-var reactDirective = function($injector) {
+const reactDirective = function($injector) {
   return function(reactComponentName, props, conf, injectableProps) {
-    var directive = {
+    const directive = {
       restrict: 'E',
       replace: true,
       link: function(scope, elem, attrs) {
-        var reactComponent = getReactComponent(reactComponentName, $injector);
+        const reactComponent = getReactComponent(reactComponentName, $injector);
 
         // if props is not defined, fall back to use the React component's propTypes if present
         props = props || Object.keys(reactComponent.propTypes || {});
 
         // for each of the properties, get their scope value and set it to scope.props
-        var renderMyComponent = function() {
-          var scopeProps = {},
-            config = {};
+        const renderMyComponent = function() {
+          var scopeProps = {};
+          const config = {};
 
           props.forEach(function(prop) {
-            var propName = getPropName(prop);
+            const propName = getPropName(prop);
             scopeProps[propName] = scope.$eval(findAttribute(attrs, propName));
             config[propName] = getPropConfig(prop);
           });
@@ -272,7 +272,7 @@ var reactDirective = function($injector) {
 
         // watch each property name and trigger an update whenever something changes,
         // to update scope.props with new values
-        var propExpressions = props.map(function(prop) {
+        const propExpressions = props.map(function(prop) {
           return Array.isArray(prop) ? [attrs[getPropName(prop)], getPropConfig(prop)] : attrs[prop];
         });
 

public/app/core/services/search_srv.ts

@@ -31,7 +31,7 @@ export class SearchSrv {
   }
 
   private queryForRecentDashboards() {
-    var dashIds = _.take(impressionSrv.getDashboardOpened(), 5);
+    const dashIds = _.take(impressionSrv.getDashboardOpened(), 5);
     if (dashIds.length === 0) {
       return Promise.resolve([]);
     }

public/app/core/time_series2.ts

@@ -8,7 +8,7 @@ function matchSeriesOverride(aliasOrRegex, seriesAlias) {
   }
 
   if (aliasOrRegex[0] === '/') {
-    var regex = kbn.stringToJsRegex(aliasOrRegex);
+    const regex = kbn.stringToJsRegex(aliasOrRegex);
     return seriesAlias.match(regex) != null;
   }
 
@@ -43,9 +43,9 @@ export function updateLegendValues(data: TimeSeries[], panel, height) {
       // legend and tooltip gets one more decimal precision
       // than graph legend ticks
       const { datamin, datamax } = getDataMinMax(data);
-      let { tickDecimals, scaledDecimals } = getFlotTickDecimals(datamin, datamax, axis, height);
-      tickDecimals = (tickDecimals || -1) + 1;
-      series.updateLegendValues(formater, tickDecimals, scaledDecimals + 2);
+      const { tickDecimals, scaledDecimals } = getFlotTickDecimals(datamin, datamax, axis, height);
+      const tickDecimalsPlusOne = (tickDecimals || -1) + 1;
+      series.updateLegendValues(formater, tickDecimalsPlusOne, scaledDecimals + 2);
     }
   }
 }
@@ -125,7 +125,7 @@ export default class TimeSeries {
     delete this.bars.show;
 
     for (var i = 0; i < overrides.length; i++) {
-      var override = overrides[i];
+      const override = overrides[i];
       if (!matchSeriesOverride(override.alias, this.alias)) {
         continue;
       }
@@ -193,7 +193,7 @@ export default class TimeSeries {
   }
 
   getFlotPairs(fillStyle) {
-    var result = [];
+    const result = [];
 
     this.stats.total = 0;
     this.stats.max = -Number.MAX_VALUE;
@@ -209,8 +209,8 @@ export default class TimeSeries {
     this.allIsNull = true;
     this.allIsZero = true;
 
-    var ignoreNulls = fillStyle === 'connected';
-    var nullAsZero = fillStyle === 'null as zero';
+    const ignoreNulls = fillStyle === 'connected';
+    const nullAsZero = fillStyle === 'null as zero';
     var currentTime;
     var currentValue;
     var nonNulls = 0;
@@ -330,7 +330,7 @@ export default class TimeSeries {
   isMsResolutionNeeded() {
     for (var i = 0; i < this.datapoints.length; i++) {
       if (this.datapoints[i][1] !== null) {
-        var timestamp = this.datapoints[i][1].toString();
+        const timestamp = this.datapoints[i][1].toString();
         if (timestamp.length === 13 && timestamp % 1000 !== 0) {
           return true;
         }

public/app/core/utils/datemath.ts

@@ -1,7 +1,7 @@
 import _ from 'lodash';
 import moment from 'moment';
 
-var units = ['y', 'M', 'w', 'd', 'h', 'm', 's'];
+const units = ['y', 'M', 'w', 'd', 'h', 'm', 's'];
 
 export function parse(text, roundUp?, timezone?) {
   if (!text) {
@@ -47,7 +47,7 @@ export function parse(text, roundUp?, timezone?) {
 }
 
 export function isValid(text) {
-  var date = parse(text);
+  const date = parse(text);
   if (!date) {
     return false;
   }
@@ -60,12 +60,12 @@ export function isValid(text) {
 }
 
 export function parseDateMath(mathString, time, roundUp?) {
-  var dateTime = time;
+  const dateTime = time;
   var i = 0;
-  var len = mathString.length;
+  const len = mathString.length;
 
   while (i < len) {
-    var c = mathString.charAt(i++);
+    const c = mathString.charAt(i++);
     var type;
     var num;
     var unit;
@@ -85,7 +85,7 @@ export function parseDateMath(mathString, time, roundUp?) {
     } else if (mathString.length === 2) {
       num = mathString.charAt(i);
     } else {
-      var numFrom = i;
+      const numFrom = i;
       while (!isNaN(mathString.charAt(i))) {
         i++;
         if (i > 10) {

public/app/core/utils/emitter.ts

@@ -15,7 +15,7 @@ export class Emitter {
     this.emitter.on(name, handler);
 
     if (scope) {
-      var unbind = scope.$on('$destroy', () => {
+      const unbind = scope.$on('$destroy', () => {
         this.emitter.off(name, handler);
         unbind();
       });

public/app/core/utils/model_utils.ts

@@ -1,5 +1,5 @@
 export function assignModelProperties(target, source, defaults, removeDefaults?) {
-  for (var key in defaults) {
+  for (const key in defaults) {
     if (!defaults.hasOwnProperty(key)) {
       continue;
     }

public/app/core/utils/outline.ts

@@ -2,10 +2,10 @@
 function outlineFixer() {
   const d: any = document;
 
-  var style_element = d.createElement('STYLE');
-  var dom_events = 'addEventListener' in d;
+  const style_element = d.createElement('STYLE');
+  const dom_events = 'addEventListener' in d;
 
-  var add_event_listener = function(type, callback) {
+  const add_event_listener = function(type, callback) {
     // Basic cross-browser event handling
     if (dom_events) {
       d.addEventListener(type, callback);
@@ -14,7 +14,7 @@ function outlineFixer() {
     }
   };
 
-  var set_css = function(css_text) {
+  const set_css = function(css_text) {
     // Handle setting of <style> element contents in IE8
     !!style_element.styleSheet ? (style_element.styleSheet.cssText = css_text) : (style_element.innerHTML = css_text);
   };

public/app/core/utils/sort_by_keys.ts

@@ -6,7 +6,7 @@ export default function sortByKeys(input) {
   }
 
   if (_.isPlainObject(input)) {
-    var sortedObject = {};
+    const sortedObject = {};
     for (const key of _.keys(input).sort()) {
       sortedObject[key] = sortByKeys(input[key]);
     }

public/app/core/utils/ticks.ts

@@ -11,9 +11,9 @@ export function tickStep(start: number, stop: number, count: number): number {
     e5 = Math.sqrt(10),
     e2 = Math.sqrt(2);
 
-  let step0 = Math.abs(stop - start) / Math.max(0, count),
-    step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
-    error = step0 / step1;
+  const step0 = Math.abs(stop - start) / Math.max(0, count);
+  let step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10));
+  const error = step0 / step1;
 
   if (error >= e10) {
     step1 *= 10;
@@ -39,13 +39,13 @@ export function getScaledDecimals(decimals, tick_size) {
  * @param tickDecimals  Tick decimal precision
  */
 export function getFlotTickSize(min: number, max: number, noTicks: number, tickDecimals: number) {
-  var delta = (max - min) / noTicks,
-    dec = -Math.floor(Math.log(delta) / Math.LN10),
-    maxDec = tickDecimals;
+  const delta = (max - min) / noTicks;
+  let dec = -Math.floor(Math.log(delta) / Math.LN10);
+  const maxDec = tickDecimals;
 
-  var magn = Math.pow(10, -dec),
-    norm = delta / magn, // norm is between 1.0 and 10.0
-    size;
+  const magn = Math.pow(10, -dec);
+  const norm = delta / magn; // norm is between 1.0 and 10.0
+  let size;
 
   if (norm < 1.5) {
     size = 1;
@@ -81,8 +81,8 @@ export function getFlotRange(panelMin, panelMax, datamin, datamax) {
   if (delta === 0.0) {
     // Grafana fix: wide Y min and max using increased wideFactor
     // when all series values are the same
-    var wideFactor = 0.25;
-    var widen = Math.abs(max === 0 ? 1 : max * wideFactor);
+    const wideFactor = 0.25;
+    const widen = Math.abs(max === 0 ? 1 : max * wideFactor);
 
     if (panelMin === null) {
       min -= widen;
@@ -94,7 +94,7 @@ export function getFlotRange(panelMin, panelMax, datamin, datamax) {
     }
   } else {
     // consider autoscaling
-    var margin = autoscaleMargin;
+    const margin = autoscaleMargin;
     if (margin != null) {
       if (panelMin == null) {
         min -= delta * margin;

public/app/features/alerting/alert_def.ts

@@ -1,7 +1,7 @@
 import _ from 'lodash';
 import { QueryPartDef, QueryPart } from 'app/core/components/query_part/query_part';
 
-var alertQueryDef = new QueryPartDef({
+const alertQueryDef = new QueryPartDef({
   type: 'query',
   params: [
     { name: 'queryRefId', type: 'string', dynamicLookup: true },
@@ -15,9 +15,9 @@ var alertQueryDef = new QueryPartDef({
   defaultParams: ['#A', '15m', 'now', 'avg'],
 });
 
-var conditionTypes = [{ text: 'Query', value: 'query' }];
+const conditionTypes = [{ text: 'Query', value: 'query' }];
 
-var alertStateSortScore = {
+const alertStateSortScore = {
   alerting: 1,
   no_data: 2,
   pending: 3,
@@ -25,7 +25,7 @@ var alertStateSortScore = {
   paused: 5,
 };
 
-var evalFunctions = [
+const evalFunctions = [
   { text: 'IS ABOVE', value: 'gt' },
   { text: 'IS BELOW', value: 'lt' },
   { text: 'IS OUTSIDE RANGE', value: 'outside_range' },
@@ -33,9 +33,9 @@ var evalFunctions = [
   { text: 'HAS NO VALUE', value: 'no_value' },
 ];
 
-var evalOperators = [{ text: 'OR', value: 'or' }, { text: 'AND', value: 'and' }];
+const evalOperators = [{ text: 'OR', value: 'or' }, { text: 'AND', value: 'and' }];
 
-var reducerTypes = [
+const reducerTypes = [
   { text: 'avg()', value: 'avg' },
   { text: 'min()', value: 'min' },
   { text: 'max()', value: 'max' },
@@ -48,17 +48,17 @@ var reducerTypes = [
   { text: 'count_non_null()', value: 'count_non_null' },
 ];
 
-var noDataModes = [
+const noDataModes = [
   { text: 'Alerting', value: 'alerting' },
   { text: 'No Data', value: 'no_data' },
   { text: 'Keep Last State', value: 'keep_state' },
   { text: 'Ok', value: 'ok' },
 ];
 
-var executionErrorModes = [{ text: 'Alerting', value: 'alerting' }, { text: 'Keep Last State', value: 'keep_state' }];
+const executionErrorModes = [{ text: 'Alerting', value: 'alerting' }, { text: 'Keep Last State', value: 'keep_state' }];
 
 function createReducerPart(model) {
-  var def = new QueryPartDef({ type: model.type, defaultParams: [] });
+  const def = new QueryPartDef({ type: model.type, defaultParams: [] });
   return new QueryPart(model, def);
 }
 

public/app/features/alerting/alert_tab_ctrl.ts

@@ -50,7 +50,7 @@ export class AlertTabCtrl {
     this.addNotificationSegment = this.uiSegmentSrv.newPlusButton();
 
     // subscribe to graph threshold handle changes
-    var thresholdChangedEventHandler = this.graphThresholdChanged.bind(this);
+    const thresholdChangedEventHandler = this.graphThresholdChanged.bind(this);
     this.panelCtrl.events.on('threshold-changed', thresholdChangedEventHandler);
 
     // set panel alert edit mode
@@ -129,7 +129,7 @@ export class AlertTabCtrl {
   }
 
   notificationAdded() {
-    var model = _.find(this.notifications, {
+    const model = _.find(this.notifications, {
       name: this.addNotificationSegment.value,
     });
     if (!model) {
@@ -154,7 +154,7 @@ export class AlertTabCtrl {
   }
 
   initModel() {
-    var alert = (this.alert = this.panel.alert);
+    const alert = (this.alert = this.panel.alert);
     if (!alert) {
       return;
     }
@@ -170,7 +170,7 @@ export class AlertTabCtrl {
     alert.handler = alert.handler || 1;
     alert.notifications = alert.notifications || [];
 
-    var defaultName = this.panel.title + ' alert';
+    const defaultName = this.panel.title + ' alert';
     alert.name = alert.name || defaultName;
 
     this.conditionModels = _.reduce(
@@ -185,7 +185,7 @@ export class AlertTabCtrl {
     ThresholdMapper.alertToGraphThresholds(this.panel);
 
     for (const addedNotification of alert.notifications) {
-      var model = _.find(this.notifications, { id: addedNotification.id });
+      const model = _.find(this.notifications, { id: addedNotification.id });
       if (model && model.isDefault === false) {
         model.iconClass = this.getNotificationIcon(model.type);
         this.alertNotifications.push(model);
@@ -205,7 +205,7 @@ export class AlertTabCtrl {
   }
 
   graphThresholdChanged(evt) {
-    for (var condition of this.alert.conditions) {
+    for (const condition of this.alert.conditions) {
       if (condition.type === 'query') {
         condition.evaluator.params[evt.handleIndex] = evt.threshold.value;
         this.evaluatorParamsChanged();
@@ -232,12 +232,12 @@ export class AlertTabCtrl {
     let firstTarget;
     let foundTarget = null;
 
-    for (var condition of this.alert.conditions) {
+    for (const condition of this.alert.conditions) {
       if (condition.type !== 'query') {
         continue;
       }
 
-      for (var target of this.panel.targets) {
+      for (const target of this.panel.targets) {
         if (!firstTarget) {
           firstTarget = target;
         }
@@ -256,7 +256,7 @@ export class AlertTabCtrl {
         }
       }
 
-      var datasourceName = foundTarget.datasource || this.panel.datasource;
+      const datasourceName = foundTarget.datasource || this.panel.datasource;
       this.datasourceSrv.get(datasourceName).then(ds => {
         if (!ds.meta.alerting) {
           this.error = 'The datasource does not support alerting queries';
@@ -270,7 +270,7 @@ export class AlertTabCtrl {
   }
 
   buildConditionModel(source) {
-    var cm: any = { source: source, type: source.type };
+    const cm: any = { source: source, type: source.type };
 
     cm.queryPart = new QueryPart(source.query, alertDef.alertQueryDef);
     cm.reducerPart = alertDef.createReducerPart(source.reducer);
@@ -292,7 +292,7 @@ export class AlertTabCtrl {
         this.validateModel();
       }
       case 'get-param-options': {
-        var result = this.panel.targets.map(target => {
+        const result = this.panel.targets.map(target => {
           return this.uiSegmentSrv.newSegment({ value: target.refId });
         });
 
@@ -309,8 +309,8 @@ export class AlertTabCtrl {
         break;
       }
       case 'get-part-actions': {
-        var result = [];
-        for (var type of alertDef.reducerTypes) {
+        const result = [];
+        for (const type of alertDef.reducerTypes) {
           if (type.value !== conditionModel.source.reducer.type) {
             result.push(type);
           }
@@ -321,7 +321,7 @@ export class AlertTabCtrl {
   }
 
   addCondition(type) {
-    var condition = this.buildDefaultCondition();
+    const condition = this.buildDefaultCondition();
     // add to persited model
     this.alert.conditions.push(condition);
     // add to view model
@@ -406,7 +406,7 @@ export class AlertTabCtrl {
     this.testing = true;
     this.testResult = false;
 
-    var payload = {
+    const payload = {
       dashboard: this.dashboardSrv.getCurrent().getSaveModelClone(),
       panelId: this.panelCtrl.panel.id,
     };

public/app/features/alerting/threshold_mapper.ts

@@ -6,8 +6,8 @@ export class ThresholdMapper {
         continue;
       }
 
-      var evaluator = condition.evaluator;
-      var thresholds = (panel.thresholds = []);
+      const evaluator = condition.evaluator;
+      const thresholds = (panel.thresholds = []);
 
       switch (evaluator.type) {
         case 'gt': {
@@ -51,13 +51,13 @@ export class ThresholdMapper {
       break;
     }
 
-    for (var t of panel.thresholds) {
+    for (const t of panel.thresholds) {
       t.fill = true;
       t.line = true;
       t.colorMode = 'critical';
     }
 
-    var updated = true;
+    const updated = true;
     return updated;
   }
 }

public/app/features/annotations/annotation_tooltip.ts

@@ -21,16 +21,16 @@ export function annotationTooltipDirective($sanitize, dashboardSrv, contextSrv,
       onEdit: '&',
     },
     link: function(scope, element) {
-      var event = scope.event;
+      const event = scope.event;
       var title = event.title;
       var text = event.text;
-      var dashboard = dashboardSrv.getCurrent();
+      const dashboard = dashboardSrv.getCurrent();
 
       var tooltip = '<div class="graph-annotation">';
       var titleStateClass = '';
 
       if (event.alertId) {
-        var stateModel = alertDef.getStateDisplayModel(event.newState);
+        const stateModel = alertDef.getStateDisplayModel(event.newState);
         titleStateClass = stateModel.stateClass;
         title = `<i class="icon-gf ${stateModel.iconClass}"></i> ${stateModel.text}`;
         text = alertDef.getAlertAnnotationInfo(event);
@@ -70,7 +70,7 @@ export function annotationTooltipDirective($sanitize, dashboardSrv, contextSrv,
         tooltip += '<div>' + sanitizeString(text.replace(/\n/g, '<br>')) + '</div>';
       }
 
-      var tags = event.tags;
+      const tags = event.tags;
 
       if (tags && tags.length) {
         scope.tags = tags;
@@ -81,7 +81,7 @@ export function annotationTooltipDirective($sanitize, dashboardSrv, contextSrv,
       tooltip += '</div>';
       tooltip += '</div>';
 
-      var $tooltip = $(tooltip);
+      const $tooltip = $(tooltip);
       $tooltip.appendTo(element);
 
       $compile(element.contents())(scope);

public/app/features/annotations/annotations_srv.ts

@@ -40,7 +40,7 @@ export class AnnotationsSrv {
         annotations = makeRegions(annotations, options);
 
         // look for alert state for this panel
-        var alertState = _.find(results[1], { panelId: options.panel.id });
+        const alertState = _.find(results[1], { panelId: options.panel.id });
 
         return {
           annotations: annotations,
@@ -82,14 +82,14 @@ export class AnnotationsSrv {
   }
 
   getGlobalAnnotations(options) {
-    var dashboard = options.dashboard;
+    const dashboard = options.dashboard;
 
     if (this.globalAnnotationsPromise) {
       return this.globalAnnotationsPromise;
     }
 
-    var range = this.timeSrv.timeRange();
-    var promises = [];
+    const range = this.timeSrv.timeRange();
+    const promises = [];
 
     for (const annotation of dashboard.annotations.list) {
       if (!annotation.enable) {
@@ -155,7 +155,7 @@ export class AnnotationsSrv {
       delete annotation.snapshotData;
     }
 
-    for (var item of results) {
+    for (const item of results) {
       item.source = annotation;
     }
     return results;

public/app/features/annotations/editor_ctrl.ts

@@ -81,7 +81,7 @@ export class AnnotationsEditorCtrl {
   }
 
   removeAnnotation(annotation) {
-    var index = _.indexOf(this.annotations, annotation);
+    const index = _.indexOf(this.annotations, annotation);
     this.annotations.splice(index, 1);
   }
 

public/app/features/annotations/event_manager.ts

@@ -55,7 +55,7 @@ export class EventManager {
       return;
     }
 
-    var types = {
+    const types = {
       $__alerting: {
         color: ALERTING_COLOR,
         position: 'BOTTOM',
@@ -103,7 +103,7 @@ export class EventManager {
     } else {
       // annotations from query
       for (var i = 0; i < annotations.length; i++) {
-        var item = annotations[i];
+        const item = annotations[i];
 
         // add properties used by jquery flot events
         item.min = item.time;

public/app/features/dashboard/dashboard_migration.ts

@@ -19,8 +19,8 @@ export class DashboardMigrator {
 
   updateSchema(old) {
     var i, j, k, n;
-    var oldVersion = this.dashboard.schemaVersion;
-    var panelUpgrades = [];
+    const oldVersion = this.dashboard.schemaVersion;
+    const panelUpgrades = [];
     this.dashboard.schemaVersion = 16;
 
     if (oldVersion === this.dashboard.schemaVersion) {
@@ -108,7 +108,7 @@ export class DashboardMigrator {
 
     if (oldVersion < 6) {
       // move pulldowns to new schema
-      var annotations = _.find(old.pulldowns, { type: 'annotations' });
+      const annotations = _.find(old.pulldowns, { type: 'annotations' });
 
       if (annotations) {
         this.dashboard.annotations = {
@@ -118,7 +118,7 @@ export class DashboardMigrator {
 
       // update template variables
       for (i = 0; i < this.dashboard.templating.list.length; i++) {
-        var variable = this.dashboard.templating.list[i];
+        const variable = this.dashboard.templating.list[i];
         if (variable.datasource === void 0) {
           variable.datasource = null;
         }
@@ -162,7 +162,7 @@ export class DashboardMigrator {
               delete target.fill;
             } else {
               target.select = _.map(target.fields, function(field) {
-                var parts = [];
+                const parts = [];
                 parts.push({ type: 'field', params: [field.name] });
                 parts.push({ type: field.func, params: [] });
                 if (field.mathExpr) {
@@ -204,7 +204,7 @@ export class DashboardMigrator {
         }
 
         if (panel.thresholds) {
-          var k = panel.thresholds.split(',');
+          const k = panel.thresholds.split(',');
 
           if (k.length >= 3) {
             k.shift();
@@ -224,7 +224,7 @@ export class DashboardMigrator {
 
         _.each(panel.styles, function(style) {
           if (style.thresholds && style.thresholds.length >= 3) {
-            var k = style.thresholds;
+            const k = style.thresholds;
             k.shift();
             style.thresholds = k;
           }
@@ -309,7 +309,7 @@ export class DashboardMigrator {
         }
 
         panel.thresholds = [];
-        var t1: any = {},
+        const t1: any = {},
           t2: any = {};
 
         if (panel.grid.threshold1 !== null) {

public/app/features/dashboard/dashboard_model.ts

@@ -145,7 +145,7 @@ export class DashboardModel {
 
     // make clone
     var copy: any = {};
-    for (var property in this) {
+    for (const property in this) {
       if (DashboardModel.nonPersistedProperties[property] || !this.hasOwnProperty(property)) {
         continue;
       }
@@ -542,7 +542,7 @@ export class DashboardModel {
   }
 
   removePanel(panel: PanelModel) {
-    var index = _.indexOf(this.panels, panel);
+    const index = _.indexOf(this.panels, panel);
     this.panels.splice(index, 1);
     this.events.emit('panel-removed', panel);
   }
@@ -559,7 +559,7 @@ export class DashboardModel {
 
   expandRows() {
     for (let i = 0; i < this.panels.length; i++) {
-      var panel = this.panels[i];
+      const panel = this.panels[i];
 
       if (panel.type !== 'row') {
         continue;
@@ -573,7 +573,7 @@ export class DashboardModel {
 
   collapseRows() {
     for (let i = 0; i < this.panels.length; i++) {
-      var panel = this.panels[i];
+      const panel = this.panels[i];
 
       if (panel.type !== 'row') {
         continue;
@@ -595,12 +595,12 @@ export class DashboardModel {
         return true;
       }
 
-      var visibleVars = _.filter(this.templating.list, variable => variable.hide !== 2);
+      const visibleVars = _.filter(this.templating.list, variable => variable.hide !== 2);
       if (visibleVars.length > 0) {
         return true;
       }
 
-      var visibleAnnotations = _.filter(this.annotations.list, annotation => annotation.hide !== true);
+      const visibleAnnotations = _.filter(this.annotations.list, annotation => annotation.hide !== true);
       if (visibleAnnotations.length > 0) {
         return true;
       }
@@ -773,7 +773,7 @@ export class DashboardModel {
   }
 
   getNextQueryLetter(panel) {
-    var letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+    const letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 
     return _.find(letters, function(refId) {
       return _.every(panel.targets, function(other) {

public/app/features/dashboard/panel_model.ts

@@ -41,7 +41,7 @@ export class PanelModel {
     this.events = new Emitter();
 
     // copy properties from persisted model
-    for (var property in model) {
+    for (const property in model) {
       this[property] = model[property];
     }
 
@@ -52,7 +52,7 @@ export class PanelModel {
 
   getSaveModel() {
     const model: any = {};
-    for (var property in this) {
+    for (const property in this) {
       if (notPersistedProperties[property] || !this.hasOwnProperty(property)) {
         continue;
       }

public/app/features/panel/metrics_panel_ctrl.ts

@@ -164,7 +164,7 @@ class MetricsPanelCtrl extends PanelCtrl {
       intervalOverride = this.datasource.interval;
     }
 
-    var res = kbn.calculateInterval(this.range, this.resolution, intervalOverride);
+    const res = kbn.calculateInterval(this.range, this.resolution, intervalOverride);
     this.interval = res.interval;
     this.intervalMs = res.intervalMs;
   }
@@ -174,15 +174,15 @@ class MetricsPanelCtrl extends PanelCtrl {
 
     // check panel time overrrides
     if (this.panel.timeFrom) {
-      var timeFromInterpolated = this.templateSrv.replace(this.panel.timeFrom, this.panel.scopedVars);
-      var timeFromInfo = rangeUtil.describeTextRange(timeFromInterpolated);
+      const timeFromInterpolated = this.templateSrv.replace(this.panel.timeFrom, this.panel.scopedVars);
+      const timeFromInfo = rangeUtil.describeTextRange(timeFromInterpolated);
       if (timeFromInfo.invalid) {
         this.timeInfo = 'invalid time override';
         return;
       }
 
       if (_.isString(this.range.raw.from)) {
-        var timeFromDate = dateMath.parse(timeFromInfo.from);
+        const timeFromDate = dateMath.parse(timeFromInfo.from);
         this.timeInfo = timeFromInfo.display;
         this.range.from = timeFromDate;
         this.range.to = dateMath.parse(timeFromInfo.to);
@@ -192,14 +192,14 @@ class MetricsPanelCtrl extends PanelCtrl {
     }
 
     if (this.panel.timeShift) {
-      var timeShiftInterpolated = this.templateSrv.replace(this.panel.timeShift, this.panel.scopedVars);
-      var timeShiftInfo = rangeUtil.describeTextRange(timeShiftInterpolated);
+      const timeShiftInterpolated = this.templateSrv.replace(this.panel.timeShift, this.panel.scopedVars);
+      const timeShiftInfo = rangeUtil.describeTextRange(timeShiftInterpolated);
       if (timeShiftInfo.invalid) {
         this.timeInfo = 'invalid timeshift';
         return;
       }
 
-      var timeShift = '-' + timeShiftInterpolated;
+      const timeShift = '-' + timeShiftInterpolated;
       this.timeInfo += ' timeshift ' + timeShift;
       this.range.from = dateMath.parseDateMath(timeShift, this.range.from, false);
       this.range.to = dateMath.parseDateMath(timeShift, this.range.to, true);
@@ -220,12 +220,12 @@ class MetricsPanelCtrl extends PanelCtrl {
 
     // make shallow copy of scoped vars,
     // and add built in variables interval and interval_ms
-    var scopedVars = Object.assign({}, this.panel.scopedVars, {
+    const scopedVars = Object.assign({}, this.panel.scopedVars, {
       __interval: { text: this.interval, value: this.interval },
       __interval_ms: { text: this.intervalMs, value: this.intervalMs },
     });
 
-    var metricsQuery = {
+    const metricsQuery = {
       timezone: this.dashboard.getTimezone(),
       panelId: this.panel.id,
       dashboardId: this.dashboard.id,
@@ -343,14 +343,14 @@ class MetricsPanelCtrl extends PanelCtrl {
   }
 
   removeQuery(target) {
-    var index = _.indexOf(this.panel.targets, target);
+    const index = _.indexOf(this.panel.targets, target);
     this.panel.targets.splice(index, 1);
     this.nextRefId = this.dashboard.getNextQueryLetter(this.panel);
     this.refresh();
   }
 
   moveQuery(target, direction) {
-    var index = _.indexOf(this.panel.targets, target);
+    const index = _.indexOf(this.panel.targets, target);
     _.move(this.panel.targets, index, index + direction);
   }
 }

public/app/features/panel/metrics_tab.ts

@@ -92,7 +92,7 @@ export class MetricsTabCtrl {
     this.helpOpen = !this.helpOpen;
 
     this.backendSrv.get(`/api/plugins/${this.datasourceInstance.meta.id}/markdown/query_help`).then(res => {
-      var md = new Remarkable();
+      const md = new Remarkable();
       this.helpHtml = this.$sce.trustAsHtml(md.render(res));
     });
   }

public/app/features/panel/panel_ctrl.ts

@@ -43,7 +43,7 @@ export class PanelCtrl {
     this.events = this.panel.events;
     this.timing = {};
 
-    var plugin = config.panels[this.panel.type];
+    const plugin = config.panels[this.panel.type];
     if (plugin) {
       this.pluginId = plugin.id;
       this.pluginName = plugin.name;
@@ -105,7 +105,7 @@ export class PanelCtrl {
     this.editModeInitiated = true;
     this.events.emit('init-edit-mode', null);
 
-    var urlTab = (this.$injector.get('$routeParams').tab || '').toLowerCase();
+    const urlTab = (this.$injector.get('$routeParams').tab || '').toLowerCase();
     if (urlTab) {
       this.editorTabs.forEach((tab, i) => {
         if (tab.title.toLowerCase() === urlTab) {
@@ -117,13 +117,13 @@ export class PanelCtrl {
 
   changeTab(newIndex) {
     this.editorTabIndex = newIndex;
-    var route = this.$injector.get('$route');
+    const route = this.$injector.get('$route');
     route.current.params.tab = this.editorTabs[newIndex].title.toLowerCase();
     route.updateParams();
   }
 
   addEditorTab(title, directiveFn, index?) {
-    var editorTab = { title, directiveFn };
+    const editorTab = { title, directiveFn };
 
     if (_.isString(directiveFn)) {
       editorTab.directiveFn = function() {
@@ -225,9 +225,9 @@ export class PanelCtrl {
 
   calculatePanelHeight() {
     if (this.fullscreen) {
-      var docHeight = $(window).height();
-      var editHeight = Math.floor(docHeight * 0.4);
-      var fullscreenHeight = Math.floor(docHeight * 0.8);
+      const docHeight = $(window).height();
+      const editHeight = Math.floor(docHeight * 0.4);
+      const fullscreenHeight = Math.floor(docHeight * 0.8);
       this.containerHeight = this.editMode ? editHeight : fullscreenHeight;
     } else {
       this.containerHeight = this.panel.gridPos.h * GRID_CELL_HEIGHT + (this.panel.gridPos.h - 1) * GRID_CELL_VMARGIN;
@@ -293,7 +293,7 @@ export class PanelCtrl {
   }
 
   sharePanel() {
-    var shareScope = this.$scope.$new();
+    const shareScope = this.$scope.$new();
     shareScope.panel = this.panel;
     shareScope.dashboard = this.dashboard;
 
@@ -323,10 +323,10 @@ export class PanelCtrl {
       markdown = this.error || this.panel.description;
     }
 
-    var linkSrv = this.$injector.get('linkSrv');
-    var sanitize = this.$injector.get('$sanitize');
-    var templateSrv = this.$injector.get('templateSrv');
-    var interpolatedMarkdown = templateSrv.replace(markdown, this.panel.scopedVars);
+    const linkSrv = this.$injector.get('linkSrv');
+    const sanitize = this.$injector.get('$sanitize');
+    const templateSrv = this.$injector.get('templateSrv');
+    const interpolatedMarkdown = templateSrv.replace(markdown, this.panel.scopedVars);
     var html = '<div class="markdown-html">';
 
     html += new Remarkable().render(interpolatedMarkdown);
@@ -334,7 +334,7 @@ export class PanelCtrl {
     if (this.panel.links && this.panel.links.length > 0) {
       html += '<ul>';
       for (const link of this.panel.links) {
-        var info = linkSrv.getPanelLinkAnchorInfo(link, this.panel.scopedVars);
+        const info = linkSrv.getPanelLinkAnchorInfo(link, this.panel.scopedVars);
         html +=
           '<li><a class="panel-menu-link" href="' +
           info.href +
@@ -352,7 +352,7 @@ export class PanelCtrl {
   }
 
   openInspector() {
-    var modalScope = this.$scope.$new();
+    const modalScope = this.$scope.$new();
     modalScope.panel = this.panel;
     modalScope.dashboard = this.dashboard;
     modalScope.panelInfoHtml = this.getInfoContent({ mode: 'inspector' });

public/app/features/panellinks/link_srv.ts

@@ -7,11 +7,11 @@ export class LinkSrv {
   constructor(private templateSrv, private timeSrv) {}
 
   getLinkUrl(link) {
-    var url = this.templateSrv.replace(link.url || '');
-    var params = {};
+    const url = this.templateSrv.replace(link.url || '');
+    const params = {};
 
     if (link.keepTime) {
-      var range = this.timeSrv.timeRangeForUrl();
+      const range = this.timeSrv.timeRangeForUrl();
       params['from'] = range.from;
       params['to'] = range.to;
     }
@@ -24,7 +24,7 @@ export class LinkSrv {
   }
 
   addParamsToUrl(url, params) {
-    var paramsArray = [];
+    const paramsArray = [];
 
     _.each(params, function(value, key) {
       if (value === null) {
@@ -50,7 +50,7 @@ export class LinkSrv {
 
   appendToQueryString(url, stringToAppend) {
     if (!_.isUndefined(stringToAppend) && stringToAppend !== null && stringToAppend !== '') {
-      var pos = url.indexOf('?');
+      const pos = url.indexOf('?');
       if (pos !== -1) {
         if (url.length - pos > 1) {
           url += '&';
@@ -65,14 +65,14 @@ export class LinkSrv {
   }
 
   getAnchorInfo(link) {
-    var info: any = {};
+    const info: any = {};
     info.href = this.getLinkUrl(link);
     info.title = this.templateSrv.replace(link.title || '');
     return info;
   }
 
   getPanelLinkAnchorInfo(link, scopedVars) {
-    var info: any = {};
+    const info: any = {};
     if (link.type === 'absolute') {
       info.target = link.targetBlank ? '_blank' : '_self';
       info.href = this.templateSrv.replace(link.url || '', scopedVars);
@@ -87,14 +87,14 @@ export class LinkSrv {
       info.target = link.targetBlank ? '_blank' : '';
     } else {
       info.title = this.templateSrv.replace(link.title || '', scopedVars);
-      var slug = kbn.slugifyForUrl(link.dashboard || '');
+      const slug = kbn.slugifyForUrl(link.dashboard || '');
       info.href = 'dashboard/db/' + slug + '?';
     }
 
-    var params = {};
+    const params = {};
 
     if (link.keepTime) {
-      var range = this.timeSrv.timeRangeForUrl();
+      const range = this.timeSrv.timeRangeForUrl();
       params['from'] = range.from;
       params['to'] = range.to;
     }

public/app/features/plugins/datasource_srv.ts

@@ -95,7 +95,7 @@ export class DatasourceSrv {
   }
 
   getMetricSources(options) {
-    var metricSources = [];
+    const metricSources = [];
 
     _.each(config.datasources, function(value, key) {
       if (value.meta && value.meta.metrics) {
@@ -137,7 +137,7 @@ export class DatasourceSrv {
   addDataSourceVariables(list) {
     // look for data source variables
     for (var i = 0; i < this.templateSrv.variables.length; i++) {
-      var variable = this.templateSrv.variables[i];
+      const variable = this.templateSrv.variables[i];
       if (variable.type !== 'datasource') {
         continue;
       }
@@ -147,7 +147,7 @@ export class DatasourceSrv {
         first = config.defaultDatasource;
       }
 
-      var ds = config.datasources[first];
+      const ds = config.datasources[first];
 
       if (ds) {
         const key = `$${variable.name}`;

public/app/features/templating/variable.ts

@@ -22,7 +22,7 @@ export function containsVariable(...args: any[]) {
   }
 
   variableName = kbn.regexEscape(variableName);
-  var findVarRegex = new RegExp('\\$(' + variableName + ')(?:\\W|$)|\\[\\[(' + variableName + ')\\]\\]', 'g');
-  var match = findVarRegex.exec(str);
+  const findVarRegex = new RegExp('\\$(' + variableName + ')(?:\\W|$)|\\[\\[(' + variableName + ')\\]\\]', 'g');
+  const match = findVarRegex.exec(str);
   return match !== null;
 }

public/app/plugins/datasource/cloudwatch/datasource.ts

@@ -28,7 +28,7 @@ export default class CloudWatchDatasource {
     options = angular.copy(options);
     options.targets = this.expandTemplateVariable(options.targets, options.scopedVars, this.templateSrv);
 
-    var queries = _.filter(options.targets, item => {
+    const queries = _.filter(options.targets, item => {
       return (
         (item.id !== '' || item.hide !== true) &&
         ((!!item.region && !!item.namespace && !!item.metricName && !_.isEmpty(item.statistics)) ||
@@ -66,12 +66,12 @@ export default class CloudWatchDatasource {
 
     // No valid targets, return the empty result to save a round trip.
     if (_.isEmpty(queries)) {
-      var d = this.$q.defer();
+      const d = this.$q.defer();
       d.resolve({ data: [] });
       return d.promise;
     }
 
-    var request = {
+    const request = {
       from: options.range.from.valueOf().toString(),
       to: options.range.to.valueOf().toString(),
       queries: queries,
@@ -81,15 +81,15 @@ export default class CloudWatchDatasource {
   }
 
   getPeriod(target, options, now?) {
-    var start = this.convertToCloudWatchTime(options.range.from, false);
-    var end = this.convertToCloudWatchTime(options.range.to, true);
+    const start = this.convertToCloudWatchTime(options.range.from, false);
+    const end = this.convertToCloudWatchTime(options.range.to, true);
     now = Math.round((now || Date.now()) / 1000);
 
     var period;
-    var range = end - start;
+    const range = end - start;
 
-    var hourSec = 60 * 60;
-    var daySec = hourSec * 24;
+    const hourSec = 60 * 60;
+    const daySec = hourSec * 24;
     var periodUnit = 60;
     if (!target.period) {
       if (now - start <= daySec * 15) {
@@ -128,7 +128,7 @@ export default class CloudWatchDatasource {
 
   performTimeSeriesQuery(request) {
     return this.awsRequest('/api/tsdb/query', request).then(res => {
-      var data = [];
+      const data = [];
 
       if (res.results) {
         _.forEach(res.results, queryRes => {
@@ -152,7 +152,7 @@ export default class CloudWatchDatasource {
   }
 
   doMetricQueryRequest(subtype, parameters) {
-    var range = this.timeSrv.timeRange();
+    const range = this.timeSrv.timeRange();
     return this.awsRequest('/api/tsdb/query', {
       from: range.from.valueOf().toString(),
       to: range.to.valueOf().toString(),
@@ -227,38 +227,38 @@ export default class CloudWatchDatasource {
     var metricName;
     var filterJson;
 
-    var regionQuery = query.match(/^regions\(\)/);
+    const regionQuery = query.match(/^regions\(\)/);
     if (regionQuery) {
       return this.getRegions();
     }
 
-    var namespaceQuery = query.match(/^namespaces\(\)/);
+    const namespaceQuery = query.match(/^namespaces\(\)/);
     if (namespaceQuery) {
       return this.getNamespaces();
     }
 
-    var metricNameQuery = query.match(/^metrics\(([^\)]+?)(,\s?([^,]+?))?\)/);
+    const metricNameQuery = query.match(/^metrics\(([^\)]+?)(,\s?([^,]+?))?\)/);
     if (metricNameQuery) {
       namespace = metricNameQuery[1];
       region = metricNameQuery[3];
       return this.getMetrics(namespace, region);
     }
 
-    var dimensionKeysQuery = query.match(/^dimension_keys\(([^\)]+?)(,\s?([^,]+?))?\)/);
+    const dimensionKeysQuery = query.match(/^dimension_keys\(([^\)]+?)(,\s?([^,]+?))?\)/);
     if (dimensionKeysQuery) {
       namespace = dimensionKeysQuery[1];
       region = dimensionKeysQuery[3];
       return this.getDimensionKeys(namespace, region);
     }
 
-    var dimensionValuesQuery = query.match(
+    const dimensionValuesQuery = query.match(
       /^dimension_values\(([^,]+?),\s?([^,]+?),\s?([^,]+?),\s?([^,]+?)(,\s?(.+))?\)/
     );
     if (dimensionValuesQuery) {
       region = dimensionValuesQuery[1];
       namespace = dimensionValuesQuery[2];
       metricName = dimensionValuesQuery[3];
-      var dimensionKey = dimensionValuesQuery[4];
+      const dimensionKey = dimensionValuesQuery[4];
       filterJson = {};
       if (dimensionValuesQuery[6]) {
         filterJson = JSON.parse(this.templateSrv.replace(dimensionValuesQuery[6]));
@@ -267,17 +267,17 @@ export default class CloudWatchDatasource {
       return this.getDimensionValues(region, namespace, metricName, dimensionKey, filterJson);
     }
 
-    var ebsVolumeIdsQuery = query.match(/^ebs_volume_ids\(([^,]+?),\s?([^,]+?)\)/);
+    const ebsVolumeIdsQuery = query.match(/^ebs_volume_ids\(([^,]+?),\s?([^,]+?)\)/);
     if (ebsVolumeIdsQuery) {
       region = ebsVolumeIdsQuery[1];
-      var instanceId = ebsVolumeIdsQuery[2];
+      const instanceId = ebsVolumeIdsQuery[2];
       return this.getEbsVolumeIds(region, instanceId);
     }
 
-    var ec2InstanceAttributeQuery = query.match(/^ec2_instance_attribute\(([^,]+?),\s?([^,]+?),\s?(.+?)\)/);
+    const ec2InstanceAttributeQuery = query.match(/^ec2_instance_attribute\(([^,]+?),\s?([^,]+?),\s?(.+?)\)/);
     if (ec2InstanceAttributeQuery) {
       region = ec2InstanceAttributeQuery[1];
-      var targetAttributeName = ec2InstanceAttributeQuery[2];
+      const targetAttributeName = ec2InstanceAttributeQuery[2];
       filterJson = JSON.parse(this.templateSrv.replace(ec2InstanceAttributeQuery[3]));
       return this.getEc2InstanceAttribute(region, targetAttributeName, filterJson);
     }
@@ -286,14 +286,14 @@ export default class CloudWatchDatasource {
   }
 
   annotationQuery(options) {
-    var annotation = options.annotation;
-    var statistics = _.map(annotation.statistics, s => {
+    const annotation = options.annotation;
+    const statistics = _.map(annotation.statistics, s => {
       return this.templateSrv.replace(s);
     });
-    var defaultPeriod = annotation.prefixMatching ? '' : '300';
+    const defaultPeriod = annotation.prefixMatching ? '' : '300';
     var period = annotation.period || defaultPeriod;
     period = parseInt(period, 10);
-    var parameters = {
+    const parameters = {
       prefixMatching: annotation.prefixMatching,
       region: this.templateSrv.replace(this.getActualRegion(annotation.region)),
       namespace: this.templateSrv.replace(annotation.namespace),
@@ -346,10 +346,10 @@ export default class CloudWatchDatasource {
 
   testDatasource() {
     /* use billing metrics for test */
-    var region = this.defaultRegion;
-    var namespace = 'AWS/Billing';
-    var metricName = 'EstimatedCharges';
-    var dimensions = {};
+    const region = this.defaultRegion;
+    const namespace = 'AWS/Billing';
+    const metricName = 'EstimatedCharges';
+    const dimensions = {};
 
     return this.getDimensionValues(region, namespace, metricName, 'ServiceName', dimensions).then(
       () => {
@@ -362,7 +362,7 @@ export default class CloudWatchDatasource {
   }
 
   awsRequest(url, data) {
-    var options = {
+    const options = {
       method: 'POST',
       url: url,
       data: data,
@@ -386,15 +386,15 @@ export default class CloudWatchDatasource {
 
   getExpandedVariables(target, dimensionKey, variable, templateSrv) {
     /* if the all checkbox is marked we should add all values to the targets */
-    var allSelected = _.find(variable.options, { selected: true, text: 'All' });
-    var selectedVariables = _.filter(variable.options, v => {
+    const allSelected = _.find(variable.options, { selected: true, text: 'All' });
+    const selectedVariables = _.filter(variable.options, v => {
       if (allSelected) {
         return v.text !== 'All';
       } else {
         return v.selected;
       }
     });
-    var currentVariables = !_.isArray(variable.current.value)
+    const currentVariables = !_.isArray(variable.current.value)
       ? [variable.current]
       : variable.current.value.map(v => {
           return {
@@ -407,8 +407,8 @@ export default class CloudWatchDatasource {
         return s.value === currentVariables[0].value;
       }) || currentVariables[0].value === '$__all';
     return (useSelectedVariables ? selectedVariables : currentVariables).map(v => {
-      var t = angular.copy(target);
-      var scopedVar = {};
+      const t = angular.copy(target);
+      const scopedVar = {};
       scopedVar[variable.name] = v;
       t.refId = target.refId + '_' + v.value;
       t.dimensions[dimensionKey] = templateSrv.replace(t.dimensions[dimensionKey], scopedVar);
@@ -425,17 +425,17 @@ export default class CloudWatchDatasource {
     // Datasource and template srv logic uber-complected. This should be cleaned up.
     return _.chain(targets)
       .map(target => {
-        var dimensionKey = _.findKey(target.dimensions, v => {
+        const dimensionKey = _.findKey(target.dimensions, v => {
           return templateSrv.variableExists(v) && !_.has(scopedVars, templateSrv.getVariableName(v));
         });
 
         if (dimensionKey) {
-          var multiVariable = _.find(templateSrv.variables, variable => {
+          const multiVariable = _.find(templateSrv.variables, variable => {
             return (
               templatingVariable.containsVariable(target.dimensions[dimensionKey], variable.name) && variable.multi
             );
           });
-          var variable = _.find(templateSrv.variables, variable => {
+          const variable = _.find(templateSrv.variables, variable => {
             return templatingVariable.containsVariable(target.dimensions[dimensionKey], variable.name);
           });
           return this.getExpandedVariables(target, dimensionKey, multiVariable || variable, templateSrv);
@@ -455,7 +455,7 @@ export default class CloudWatchDatasource {
   }
 
   convertDimensionFormat(dimensions, scopedVars) {
-    var convertedDimensions = {};
+    const convertedDimensions = {};
     _.each(dimensions, (value, key) => {
       convertedDimensions[this.templateSrv.replace(key, scopedVars)] = this.templateSrv.replace(value, scopedVars);
     });

public/app/plugins/datasource/cloudwatch/query_parameter_ctrl.ts

@@ -20,7 +20,7 @@ export class CloudWatchQueryParameterCtrl {
   /** @ngInject */
   constructor($scope, templateSrv, uiSegmentSrv, datasourceSrv, $q) {
     $scope.init = function() {
-      var target = $scope.target;
+      const target = $scope.target;
       target.namespace = target.namespace || '';
       target.metricName = target.metricName || '';
       target.statistics = target.statistics || ['Average'];
@@ -106,8 +106,8 @@ export class CloudWatchQueryParameterCtrl {
     };
 
     $scope.ensurePlusButton = function(segments) {
-      var count = segments.length;
-      var lastSegment = segments[Math.max(count - 1, 0)];
+      const count = segments.length;
+      const lastSegment = segments[Math.max(count - 1, 0)];
 
       if (!lastSegment || lastSegment.type !== 'plus-button') {
         segments.push(uiSegmentSrv.newPlusButton());
@@ -119,13 +119,13 @@ export class CloudWatchQueryParameterCtrl {
         return $q.when([]);
       }
 
-      var target = $scope.target;
+      const target = $scope.target;
       var query = $q.when([]);
 
       if (segment.type === 'key' || segment.type === 'plus-button') {
         query = $scope.datasource.getDimensionKeys($scope.target.namespace, $scope.target.region);
       } else if (segment.type === 'value') {
-        var dimensionKey = $scope.dimSegments[$index - 2].value;
+        const dimensionKey = $scope.dimSegments[$index - 2].value;
         query = $scope.datasource.getDimensionValues(
           target.region,
           target.namespace,
@@ -161,12 +161,12 @@ export class CloudWatchQueryParameterCtrl {
     };
 
     $scope.syncDimSegmentsWithModel = function() {
-      var dims = {};
-      var length = $scope.dimSegments.length;
+      const dims = {};
+      const length = $scope.dimSegments.length;
 
       for (var i = 0; i < length - 2; i += 3) {
-        var keySegment = $scope.dimSegments[i];
-        var valueSegment = $scope.dimSegments[i + 2];
+        const keySegment = $scope.dimSegments[i];
+        const valueSegment = $scope.dimSegments[i + 2];
         if (!valueSegment.fake) {
           dims[keySegment.value] = valueSegment.value;
         }
@@ -212,7 +212,7 @@ export class CloudWatchQueryParameterCtrl {
 
     $scope.transformToSegments = function(addTemplateVars) {
       return function(results) {
-        var segments = _.map(results, function(segment) {
+        const segments = _.map(results, function(segment) {
           return uiSegmentSrv.newSegment({
             value: segment.text,
             expandable: segment.expandable,

public/app/plugins/datasource/elasticsearch/bucket_agg.ts

@@ -19,7 +19,7 @@ export function elasticBucketAgg() {
 export class ElasticBucketAggCtrl {
   /** @nginject */
   constructor($scope, uiSegmentSrv, $q, $rootScope) {
-    var bucketAggs = $scope.target.bucketAggs;
+    const bucketAggs = $scope.target.bucketAggs;
 
     $scope.orderByOptions = [];
 
@@ -85,7 +85,7 @@ export class ElasticBucketAggCtrl {
       $scope.bucketAggCount = bucketAggs.length;
 
       var settingsLinkText = '';
-      var settings = $scope.agg.settings || {};
+      const settings = $scope.agg.settings || {};
 
       switch ($scope.agg.type) {
         case 'terms': {
@@ -198,14 +198,14 @@ export class ElasticBucketAggCtrl {
 
     $scope.addBucketAgg = function() {
       // if last is date histogram add it before
-      var lastBucket = bucketAggs[bucketAggs.length - 1];
+      const lastBucket = bucketAggs[bucketAggs.length - 1];
       var addIndex = bucketAggs.length - 1;
 
       if (lastBucket && lastBucket.type === 'date_histogram') {
         addIndex -= 1;
       }
 
-      var id = _.reduce(
+      const id = _.reduce(
         $scope.target.bucketAggs.concat($scope.target.metrics),
         function(max, val) {
           return parseInt(val.id) > max ? parseInt(val.id) : max;
@@ -226,6 +226,6 @@ export class ElasticBucketAggCtrl {
   }
 }
 
-var module = angular.module('grafana.directives');
+const module = angular.module('grafana.directives');
 module.directive('elasticBucketAgg', elasticBucketAgg);
 module.controller('ElasticBucketAggCtrl', ElasticBucketAggCtrl);

public/app/plugins/datasource/elasticsearch/config_ctrl.ts

@@ -23,7 +23,7 @@ export class ElasticConfigCtrl {
   esVersions = [{ name: '2.x', value: 2 }, { name: '5.x', value: 5 }, { name: '5.6+', value: 56 }];
 
   indexPatternTypeChanged() {
-    var def = _.find(this.indexPatternTypes, {
+    const def = _.find(this.indexPatternTypes, {
       value: this.current.jsonData.interval,
     });
     this.current.database = def.example || 'es-index-name';

public/app/plugins/datasource/elasticsearch/datasource.ts

@@ -37,7 +37,7 @@ export class ElasticDatasource {
   }
 
   private request(method, url, data?) {
-    var options: any = {
+    const options: any = {
       url: this.url + '/' + url,
       method: method,
       data: data,
@@ -56,8 +56,8 @@ export class ElasticDatasource {
   }
 
   private get(url) {
-    var range = this.timeSrv.timeRange();
-    var index_list = this.indexPattern.getIndexList(range.from.valueOf(), range.to.valueOf());
+    const range = this.timeSrv.timeRange();
+    const index_list = this.indexPattern.getIndexList(range.from.valueOf(), range.to.valueOf());
     if (_.isArray(index_list) && index_list.length) {
       return this.request('GET', index_list[0] + url).then(function(results) {
         results.data.$$config = results.config;
@@ -90,21 +90,21 @@ export class ElasticDatasource {
   }
 
   annotationQuery(options) {
-    var annotation = options.annotation;
-    var timeField = annotation.timeField || '@timestamp';
-    var queryString = annotation.query || '*';
-    var tagsField = annotation.tagsField || 'tags';
-    var textField = annotation.textField || null;
+    const annotation = options.annotation;
+    const timeField = annotation.timeField || '@timestamp';
+    const queryString = annotation.query || '*';
+    const tagsField = annotation.tagsField || 'tags';
+    const textField = annotation.textField || null;
 
-    var range = {};
+    const range = {};
     range[timeField] = {
       from: options.range.from.valueOf(),
       to: options.range.to.valueOf(),
       format: 'epoch_millis',
     };
 
-    var queryInterpolated = this.templateSrv.replace(queryString, {}, 'lucene');
-    var query = {
+    const queryInterpolated = this.templateSrv.replace(queryString, {}, 'lucene');
+    const query = {
       bool: {
         filter: [
           { range: range },
@@ -117,7 +117,7 @@ export class ElasticDatasource {
       },
     };
 
-    var data = {
+    const data = {
       query: query,
       size: 10000,
     };
@@ -127,7 +127,7 @@ export class ElasticDatasource {
       data['fields'] = [timeField, '_source'];
     }
 
-    var header: any = {
+    const header: any = {
       search_type: 'query_then_fetch',
       ignore_unavailable: true,
     };
@@ -139,18 +139,18 @@ export class ElasticDatasource {
       header.index = this.indexPattern.getIndexList(options.range.from, options.range.to);
     }
 
-    var payload = angular.toJson(header) + '\n' + angular.toJson(data) + '\n';
+    const payload = angular.toJson(header) + '\n' + angular.toJson(data) + '\n';
 
     return this.post('_msearch', payload).then(res => {
-      var list = [];
-      var hits = res.responses[0].hits.hits;
+      const list = [];
+      const hits = res.responses[0].hits.hits;
 
-      var getFieldFromSource = function(source, fieldName) {
+      const getFieldFromSource = function(source, fieldName) {
         if (!fieldName) {
           return;
         }
 
-        var fieldNames = fieldName.split('.');
+        const fieldNames = fieldName.split('.');
         var fieldValue = source;
 
         for (var i = 0; i < fieldNames.length; i++) {
@@ -165,16 +165,16 @@ export class ElasticDatasource {
       };
 
       for (var i = 0; i < hits.length; i++) {
-        var source = hits[i]._source;
+        const source = hits[i]._source;
         var time = getFieldFromSource(source, timeField);
         if (typeof hits[i].fields !== 'undefined') {
-          var fields = hits[i].fields;
+          const fields = hits[i].fields;
           if (_.isString(fields[timeField]) || _.isNumber(fields[timeField])) {
             time = fields[timeField];
           }
         }
 
-        var event = {
+        const event = {
           annotation: annotation,
           time: moment.utc(time).valueOf(),
           text: getFieldFromSource(source, textField),
@@ -204,7 +204,7 @@ export class ElasticDatasource {
     // validate that the index exist and has date field
     return this.getFields({ type: 'date' }).then(
       function(dateFields) {
-        var timeField = _.find(dateFields, { text: this.timeField });
+        const timeField = _.find(dateFields, { text: this.timeField });
         if (!timeField) {
           return {
             status: 'error',
@@ -229,7 +229,7 @@ export class ElasticDatasource {
   }
 
   getQueryHeader(searchType, timeFrom, timeTo) {
-    var query_header: any = {
+    const query_header: any = {
       search_type: searchType,
       ignore_unavailable: true,
       index: this.indexPattern.getIndexList(timeFrom, timeTo),
@@ -243,10 +243,10 @@ export class ElasticDatasource {
   query(options) {
     var payload = '';
     var target;
-    var sentTargets = [];
+    const sentTargets = [];
 
     // add global adhoc filters to timeFilter
-    var adhocFilters = this.templateSrv.getAdhocFilters(this.name);
+    const adhocFilters = this.templateSrv.getAdhocFilters(this.name);
 
     for (var i = 0; i < options.targets.length; i++) {
       target = options.targets[i];
@@ -254,12 +254,12 @@ export class ElasticDatasource {
         continue;
       }
 
-      var queryString = this.templateSrv.replace(target.query || '*', options.scopedVars, 'lucene');
-      var queryObj = this.queryBuilder.build(target, adhocFilters, queryString);
-      var esQuery = angular.toJson(queryObj);
+      const queryString = this.templateSrv.replace(target.query || '*', options.scopedVars, 'lucene');
+      const queryObj = this.queryBuilder.build(target, adhocFilters, queryString);
+      const esQuery = angular.toJson(queryObj);
 
-      var searchType = queryObj.size === 0 && this.esVersion < 5 ? 'count' : 'query_then_fetch';
-      var header = this.getQueryHeader(searchType, options.range.from, options.range.to);
+      const searchType = queryObj.size === 0 && this.esVersion < 5 ? 'count' : 'query_then_fetch';
+      const header = this.getQueryHeader(searchType, options.range.from, options.range.to);
       payload += header + '\n';
 
       payload += esQuery + '\n';
@@ -281,7 +281,7 @@ export class ElasticDatasource {
 
   getFields(query) {
     return this.get('/_mapping').then(function(result) {
-      var typeMap = {
+      const typeMap = {
         float: 'number',
         double: 'number',
         integer: 'number',
@@ -307,12 +307,12 @@ export class ElasticDatasource {
       }
 
       // Store subfield names: [system, process, cpu, total] -> system.process.cpu.total
-      var fieldNameParts = [];
-      var fields = {};
+      const fieldNameParts = [];
+      const fields = {};
 
       function getFieldsRecursively(obj) {
-        for (var key in obj) {
-          var subObj = obj[key];
+        for (const key in obj) {
+          const subObj = obj[key];
 
           // Check mapping field for nested fields
           if (_.isObject(subObj.properties)) {
@@ -326,7 +326,7 @@ export class ElasticDatasource {
           }
 
           if (_.isString(subObj.type)) {
-            var fieldName = fieldNameParts.concat(key).join('.');
+            const fieldName = fieldNameParts.concat(key).join('.');
 
             // Hide meta-fields and check field type
             if (shouldAddField(subObj, key, query)) {
@@ -340,12 +340,12 @@ export class ElasticDatasource {
         fieldNameParts.pop();
       }
 
-      for (var indexName in result) {
-        var index = result[indexName];
+      for (const indexName in result) {
+        const index = result[indexName];
         if (index && index.mappings) {
-          var mappings = index.mappings;
-          for (var typeName in mappings) {
-            var properties = mappings[typeName].properties;
+          const mappings = index.mappings;
+          for (const typeName in mappings) {
+            const properties = mappings[typeName].properties;
             getFieldsRecursively(properties);
           }
         }
@@ -359,9 +359,9 @@ export class ElasticDatasource {
   }
 
   getTerms(queryDef) {
-    var range = this.timeSrv.timeRange();
-    var searchType = this.esVersion >= 5 ? 'query_then_fetch' : 'count';
-    var header = this.getQueryHeader(searchType, range.from, range.to);
+    const range = this.timeSrv.timeRange();
+    const searchType = this.esVersion >= 5 ? 'query_then_fetch' : 'count';
+    const header = this.getQueryHeader(searchType, range.from, range.to);
     var esQuery = angular.toJson(this.queryBuilder.getTermsQuery(queryDef));
 
     esQuery = esQuery.replace(/\$timeFrom/g, range.from.valueOf());
@@ -373,7 +373,7 @@ export class ElasticDatasource {
         return [];
       }
 
-      var buckets = res.responses[0].aggregations['1'].buckets;
+      const buckets = res.responses[0].aggregations['1'].buckets;
       return _.map(buckets, function(bucket) {
         return {
           text: bucket.key_as_string || bucket.key,

public/app/plugins/datasource/elasticsearch/elastic_response.ts

@@ -33,10 +33,10 @@ export class ElasticResponse {
             break;
           }
 
-          var firstBucket = esAgg.buckets[0];
-          var percentiles = firstBucket[metric.id].values;
+          const firstBucket = esAgg.buckets[0];
+          const percentiles = firstBucket[metric.id].values;
 
-          for (var percentileName in percentiles) {
+          for (const percentileName in percentiles) {
             newSeries = {
               datapoints: [],
               metric: 'p' + percentileName,
@@ -46,7 +46,7 @@ export class ElasticResponse {
 
             for (i = 0; i < esAgg.buckets.length; i++) {
               bucket = esAgg.buckets[i];
-              var values = bucket[metric.id].values;
+              const values = bucket[metric.id].values;
               newSeries.datapoints.push([values[percentileName], bucket.key]);
             }
             seriesList.push(newSeries);
@@ -55,7 +55,7 @@ export class ElasticResponse {
           break;
         }
         case 'extended_stats': {
-          for (var statName in metric.meta) {
+          for (const statName in metric.meta) {
             if (!metric.meta[statName]) {
               continue;
             }
@@ -69,7 +69,7 @@ export class ElasticResponse {
 
             for (i = 0; i < esAgg.buckets.length; i++) {
               bucket = esAgg.buckets[i];
-              var stats = bucket[metric.id];
+              const stats = bucket[metric.id];
 
               // add stats that are in nested obj to top level obj
               stats.std_deviation_bounds_upper = stats.std_deviation_bounds.upper;
@@ -141,12 +141,12 @@ export class ElasticResponse {
             break;
           }
           case 'extended_stats': {
-            for (var statName in metric.meta) {
+            for (const statName in metric.meta) {
               if (!metric.meta[statName]) {
                 continue;
               }
 
-              var stats = bucket[metric.id];
+              const stats = bucket[metric.id];
               // add stats that are in nested obj to top level obj
               stats.std_deviation_bounds_upper = stats.std_deviation_bounds.upper;
               stats.std_deviation_bounds_lower = stats.std_deviation_bounds.lower;
@@ -178,7 +178,7 @@ export class ElasticResponse {
   // need to recurise down the nested buckets to build series
   processBuckets(aggs, target, seriesList, table, props, depth) {
     var bucket, aggDef, esAgg, aggId;
-    var maxDepth = target.bucketAggs.length - 1;
+    const maxDepth = target.bucketAggs.length - 1;
 
     for (aggId in aggs) {
       aggDef = _.find(target.bucketAggs, { id: aggId });
@@ -195,7 +195,7 @@ export class ElasticResponse {
           this.processAggregationDocs(esAgg, aggDef, target, table, props);
         }
       } else {
-        for (var nameIndex in esAgg.buckets) {
+        for (const nameIndex in esAgg.buckets) {
           bucket = esAgg.buckets[nameIndex];
           props = _.clone(props);
           if (bucket.key !== void 0) {
@@ -225,10 +225,10 @@ export class ElasticResponse {
     var metricName = this.getMetricName(series.metric);
 
     if (target.alias) {
-      var regex = /\{\{([\s\S]+?)\}\}/g;
+      const regex = /\{\{([\s\S]+?)\}\}/g;
 
       return target.alias.replace(regex, function(match, g1, g2) {
-        var group = g1 || g2;
+        const group = g1 || g2;
 
         if (group.indexOf('term ') === 0) {
           return series.props[group.substring(5)];
@@ -248,7 +248,7 @@ export class ElasticResponse {
     }
 
     if (series.field && queryDef.isPipelineAgg(series.metric)) {
-      var appliedAgg = _.find(target.metrics, { id: series.field });
+      const appliedAgg = _.find(target.metrics, { id: series.field });
       if (appliedAgg) {
         metricName += ' ' + queryDef.describeMetric(appliedAgg);
       } else {
@@ -258,13 +258,13 @@ export class ElasticResponse {
       metricName += ' ' + series.field;
     }
 
-    var propKeys = _.keys(series.props);
+    const propKeys = _.keys(series.props);
     if (propKeys.length === 0) {
       return metricName;
     }
 
     var name = '';
-    for (var propName in series.props) {
+    for (const propName in series.props) {
       name += series.props[propName] + ' ';
     }
 
@@ -276,16 +276,16 @@ export class ElasticResponse {
   }
 
   nameSeries(seriesList, target) {
-    var metricTypeCount = _.uniq(_.map(seriesList, 'metric')).length;
+    const metricTypeCount = _.uniq(_.map(seriesList, 'metric')).length;
 
     for (var i = 0; i < seriesList.length; i++) {
-      var series = seriesList[i];
+      const series = seriesList[i];
       series.target = this.getSeriesName(series, target, metricTypeCount);
     }
   }
 
   processHits(hits, seriesList) {
-    var series = {
+    const series = {
       target: 'docs',
       type: 'docs',
       datapoints: [],
@@ -318,13 +318,13 @@ export class ElasticResponse {
   }
 
   trimDatapoints(aggregations, target) {
-    var histogram = _.find(target.bucketAggs, { type: 'date_histogram' });
+    const histogram = _.find(target.bucketAggs, { type: 'date_histogram' });
 
-    var shouldDropFirstAndLast = histogram && histogram.settings && histogram.settings.trimEdges;
+    const shouldDropFirstAndLast = histogram && histogram.settings && histogram.settings.trimEdges;
     if (shouldDropFirstAndLast) {
-      var trim = histogram.settings.trimEdges;
-      for (var prop in aggregations) {
-        var points = aggregations[prop];
+      const trim = histogram.settings.trimEdges;
+      for (const prop in aggregations) {
+        const points = aggregations[prop];
         if (points.datapoints.length > trim * 2) {
           points.datapoints = points.datapoints.slice(trim, points.datapoints.length - trim);
         }
@@ -333,7 +333,7 @@ export class ElasticResponse {
   }
 
   getErrorFromElasticResponse(response, err) {
-    var result: any = {};
+    const result: any = {};
     result.data = JSON.stringify(err, null, 4);
     if (err.root_cause && err.root_cause.length > 0 && err.root_cause[0].reason) {
       result.message = err.root_cause[0].reason;
@@ -349,10 +349,10 @@ export class ElasticResponse {
   }
 
   getTimeSeries() {
-    var seriesList = [];
+    const seriesList = [];
 
     for (var i = 0; i < this.response.responses.length; i++) {
-      var response = this.response.responses[i];
+      const response = this.response.responses[i];
       if (response.error) {
         throw this.getErrorFromElasticResponse(this.response, response.error);
       }
@@ -362,10 +362,10 @@ export class ElasticResponse {
       }
 
       if (response.aggregations) {
-        var aggregations = response.aggregations;
-        var target = this.targets[i];
-        var tmpSeriesList = [];
-        var table = new TableModel();
+        const aggregations = response.aggregations;
+        const target = this.targets[i];
+        const tmpSeriesList = [];
+        const table = new TableModel();
 
         this.processBuckets(aggregations, target, tmpSeriesList, table, {}, 0);
         this.trimDatapoints(tmpSeriesList, target);

public/app/plugins/datasource/elasticsearch/index_pattern.ts

@@ -24,15 +24,15 @@ export class IndexPattern {
       return this.pattern;
     }
 
-    var intervalInfo = intervalMap[this.interval];
-    var start = moment(from)
+    const intervalInfo = intervalMap[this.interval];
+    const start = moment(from)
       .utc()
       .startOf(intervalInfo.startOf);
-    var endEpoch = moment(to)
+    const endEpoch = moment(to)
       .utc()
       .startOf(intervalInfo.startOf)
       .valueOf();
-    var indexList = [];
+    const indexList = [];
 
     while (start.valueOf() <= endEpoch) {
       indexList.push(start.format(this.pattern));

public/app/plugins/datasource/elasticsearch/metric_agg.ts

@@ -19,7 +19,7 @@ export function elasticMetricAgg() {
 
 export class ElasticMetricAggCtrl {
   constructor($scope, uiSegmentSrv, $q, $rootScope) {
-    var metricAggs = $scope.target.metrics;
+    const metricAggs = $scope.target.metrics;
     $scope.metricAggTypes = queryDef.getMetricAggTypes($scope.esVersion);
     $scope.extendedStats = queryDef.extendedStats;
     $scope.pipelineAggOptions = [];
@@ -55,7 +55,7 @@ export class ElasticMetricAggCtrl {
         $scope.agg.pipelineAgg = $scope.agg.pipelineAgg || 'select metric';
         $scope.agg.field = $scope.agg.pipelineAgg;
 
-        var pipelineOptions = queryDef.getPipelineOptions($scope.agg);
+        const pipelineOptions = queryDef.getPipelineOptions($scope.agg);
         if (pipelineOptions.length > 0) {
           _.each(pipelineOptions, function(opt) {
             $scope.agg.settings[opt.text] = $scope.agg.settings[opt.text] || opt.default;
@@ -67,7 +67,7 @@ export class ElasticMetricAggCtrl {
       }
       switch ($scope.agg.type) {
         case 'cardinality': {
-          var precision_threshold = $scope.agg.settings.precision_threshold || '';
+          const precision_threshold = $scope.agg.settings.precision_threshold || '';
           $scope.settingsLinkText = 'Precision threshold: ' + precision_threshold;
           break;
         }
@@ -82,11 +82,11 @@ export class ElasticMetricAggCtrl {
             $scope.agg.meta.std_deviation_bounds_upper = true;
           }
 
-          var stats = _.reduce(
+          const stats = _.reduce(
             $scope.agg.meta,
             function(memo, val, key) {
               if (val) {
-                var def = _.find($scope.extendedStats, { value: key });
+                const def = _.find($scope.extendedStats, { value: key });
                 memo.push(def.text);
               }
               return memo;
@@ -115,7 +115,7 @@ export class ElasticMetricAggCtrl {
       if ($scope.aggDef.supportsInlineScript) {
         // I know this stores the inline script twice
         // but having it like this simplifes the query_builder
-        var inlineScript = $scope.agg.inlineScript;
+        const inlineScript = $scope.agg.inlineScript;
         if (inlineScript) {
           $scope.agg.settings.script = { inline: inlineScript };
         } else {
@@ -138,13 +138,13 @@ export class ElasticMetricAggCtrl {
     };
 
     $scope.updateMovingAvgModelSettings = function() {
-      var modelSettingsKeys = [];
-      var modelSettings = queryDef.getMovingAvgSettings($scope.agg.settings.model, false);
+      const modelSettingsKeys = [];
+      const modelSettings = queryDef.getMovingAvgSettings($scope.agg.settings.model, false);
       for (var i = 0; i < modelSettings.length; i++) {
         modelSettingsKeys.push(modelSettings[i].value);
       }
 
-      for (var key in $scope.agg.settings.settings) {
+      for (const key in $scope.agg.settings.settings) {
         if ($scope.agg.settings.settings[key] === null || modelSettingsKeys.indexOf(key) === -1) {
           delete $scope.agg.settings.settings[key];
         }
@@ -172,9 +172,9 @@ export class ElasticMetricAggCtrl {
     };
 
     $scope.addMetricAgg = function() {
-      var addIndex = metricAggs.length;
+      const addIndex = metricAggs.length;
 
-      var id = _.reduce(
+      const id = _.reduce(
         $scope.target.bucketAggs.concat($scope.target.metrics),
         function(max, val) {
           return parseInt(val.id) > max ? parseInt(val.id) : max;
@@ -203,6 +203,6 @@ export class ElasticMetricAggCtrl {
   }
 }
 
-var module = angular.module('grafana.directives');
+const module = angular.module('grafana.directives');
 module.directive('elasticMetricAgg', elasticMetricAgg);
 module.controller('ElasticMetricAggCtrl', ElasticMetricAggCtrl);

public/app/plugins/datasource/elasticsearch/query_builder.ts

@@ -10,7 +10,7 @@ export class ElasticQueryBuilder {
   }
 
   getRangeFilter() {
-    var filter = {};
+    const filter = {};
     filter[this.timeField] = {
       gte: '$timeFrom',
       lte: '$timeTo',
@@ -60,8 +60,8 @@ export class ElasticQueryBuilder {
   }
 
   getDateHistogramAgg(aggDef) {
-    var esAgg: any = {};
-    var settings = aggDef.settings || {};
+    const esAgg: any = {};
+    const settings = aggDef.settings || {};
     esAgg.interval = settings.interval;
     esAgg.field = this.timeField;
     esAgg.min_doc_count = settings.min_doc_count || 0;
@@ -80,8 +80,8 @@ export class ElasticQueryBuilder {
   }
 
   getHistogramAgg(aggDef) {
-    var esAgg: any = {};
-    var settings = aggDef.settings || {};
+    const esAgg: any = {};
+    const settings = aggDef.settings || {};
     esAgg.interval = settings.interval;
     esAgg.field = aggDef.field;
     esAgg.min_doc_count = settings.min_doc_count || 0;
@@ -93,9 +93,9 @@ export class ElasticQueryBuilder {
   }
 
   getFiltersAgg(aggDef) {
-    var filterObj = {};
+    const filterObj = {};
     for (var i = 0; i < aggDef.settings.filters.length; i++) {
-      var query = aggDef.settings.filters[i].query;
+      const query = aggDef.settings.filters[i].query;
       var label = aggDef.settings.filters[i].label;
       label = label === '' || label === undefined ? query : label;
       filterObj[label] = {
@@ -182,7 +182,7 @@ export class ElasticQueryBuilder {
     target.timeField = this.timeField;
 
     var i, nestedAggs, metric;
-    var query = {
+    const query = {
       size: 0,
       query: {
         bool: {
@@ -208,15 +208,15 @@ export class ElasticQueryBuilder {
         throw { message: 'Invalid query' };
       }
 
-      var size = (metric.settings && metric.settings.size) || 500;
+      const size = (metric.settings && metric.settings.size) || 500;
       return this.documentQuery(query, size);
     }
 
     nestedAggs = query;
 
     for (i = 0; i < target.bucketAggs.length; i++) {
-      var aggDef = target.bucketAggs[i];
-      var esAgg = {};
+      const aggDef = target.bucketAggs[i];
+      const esAgg = {};
 
       switch (aggDef.type) {
         case 'date_histogram': {
@@ -257,7 +257,7 @@ export class ElasticQueryBuilder {
         continue;
       }
 
-      var aggField = {};
+      const aggField = {};
       var metricAgg = null;
 
       if (queryDef.isPipelineAgg(metric.type)) {
@@ -270,7 +270,7 @@ export class ElasticQueryBuilder {
         metricAgg = { field: metric.field };
       }
 
-      for (var prop in metric.settings) {
+      for (const prop in metric.settings) {
         if (metric.settings.hasOwnProperty(prop) && metric.settings[prop] !== null) {
           metricAgg[prop] = metric.settings[prop];
         }
@@ -284,7 +284,7 @@ export class ElasticQueryBuilder {
   }
 
   getTermsQuery(queryDef) {
-    var query: any = {
+    const query: any = {
       size: 0,
       query: {
         bool: {

public/app/plugins/datasource/elasticsearch/query_ctrl.ts

@@ -21,7 +21,7 @@ export class ElasticQueryCtrl extends QueryCtrl {
   }
 
   getFields(type) {
-    var jsonStr = angular.toJson({ find: 'fields', type: type });
+    const jsonStr = angular.toJson({ find: 'fields', type: type });
     return this.datasource
       .metricFindQuery(jsonStr)
       .then(this.uiSegmentSrv.transformToSegments(false))
@@ -29,7 +29,7 @@ export class ElasticQueryCtrl extends QueryCtrl {
   }
 
   queryUpdated() {
-    var newJson = angular.toJson(this.datasource.queryBuilder.build(this.target), true);
+    const newJson = angular.toJson(this.datasource.queryBuilder.build(this.target), true);
     if (this.rawQueryOld && newJson !== this.rawQueryOld) {
       this.refresh();
     }
@@ -39,10 +39,10 @@ export class ElasticQueryCtrl extends QueryCtrl {
   }
 
   getCollapsedText() {
-    var metricAggs = this.target.metrics;
-    var bucketAggs = this.target.bucketAggs;
-    var metricAggTypes = queryDef.getMetricAggTypes(this.esVersion);
-    var bucketAggTypes = queryDef.bucketAggTypes;
+    const metricAggs = this.target.metrics;
+    const bucketAggs = this.target.bucketAggs;
+    const metricAggTypes = queryDef.getMetricAggTypes(this.esVersion);
+    const bucketAggTypes = queryDef.bucketAggTypes;
     var text = '';
 
     if (this.target.query) {
@@ -52,7 +52,7 @@ export class ElasticQueryCtrl extends QueryCtrl {
     text += 'Metrics: ';
 
     _.each(metricAggs, (metric, index) => {
-      var aggDef = _.find(metricAggTypes, { value: metric.type });
+      const aggDef = _.find(metricAggTypes, { value: metric.type });
       text += aggDef.text + '(';
       if (aggDef.requiresField) {
         text += metric.field;
@@ -65,7 +65,7 @@ export class ElasticQueryCtrl extends QueryCtrl {
         text += ' Group by: ';
       }
 
-      var aggDef = _.find(bucketAggTypes, { value: bucketAgg.type });
+      const aggDef = _.find(bucketAggTypes, { value: bucketAgg.type });
       text += aggDef.text + '(';
       if (aggDef.requiresField) {
         text += bucketAgg.field;

public/app/plugins/datasource/elasticsearch/query_def.ts

@@ -164,7 +164,7 @@ export function getPipelineOptions(metric) {
 
 export function isPipelineAgg(metricType) {
   if (metricType) {
-    var po = pipelineOptions[metricType];
+    const po = pipelineOptions[metricType];
     return po !== null && po !== undefined;
   }
 
@@ -172,7 +172,7 @@ export function isPipelineAgg(metricType) {
 }
 
 export function getPipelineAggOptions(targets) {
-  var result = [];
+  const result = [];
   _.each(targets.metrics, function(metric) {
     if (!isPipelineAgg(metric.type)) {
       result.push({ text: describeMetric(metric), value: metric.id });
@@ -183,7 +183,7 @@ export function getPipelineAggOptions(targets) {
 }
 
 export function getMovingAvgSettings(model, filtered) {
-  var filteredResult = [];
+  const filteredResult = [];
   if (filtered) {
     _.each(movingAvgModelSettings[model], function(setting) {
       if (!setting.isCheckbox) {
@@ -196,7 +196,7 @@ export function getMovingAvgSettings(model, filtered) {
 }
 
 export function getOrderByOptions(target) {
-  var metricRefs = [];
+  const metricRefs = [];
   _.each(target.metrics, function(metric) {
     if (metric.type !== 'count') {
       metricRefs.push({ text: describeMetric(metric), value: metric.id });
@@ -207,21 +207,21 @@ export function getOrderByOptions(target) {
 }
 
 export function describeOrder(order) {
-  var def = _.find(orderOptions, { value: order });
+  const def = _.find(orderOptions, { value: order });
   return def.text;
 }
 
 export function describeMetric(metric) {
-  var def = _.find(metricAggTypes, { value: metric.type });
+  const def = _.find(metricAggTypes, { value: metric.type });
   return def.text + ' ' + metric.field;
 }
 
 export function describeOrderBy(orderBy, target) {
-  var def = _.find(orderByOptions, { value: orderBy });
+  const def = _.find(orderByOptions, { value: orderBy });
   if (def) {
     return def.text;
   }
-  var metric = _.find(target.metrics, { id: orderBy });
+  const metric = _.find(target.metrics, { id: orderBy });
   if (metric) {
     return describeMetric(metric);
   } else {

public/app/plugins/datasource/grafana/datasource.ts

@@ -13,7 +13,7 @@ class GrafanaDatasource {
         maxDataPoints: options.maxDataPoints,
       })
       .then(res => {
-        var data = [];
+        const data = [];
 
         if (res.results) {
           _.forEach(res.results, queryRes => {

public/app/plugins/datasource/graphite/add_graphite_func.ts

@@ -16,16 +16,16 @@ export function graphiteAddFunc($compile) {
 
   return {
     link: function($scope, elem) {
-      var ctrl = $scope.ctrl;
+      const ctrl = $scope.ctrl;
 
-      var $input = $(inputTemplate);
-      var $button = $(buttonTemplate);
+      const $input = $(inputTemplate);
+      const $button = $(buttonTemplate);
 
       $input.appendTo(elem);
       $button.appendTo(elem);
 
       ctrl.datasource.getFuncDefs().then(function(funcDefs) {
-        var allFunctions = _.map(funcDefs, 'name').sort();
+        const allFunctions = _.map(funcDefs, 'name').sort();
 
         $scope.functionMenu = createFunctionDropDownMenu(funcDefs);
 
@@ -82,7 +82,7 @@ export function graphiteAddFunc($compile) {
       });
 
       var drop;
-      var cleanUpDrop = function() {
+      const cleanUpDrop = function() {
         if (drop) {
           drop.destroy();
           drop = null;
@@ -106,7 +106,7 @@ export function graphiteAddFunc($compile) {
               shortDesc = shortDesc.substring(0, 497) + '...';
             }
 
-            var contentElement = document.createElement('div');
+            const contentElement = document.createElement('div');
             contentElement.innerHTML = '<h4>' + funcDef.name + '</h4>' + rst2html(shortDesc);
 
             drop = new Drop({
@@ -133,7 +133,7 @@ export function graphiteAddFunc($compile) {
 angular.module('grafana.directives').directive('graphiteAddFunc', graphiteAddFunc);
 
 function createFunctionDropDownMenu(funcDefs) {
-  var categories = {};
+  const categories = {};
 
   _.forEach(funcDefs, function(funcDef) {
     if (!funcDef.category) {

public/app/plugins/datasource/graphite/datasource.ts

@@ -30,7 +30,7 @@ export function GraphiteDatasource(instanceSettings, $q, backendSrv, templateSrv
   };
 
   this.query = function(options) {
-    var graphOptions = {
+    const graphOptions = {
       from: this.translateTime(options.rangeRaw.from, false),
       until: this.translateTime(options.rangeRaw.to, true),
       targets: options.targets,
@@ -39,12 +39,12 @@ export function GraphiteDatasource(instanceSettings, $q, backendSrv, templateSrv
       maxDataPoints: options.maxDataPoints,
     };
 
-    var params = this.buildGraphiteParams(graphOptions, options.scopedVars);
+    const params = this.buildGraphiteParams(graphOptions, options.scopedVars);
     if (params.length === 0) {
       return $q.when({ data: [] });
     }
 
-    var httpOptions: any = {
+    const httpOptions: any = {
       method: 'POST',
       url: '/render',
       data: params.join('&'),
@@ -63,7 +63,7 @@ export function GraphiteDatasource(instanceSettings, $q, backendSrv, templateSrv
   };
 
   this.addTracingHeaders = function(httpOptions, options) {
-    var proxyMode = !this.url.match(/^http/);
+    const proxyMode = !this.url.match(/^http/);
     if (proxyMode) {
       httpOptions.headers['X-Dashboard-Id'] = options.dashboardId;
       httpOptions.headers['X-Panel-Id'] = options.panelId;
@@ -75,7 +75,7 @@ export function GraphiteDatasource(instanceSettings, $q, backendSrv, templateSrv
       return [];
     }
     for (var i = 0; i < result.data.length; i++) {
-      var series = result.data[i];
+      const series = result.data[i];
       for (var y = 0; y < series.datapoints.length; y++) {
         series.datapoints[y][1] *= 1000;
       }
@@ -98,8 +98,8 @@ export function GraphiteDatasource(instanceSettings, $q, backendSrv, templateSrv
   this.annotationQuery = function(options) {
     // Graphite metric as annotation
     if (options.annotation.target) {
-      var target = templateSrv.replace(options.annotation.target, {}, 'glob');
-      var graphiteQuery = {
+      const target = templateSrv.replace(options.annotation.target, {}, 'glob');
+      const graphiteQuery = {
         rangeRaw: options.rangeRaw,
         targets: [{ target: target }],
         format: 'json',
@@ -107,13 +107,13 @@ export function GraphiteDatasource(instanceSettings, $q, backendSrv, templateSrv
       };
 
       return this.query(graphiteQuery).then(function(result) {
-        var list = [];
+        const list = [];
 
         for (var i = 0; i < result.data.length; i++) {
-          var target = result.data[i];
+          const target = result.data[i];
 
           for (var y = 0; y < target.datapoints.length; y++) {
-            var datapoint = target.datapoints[y];
+            const datapoint = target.datapoints[y];
             if (!datapoint[0]) {
               continue;
             }
@@ -130,11 +130,11 @@ export function GraphiteDatasource(instanceSettings, $q, backendSrv, templateSrv
       });
     } else {
       // Graphite event as annotation
-      var tags = templateSrv.replace(options.annotation.tags);
+      const tags = templateSrv.replace(options.annotation.tags);
       return this.events({ range: options.rangeRaw, tags: tags }).then(results => {
-        var list = [];
+        const list = [];
         for (var i = 0; i < results.data.length; i++) {
-          var e = results.data[i];
+          const e = results.data[i];
 
           var tags = e.tags;
           if (_.isString(e.tags)) {
@@ -490,12 +490,12 @@ export function GraphiteDatasource(instanceSettings, $q, backendSrv, templateSrv
   this._seriesRefLetters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 
   this.buildGraphiteParams = function(options, scopedVars) {
-    var graphite_options = ['from', 'until', 'rawData', 'format', 'maxDataPoints', 'cacheTimeout'];
-    var clean_options = [],
+    const graphite_options = ['from', 'until', 'rawData', 'format', 'maxDataPoints', 'cacheTimeout'];
+    const clean_options = [],
       targets = {};
     var target, targetValue, i;
-    var regex = /\#([A-Z])/g;
-    var intervalFormatFixRegex = /'(\d+)m'/gi;
+    const regex = /\#([A-Z])/g;
+    const intervalFormatFixRegex = /'(\d+)m'/gi;
     var hasTargets = false;
 
     options['format'] = 'json';

public/app/plugins/datasource/graphite/func_editor.ts

@@ -20,10 +20,10 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
   return {
     restrict: 'A',
     link: function postLink($scope, elem) {
-      var $funcLink = $(funcSpanTemplate);
-      var $funcControls = $(funcControlsTemplate);
-      var ctrl = $scope.ctrl;
-      var func = $scope.func;
+      const $funcLink = $(funcSpanTemplate);
+      const $funcControls = $(funcControlsTemplate);
+      const ctrl = $scope.ctrl;
+      const func = $scope.func;
       var scheduledRelink = false;
       var paramCountAtLink = 0;
       var cancelBlur = null;
@@ -31,9 +31,9 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
       function clickFuncParam(paramIndex) {
         /*jshint validthis:true */
 
-        var $link = $(this);
-        var $comma = $link.prev('.comma');
-        var $input = $link.next();
+        const $link = $(this);
+        const $comma = $link.prev('.comma');
+        const $input = $link.next();
 
         $input.val(func.params[paramIndex]);
 
@@ -43,7 +43,7 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
         $input.focus();
         $input.select();
 
-        var typeahead = $input.data('typeahead');
+        const typeahead = $input.data('typeahead');
         if (typeahead) {
           $input.val('');
           typeahead.lookup();
@@ -76,14 +76,14 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
 
       function switchToLink(inputElem, paramIndex) {
         /*jshint validthis:true */
-        var $input = $(inputElem);
+        const $input = $(inputElem);
 
         clearTimeout(cancelBlur);
         cancelBlur = null;
 
-        var $link = $input.prev();
-        var $comma = $link.prev('.comma');
-        var newValue = $input.val();
+        const $link = $input.prev();
+        const $comma = $link.prev('.comma');
+        const newValue = $input.val();
 
         // remove optional empty params
         if (newValue !== '' || paramDef(paramIndex).optional) {
@@ -110,7 +110,7 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
       // this = input element
       function inputBlur(paramIndex) {
         /*jshint validthis:true */
-        var inputElem = this;
+        const inputElem = this;
         // happens long before the click event on the typeahead options
         // need to have long delay because the blur
         cancelBlur = setTimeout(function() {
@@ -151,7 +151,7 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
           },
         });
 
-        var typeahead = $input.data('typeahead');
+        const typeahead = $input.data('typeahead');
         typeahead.lookup = function() {
           this.query = this.$element.val() || '';
           return this.process(this.source);
@@ -159,7 +159,7 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
       }
 
       function toggleFuncControls() {
-        var targetDiv = elem.closest('.tight-form');
+        const targetDiv = elem.closest('.tight-form');
 
         if (elem.hasClass('show-function-controls')) {
           elem.removeClass('show-function-controls');
@@ -178,8 +178,8 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
         $funcControls.appendTo(elem);
         $funcLink.appendTo(elem);
 
-        var defParams = _.clone(func.def.params);
-        var lastParam = _.last(func.def.params);
+        const defParams = _.clone(func.def.params);
+        const lastParam = _.last(func.def.params);
 
         while (func.params.length >= defParams.length && lastParam && lastParam.multiple) {
           defParams.push(_.assign({}, lastParam, { optional: true }));
@@ -192,7 +192,7 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
 
           var paramValue = templateSrv.highlightVariablesAsHtml(func.params[index]);
 
-          var last = index >= func.params.length - 1 && param.optional && !paramValue;
+          const last = index >= func.params.length - 1 && param.optional && !paramValue;
           if (last && param.multiple) {
             paramValue = '+';
           }
@@ -201,14 +201,14 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
             $('<span class="comma' + (last ? ' query-part__last' : '') + '">, </span>').appendTo(elem);
           }
 
-          var $paramLink = $(
+          const $paramLink = $(
             '<a ng-click="" class="graphite-func-param-link' +
               (last ? ' query-part__last' : '') +
               '">' +
               (paramValue || '&nbsp;') +
               '</a>'
           );
-          var $input = $(paramTemplate);
+          const $input = $(paramTemplate);
           $input.attr('placeholder', param.name);
 
           paramCountAtLink++;
@@ -251,7 +251,7 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
 
       function registerFuncControlsActions() {
         $funcControls.click(function(e) {
-          var $target = $(e.target);
+          const $target = $(e.target);
           if ($target.hasClass('fa-remove')) {
             toggleFuncControls();
             $scope.$apply(function() {
@@ -277,7 +277,7 @@ export function graphiteFuncEditor($compile, templateSrv, popoverSrv) {
           }
 
           if ($target.hasClass('fa-question-circle')) {
-            var funcDef = ctrl.datasource.getFuncDef(func.def.name);
+            const funcDef = ctrl.datasource.getFuncDef(func.def.name);
             if (funcDef && funcDef.description) {
               popoverSrv.show({
                 element: e.target,

public/app/plugins/datasource/graphite/gfunc.ts

@@ -1,7 +1,7 @@
 import _ from 'lodash';
 import { isVersionGtOrEq } from 'app/core/utils/version';
 
-var index = {};
+const index = {};
 
 function addFuncDef(funcDef) {
   funcDef.params = funcDef.params || [];
@@ -13,7 +13,7 @@ function addFuncDef(funcDef) {
   }
 }
 
-var optionalSeriesRefArgs = [{ name: 'other', type: 'value_or_series', optional: true, multiple: true }];
+const optionalSeriesRefArgs = [{ name: 'other', type: 'value_or_series', optional: true, multiple: true }];
 
 addFuncDef({
   name: 'scaleToSeconds',
@@ -962,9 +962,9 @@ export class FuncInstance {
   }
 
   render(metricExp) {
-    var str = this.def.name + '(';
+    const str = this.def.name + '(';
 
-    var parameters = _.map(
+    const parameters = _.map(
       this.params,
       function(value, index) {
         var paramType;
@@ -1063,7 +1063,7 @@ function getFuncDef(name, idx?) {
 }
 
 function getFuncDefs(graphiteVersion, idx?) {
-  var funcs = {};
+  const funcs = {};
   _.forEach(idx || index, function(funcDef) {
     if (isVersionRelatedFunction(funcDef, graphiteVersion)) {
       funcs[funcDef.name] = _.assign({}, funcDef, {
@@ -1078,7 +1078,7 @@ function getFuncDefs(graphiteVersion, idx?) {
 
 // parse response from graphite /functions endpoint into internal format
 function parseFuncDefs(rawDefs) {
-  var funcDefs = {};
+  const funcDefs = {};
 
   _.forEach(rawDefs || {}, (funcDef, funcName) => {
     // skip graphite graph functions
@@ -1095,7 +1095,7 @@ function parseFuncDefs(rawDefs) {
         .replace(/.. code-block *:: *none/g, '.. code-block::');
     }
 
-    var func = {
+    const func = {
       name: funcDef.name,
       description: description,
       category: funcDef.group,
@@ -1120,7 +1120,7 @@ function parseFuncDefs(rawDefs) {
     }
 
     _.forEach(funcDef.params, rawParam => {
-      var param = {
+      const param = {
         name: rawParam.name,
         type: 'string',
         optional: !rawParam.required,

public/app/plugins/datasource/graphite/graphite_query.ts

@@ -33,8 +33,8 @@ export default class GraphiteQuery {
       return;
     }
 
-    var parser = new Parser(this.target.target);
-    var astNode = parser.getAst();
+    const parser = new Parser(this.target.target);
+    const astNode = parser.getAst();
     if (astNode === null) {
       this.checkOtherSegmentsIndex = 0;
       return;
@@ -69,7 +69,7 @@ export default class GraphiteQuery {
   }
 
   getSegmentPathUpTo(index) {
-    var arr = this.segments.slice(0, index);
+    const arr = this.segments.slice(0, index);
 
     return _.reduce(
       arr,
@@ -87,7 +87,7 @@ export default class GraphiteQuery {
 
     switch (astNode.type) {
       case 'function':
-        var innerFunc = this.datasource.createFuncInstance(astNode.name, {
+        const innerFunc = this.datasource.createFuncInstance(astNode.name, {
           withDefaultParams: false,
         });
         _.each(astNode.params, param => {
@@ -133,7 +133,7 @@ export default class GraphiteQuery {
   }
 
   moveAliasFuncLast() {
-    var aliasFunc = _.find(this.functions, function(func) {
+    const aliasFunc = _.find(this.functions, function(func) {
       return func.def.name.startsWith('alias');
     });
 
@@ -157,7 +157,7 @@ export default class GraphiteQuery {
   updateModelTarget(targets) {
     // render query
     if (!this.target.textEditor) {
-      var metricPath = this.getSegmentPathUpTo(this.segments.length).replace(/\.select metric$/, '');
+      const metricPath = this.getSegmentPathUpTo(this.segments.length).replace(/\.select metric$/, '');
       this.target.target = _.reduce(this.functions, wrapFunction, metricPath);
     }
 
@@ -173,12 +173,12 @@ export default class GraphiteQuery {
 
   updateRenderedTarget(target, targets) {
     // render nested query
-    var targetsByRefId = _.keyBy(targets, 'refId');
+    const targetsByRefId = _.keyBy(targets, 'refId');
 
     // no references to self
     delete targetsByRefId[target.refId];
 
-    var nestedSeriesRefRegex = /\#([A-Z])/g;
+    const nestedSeriesRefRegex = /\#([A-Z])/g;
     var targetWithNestedQueries = target.target;
 
     // Use ref count to track circular references
@@ -200,8 +200,8 @@ export default class GraphiteQuery {
     // Keep interpolating until there are no query references
     // The reason for the loop is that the referenced query might contain another reference to another query
     while (targetWithNestedQueries.match(nestedSeriesRefRegex)) {
-      var updated = targetWithNestedQueries.replace(nestedSeriesRefRegex, (match, g1) => {
-        var t = targetsByRefId[g1];
+      const updated = targetWithNestedQueries.replace(nestedSeriesRefRegex, (match, g1) => {
+        const t = targetsByRefId[g1];
         if (!t) {
           return match;
         }

public/app/plugins/datasource/graphite/lexer.ts

@@ -9,7 +9,7 @@ import _ from 'lodash';
 // http://www.fileformat.info/info/unicode/category/Lo/list.htm
 // http://www.fileformat.info/info/unicode/category/Nl/list.htm
 
-var unicodeLetterTable = [
+const unicodeLetterTable = [
   170,
   170,
   181,
@@ -898,7 +898,7 @@ var unicodeLetterTable = [
   195101,
 ];
 
-var identifierStartTable = [];
+const identifierStartTable = [];
 
 for (var i = 0; i < 128; i++) {
   identifierStartTable[i] =
@@ -920,7 +920,7 @@ for (var i = 0; i < 128; i++) {
     (i >= 97 && i <= 122); // a-z
 }
 
-var identifierPartTable = identifierStartTable;
+const identifierPartTable = identifierStartTable;
 
 export function Lexer(expression) {
   this.input = expression;
@@ -940,7 +940,7 @@ Lexer.prototype = {
   },
 
   tokenize: function() {
-    var list = [];
+    const list = [];
     var token;
     while ((token = this.next())) {
       list.push(token);
@@ -1037,7 +1037,7 @@ Lexer.prototype = {
       return /^[0-9a-fA-F]$/.test(str);
     }
 
-    var readUnicodeEscapeSequence = _.bind(function() {
+    const readUnicodeEscapeSequence = _.bind(function() {
       /*jshint validthis:true */
       index += 1;
 
@@ -1045,10 +1045,10 @@ Lexer.prototype = {
         return null;
       }
 
-      var ch1 = this.peek(index + 1);
-      var ch2 = this.peek(index + 2);
-      var ch3 = this.peek(index + 3);
-      var ch4 = this.peek(index + 4);
+      const ch1 = this.peek(index + 1);
+      const ch2 = this.peek(index + 2);
+      const ch3 = this.peek(index + 3);
+      const ch4 = this.peek(index + 4);
       var code;
 
       if (isHexDigit(ch1) && isHexDigit(ch2) && isHexDigit(ch3) && isHexDigit(ch4)) {
@@ -1065,10 +1065,10 @@ Lexer.prototype = {
       return null;
     }, this);
 
-    var getIdentifierStart = _.bind(function() {
+    const getIdentifierStart = _.bind(function() {
       /*jshint validthis:true */
-      var chr = this.peek(index);
-      var code = chr.charCodeAt(0);
+      const chr = this.peek(index);
+      const code = chr.charCodeAt(0);
 
       if (chr === '*') {
         index += 1;
@@ -1096,10 +1096,10 @@ Lexer.prototype = {
       return null;
     }, this);
 
-    var getIdentifierPart = _.bind(function() {
+    const getIdentifierPart = _.bind(function() {
       /*jshint validthis:true */
-      var chr = this.peek(index);
-      var code = chr.charCodeAt(0);
+      const chr = this.peek(index);
+      const code = chr.charCodeAt(0);
 
       if (code === 92) {
         return readUnicodeEscapeSequence();
@@ -1170,7 +1170,7 @@ Lexer.prototype = {
   scanNumericLiteral: function(): any {
     var index = 0;
     var value = '';
-    var length = this.input.length;
+    const length = this.input.length;
     var char = this.peek(index);
     var bad;
 
@@ -1385,7 +1385,7 @@ Lexer.prototype = {
   },
 
   scanPunctuator: function() {
-    var ch1 = this.peek();
+    const ch1 = this.peek();
 
     if (this.isPunctuator(ch1)) {
       return {
@@ -1411,7 +1411,7 @@ Lexer.prototype = {
    */
   scanStringLiteral: function() {
     /*jshint loopfunc:true */
-    var quote = this.peek();
+    const quote = this.peek();
 
     // String must start with a quote.
     if (quote !== '"' && quote !== "'") {
@@ -1434,8 +1434,8 @@ Lexer.prototype = {
         };
       }
 
-      var char = this.peek();
-      var jump = 1; // A length of a jump, after we're done
+      const char = this.peek();
+      const jump = 1; // A length of a jump, after we're done
       // parsing this character.
 
       value += char;

public/app/plugins/datasource/graphite/parser.ts

@@ -54,14 +54,14 @@ Parser.prototype = {
   },
 
   metricSegment: function() {
-    var curly = this.curlyBraceSegment();
+    const curly = this.curlyBraceSegment();
     if (curly) {
       return curly;
     }
 
     if (this.match('identifier') || this.match('number')) {
       // hack to handle float numbers in metric segments
-      var parts = this.consumeToken().value.split('.');
+      const parts = this.consumeToken().value.split('.');
       if (parts.length === 2) {
         this.tokens.splice(this.index, 0, { type: '.' });
         this.tokens.splice(this.index + 1, 0, {
@@ -86,7 +86,7 @@ Parser.prototype = {
       this.errorMark('Expected identifier after templateStart');
     }
 
-    var node = {
+    const node = {
       type: 'template',
       value: this.consumeToken().value,
     };
@@ -104,7 +104,7 @@ Parser.prototype = {
       return null;
     }
 
-    var node = {
+    const node = {
       type: 'metric',
       segments: [],
     };
@@ -114,7 +114,7 @@ Parser.prototype = {
     while (this.match('.')) {
       this.consumeToken();
 
-      var segment = this.metricSegment();
+      const segment = this.metricSegment();
       if (!segment) {
         this.errorMark('Expected metric identifier');
       }
@@ -130,7 +130,7 @@ Parser.prototype = {
       return null;
     }
 
-    var node: any = {
+    const node: any = {
       type: 'function',
       name: this.consumeToken().value,
     };
@@ -165,7 +165,7 @@ Parser.prototype = {
       return [];
     }
 
-    var param =
+    const param =
       this.functionCall() ||
       this.numericLiteral() ||
       this.seriesRefExpression() ||
@@ -186,12 +186,12 @@ Parser.prototype = {
       return null;
     }
 
-    var value = this.tokens[this.index].value;
+    const value = this.tokens[this.index].value;
     if (!value.match(/\#[A-Z]/)) {
       return null;
     }
 
-    var token = this.consumeToken();
+    const token = this.consumeToken();
 
     return {
       type: 'series-ref',
@@ -215,7 +215,7 @@ Parser.prototype = {
       return null;
     }
 
-    var token = this.consumeToken();
+    const token = this.consumeToken();
     if (token.isUnclosed) {
       throw { message: 'Unclosed string parameter', pos: token.pos };
     }
@@ -227,8 +227,8 @@ Parser.prototype = {
   },
 
   errorMark: function(text) {
-    var currentToken = this.tokens[this.index];
-    var type = currentToken ? currentToken.type : 'end of string';
+    const currentToken = this.tokens[this.index];
+    const type = currentToken ? currentToken.type : 'end of string';
     throw {
       message: text + ' instead found ' + type,
       pos: currentToken ? currentToken.pos : this.lexer.char,
@@ -242,7 +242,7 @@ Parser.prototype = {
   },
 
   matchToken: function(type, index) {
-    var token = this.tokens[this.index + index];
+    const token = this.tokens[this.index + index];
     return (token === undefined && type === '') || (token && token.type === type);
   },
 

public/app/plugins/datasource/graphite/query_ctrl.ts

@@ -72,7 +72,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
       return;
     }
 
-    var path = this.queryModel.getSegmentPathUpTo(fromIndex + 1);
+    const path = this.queryModel.getSegmentPathUpTo(fromIndex + 1);
     if (path === '') {
       return Promise.resolve();
     }
@@ -110,7 +110,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
     if (index > 0) {
       query = this.queryModel.getSegmentPathUpTo(index) + '.' + query;
     }
-    var options = {
+    const options = {
       range: this.panelCtrl.range,
       requestId: 'get-alt-segments',
     };
@@ -118,7 +118,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
     return this.datasource
       .metricFindQuery(query, options)
       .then(segments => {
-        var altSegments = _.map(segments, segment => {
+        const altSegments = _.map(segments, segment => {
           return this.uiSegmentSrv.newSegment({
             value: segment.text,
             expandable: segment.expandable,
@@ -238,7 +238,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
       return;
     }
 
-    var oldTarget = this.queryModel.target.target;
+    const oldTarget = this.queryModel.target.target;
     this.updateModelTarget();
 
     if (this.queryModel.target !== oldTarget && !this.paused) {
@@ -247,7 +247,7 @@ export class GraphiteQueryCtrl extends QueryCtrl {
   }
 
   addFunction(funcDef) {
-    var newFunc = this.datasource.createFuncInstance(funcDef, {
+    const newFunc = this.datasource.createFuncInstance(funcDef, {
       withDefaultParams: true,
     });
     newFunc.added = true;

public/app/plugins/datasource/influxdb/datasource.ts

@@ -41,9 +41,9 @@ export default class InfluxDatasource {
 
   query(options) {
     var timeFilter = this.getTimeFilter(options);
-    var scopedVars = options.scopedVars;
-    var targets = _.cloneDeep(options.targets);
-    var queryTargets = [];
+    const scopedVars = options.scopedVars;
+    const targets = _.cloneDeep(options.targets);
+    const queryTargets = [];
     var queryModel;
     var i, y;
 
@@ -71,7 +71,7 @@ export default class InfluxDatasource {
     }
 
     // add global adhoc filters to timeFilter
-    var adhocFilters = this.templateSrv.getAdhocFilters(this.name);
+    const adhocFilters = this.templateSrv.getAdhocFilters(this.name);
     if (adhocFilters.length > 0) {
       timeFilter += ' AND ' + queryModel.renderAdhocFilters(adhocFilters);
     }
@@ -87,20 +87,20 @@ export default class InfluxDatasource {
         return [];
       }
 
-      var seriesList = [];
+      const seriesList = [];
       for (i = 0; i < data.results.length; i++) {
-        var result = data.results[i];
+        const result = data.results[i];
         if (!result || !result.series) {
           continue;
         }
 
-        var target = queryTargets[i];
+        const target = queryTargets[i];
         var alias = target.alias;
         if (alias) {
           alias = this.templateSrv.replace(target.alias, options.scopedVars);
         }
 
-        var influxSeries = new InfluxSeries({
+        const influxSeries = new InfluxSeries({
           series: data.results[i].series,
           alias: alias,
         });
@@ -111,7 +111,7 @@ export default class InfluxDatasource {
             break;
           }
           default: {
-            var timeSeries = influxSeries.getTimeSeries();
+            const timeSeries = influxSeries.getTimeSeries();
             for (y = 0; y < timeSeries.length; y++) {
               seriesList.push(timeSeries[y]);
             }
@@ -131,7 +131,7 @@ export default class InfluxDatasource {
       });
     }
 
-    var timeFilter = this.getTimeFilter({ rangeRaw: options.rangeRaw });
+    const timeFilter = this.getTimeFilter({ rangeRaw: options.rangeRaw });
     var query = options.annotation.query.replace('$timeFilter', timeFilter);
     query = this.templateSrv.replace(query, null, 'regex');
 
@@ -165,20 +165,20 @@ export default class InfluxDatasource {
   }
 
   metricFindQuery(query: string, options?: any) {
-    var interpolated = this.templateSrv.replace(query, null, 'regex');
+    const interpolated = this.templateSrv.replace(query, null, 'regex');
 
     return this._seriesQuery(interpolated, options).then(_.curry(this.responseParser.parse)(query));
   }
 
   getTagKeys(options) {
-    var queryBuilder = new InfluxQueryBuilder({ measurement: '', tags: [] }, this.database);
-    var query = queryBuilder.buildExploreQuery('TAG_KEYS');
+    const queryBuilder = new InfluxQueryBuilder({ measurement: '', tags: [] }, this.database);
+    const query = queryBuilder.buildExploreQuery('TAG_KEYS');
     return this.metricFindQuery(query, options);
   }
 
   getTagValues(options) {
-    var queryBuilder = new InfluxQueryBuilder({ measurement: '', tags: [] }, this.database);
-    var query = queryBuilder.buildExploreQuery('TAG_VALUES', options.key);
+    const queryBuilder = new InfluxQueryBuilder({ measurement: '', tags: [] }, this.database);
+    const query = queryBuilder.buildExploreQuery('TAG_VALUES', options.key);
     return this.metricFindQuery(query, options);
   }
 
@@ -188,7 +188,7 @@ export default class InfluxDatasource {
     }
 
     if (options && options.range) {
-      var timeFilter = this.getTimeFilter({ rangeRaw: options.range });
+      const timeFilter = this.getTimeFilter({ rangeRaw: options.range });
       query = query.replace('$timeFilter', timeFilter);
     }
 
@@ -214,8 +214,8 @@ export default class InfluxDatasource {
   }
 
   testDatasource() {
-    var queryBuilder = new InfluxQueryBuilder({ measurement: '', tags: [] }, this.database);
-    var query = queryBuilder.buildExploreQuery('RETENTION POLICIES');
+    const queryBuilder = new InfluxQueryBuilder({ measurement: '', tags: [] }, this.database);
+    const query = queryBuilder.buildExploreQuery('RETENTION POLICIES');
 
     return this._seriesQuery(query)
       .then(res => {
@@ -295,9 +295,9 @@ export default class InfluxDatasource {
   }
 
   getTimeFilter(options) {
-    var from = this.getInfluxTime(options.rangeRaw.from, false);
-    var until = this.getInfluxTime(options.rangeRaw.to, true);
-    var fromIsAbsolute = from[from.length - 1] === 'ms';
+    const from = this.getInfluxTime(options.rangeRaw.from, false);
+    const until = this.getInfluxTime(options.rangeRaw.to, true);
+    const fromIsAbsolute = from[from.length - 1] === 'ms';
 
     if (until === 'now()' && !fromIsAbsolute) {
       return 'time >= ' + from;
@@ -312,10 +312,10 @@ export default class InfluxDatasource {
         return 'now()';
       }
 
-      var parts = /^now-(\d+)([d|h|m|s])$/.exec(date);
+      const parts = /^now-(\d+)([d|h|m|s])$/.exec(date);
       if (parts) {
-        var amount = parseInt(parts[1]);
-        var unit = parts[2];
+        const amount = parseInt(parts[1]);
+        const unit = parts[2];
         return 'now() - ' + amount + unit;
       }
       date = dateMath.parse(date, roundUp);

public/app/plugins/datasource/influxdb/influx_query.ts

@@ -50,11 +50,11 @@ export default class InfluxQuery {
   }
 
   addGroupBy(value) {
-    var stringParts = value.match(/^(\w+)\((.*)\)$/);
-    var typePart = stringParts[1];
-    var arg = stringParts[2];
-    var partModel = queryPart.create({ type: typePart, params: [arg] });
-    var partCount = this.target.groupBy.length;
+    const stringParts = value.match(/^(\w+)\((.*)\)$/);
+    const typePart = stringParts[1];
+    const arg = stringParts[2];
+    const partModel = queryPart.create({ type: typePart, params: [arg] });
+    const partCount = this.target.groupBy.length;
 
     if (partCount === 0) {
       this.target.groupBy.push(partModel.part);
@@ -74,7 +74,7 @@ export default class InfluxQuery {
   }
 
   removeGroupByPart(part, index) {
-    var categories = queryPart.getCategories();
+    const categories = queryPart.getCategories();
 
     if (part.def.type === 'time') {
       // remove fill
@@ -82,7 +82,7 @@ export default class InfluxQuery {
       // remove aggregations
       this.target.select = _.map(this.target.select, (s: any) => {
         return _.filter(s, (part: any) => {
-          var partModel = queryPart.create(part);
+          const partModel = queryPart.create(part);
           if (partModel.def.category === categories.Aggregations) {
             return false;
           }
@@ -107,11 +107,11 @@ export default class InfluxQuery {
     // if we remove the field remove the whole statement
     if (part.def.type === 'field') {
       if (this.selectModels.length > 1) {
-        var modelsIndex = _.indexOf(this.selectModels, selectParts);
+        const modelsIndex = _.indexOf(this.selectModels, selectParts);
         this.selectModels.splice(modelsIndex, 1);
       }
     } else {
-      var partIndex = _.indexOf(selectParts, part);
+      const partIndex = _.indexOf(selectParts, part);
       selectParts.splice(partIndex, 1);
     }
 
@@ -119,7 +119,7 @@ export default class InfluxQuery {
   }
 
   addSelectPart(selectParts, type) {
-    var partModel = queryPart.create({ type: type });
+    const partModel = queryPart.create({ type: type });
     partModel.def.addStrategy(selectParts, partModel, this);
     this.updatePersistedParts();
   }
@@ -184,12 +184,12 @@ export default class InfluxQuery {
       return kbn.regexEscape(value);
     }
 
-    var escapedValues = _.map(value, kbn.regexEscape);
+    const escapedValues = _.map(value, kbn.regexEscape);
     return '(' + escapedValues.join('|') + ')';
   }
 
   render(interpolate?) {
-    var target = this.target;
+    const target = this.target;
 
     if (target.rawQuery) {
       if (interpolate) {
@@ -216,7 +216,7 @@ export default class InfluxQuery {
     }
 
     query += ' FROM ' + this.getMeasurementAndPolicy(interpolate) + ' WHERE ';
-    var conditions = _.map(target.tags, (tag, index) => {
+    const conditions = _.map(target.tags, (tag, index) => {
       return this.renderTagCondition(tag, index, interpolate);
     });
 
@@ -228,7 +228,7 @@ export default class InfluxQuery {
 
     var groupBySection = '';
     for (i = 0; i < this.groupByParts.length; i++) {
-      var part = this.groupByParts[i];
+      const part = this.groupByParts[i];
       if (i > 0) {
         // for some reason fill has no separator
         groupBySection += part.def.type === 'fill' ? ' ' : ', ';
@@ -260,7 +260,7 @@ export default class InfluxQuery {
   }
 
   renderAdhocFilters(filters) {
-    var conditions = _.map(filters, (tag, index) => {
+    const conditions = _.map(filters, (tag, index) => {
       return this.renderTagCondition(tag, index, false);
     });
     return conditions.join(' ');

public/app/plugins/datasource/influxdb/influx_series.ts

@@ -13,7 +13,7 @@ export default class InfluxSeries {
   }
 
   getTimeSeries() {
-    var output = [];
+    const output = [];
     var i, j;
 
     if (this.series.length === 0) {
@@ -21,14 +21,14 @@ export default class InfluxSeries {
     }
 
     _.each(this.series, series => {
-      var columns = series.columns.length;
-      var tags = _.map(series.tags, function(value, key) {
+      const columns = series.columns.length;
+      const tags = _.map(series.tags, function(value, key) {
         return key + ': ' + value;
       });
 
       for (j = 1; j < columns; j++) {
         var seriesName = series.name;
-        var columnName = series.columns[j];
+        const columnName = series.columns[j];
         if (columnName !== 'value') {
           seriesName = seriesName + '.' + columnName;
         }
@@ -39,7 +39,7 @@ export default class InfluxSeries {
           seriesName = seriesName + ' {' + tags.join(', ') + '}';
         }
 
-        var datapoints = [];
+        const datapoints = [];
         if (series.values) {
           for (i = 0; i < series.values.length; i++) {
             datapoints[i] = [series.values[i][j], series.values[i][0]];
@@ -54,12 +54,12 @@ export default class InfluxSeries {
   }
 
   _getSeriesName(series, index) {
-    var regex = /\$(\w+)|\[\[([\s\S]+?)\]\]/g;
-    var segments = series.name.split('.');
+    const regex = /\$(\w+)|\[\[([\s\S]+?)\]\]/g;
+    const segments = series.name.split('.');
 
     return this.alias.replace(regex, function(match, g1, g2) {
-      var group = g1 || g2;
-      var segIndex = parseInt(group, 10);
+      const group = g1 || g2;
+      const segIndex = parseInt(group, 10);
 
       if (group === 'm' || group === 'measurement') {
         return series.name;
@@ -74,7 +74,7 @@ export default class InfluxSeries {
         return match;
       }
 
-      var tag = group.replace('tag_', '');
+      const tag = group.replace('tag_', '');
       if (!series.tags) {
         return match;
       }
@@ -83,12 +83,12 @@ export default class InfluxSeries {
   }
 
   getAnnotations() {
-    var list = [];
+    const list = [];
 
     _.each(this.series, series => {
       var titleCol = null;
       var timeCol = null;
-      var tagsCol = [];
+      const tagsCol = [];
       var textCol = null;
 
       _.each(series.columns, (column, index) => {
@@ -117,7 +117,7 @@ export default class InfluxSeries {
       });
 
       _.each(series.values, value => {
-        var data = {
+        const data = {
           annotation: this.annotation,
           time: +new Date(value[timeCol]),
           title: value[titleCol],
@@ -142,7 +142,7 @@ export default class InfluxSeries {
   }
 
   getTable() {
-    var table = new TableModel();
+    const table = new TableModel();
     var i, j;
 
     if (this.series.length === 0) {
@@ -168,10 +168,10 @@ export default class InfluxSeries {
 
       if (series.values) {
         for (i = 0; i < series.values.length; i++) {
-          var values = series.values[i];
-          var reordered = [values[0]];
+          const values = series.values[i];
+          const reordered = [values[0]];
           if (series.tags) {
-            for (var key in series.tags) {
+            for (const key in series.tags) {
               if (series.tags.hasOwnProperty(key)) {
                 reordered.push(series.tags[key]);
               }

public/app/plugins/datasource/influxdb/query_builder.ts

@@ -82,7 +82,7 @@ export class InfluxQueryBuilder {
     }
 
     if (this.target.tags && this.target.tags.length > 0) {
-      var whereConditions = _.reduce(
+      const whereConditions = _.reduce(
         this.target.tags,
         function(memo, tag) {
           // do not add a condition for the key we want to explore for

public/app/plugins/datasource/influxdb/query_ctrl.ts

@@ -67,11 +67,11 @@ export class InfluxQueryCtrl extends QueryCtrl {
   }
 
   buildSelectMenu() {
-    var categories = queryPart.getCategories();
+    const categories = queryPart.getCategories();
     this.selectMenu = _.reduce(
       categories,
       function(memo, cat, key) {
-        var menu = {
+        const menu = {
           text: key,
           submenu: cat.map(item => {
             return { text: item.type, value: item.type };
@@ -85,12 +85,12 @@ export class InfluxQueryCtrl extends QueryCtrl {
   }
 
   getGroupByOptions() {
-    var query = this.queryBuilder.buildExploreQuery('TAG_KEYS');
+    const query = this.queryBuilder.buildExploreQuery('TAG_KEYS');
 
     return this.datasource
       .metricFindQuery(query)
       .then(tags => {
-        var options = [];
+        const options = [];
         if (!this.queryModel.hasFill()) {
           options.push(this.uiSegmentSrv.newSegment({ value: 'fill(null)' }));
         }
@@ -133,7 +133,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
       }
     }
 
-    var plusButton = this.uiSegmentSrv.newPlusButton();
+    const plusButton = this.uiSegmentSrv.newPlusButton();
     this.groupBySegment.value = plusButton.value;
     this.groupBySegment.html = plusButton.html;
     this.panelCtrl.refresh();
@@ -147,7 +147,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
   handleSelectPartEvent(selectParts, part, evt) {
     switch (evt.name) {
       case 'get-param-options': {
-        var fieldsQuery = this.queryBuilder.buildExploreQuery('FIELDS');
+        const fieldsQuery = this.queryBuilder.buildExploreQuery('FIELDS');
         return this.datasource
           .metricFindQuery(fieldsQuery)
           .then(this.transformToSegments(true))
@@ -171,7 +171,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
   handleGroupByPartEvent(part, index, evt) {
     switch (evt.name) {
       case 'get-param-options': {
-        var tagsQuery = this.queryBuilder.buildExploreQuery('TAG_KEYS');
+        const tagsQuery = this.queryBuilder.buildExploreQuery('TAG_KEYS');
         return this.datasource
           .metricFindQuery(tagsQuery)
           .then(this.transformToSegments(true))
@@ -193,8 +193,8 @@ export class InfluxQueryCtrl extends QueryCtrl {
   }
 
   fixTagSegments() {
-    var count = this.tagSegments.length;
-    var lastSegment = this.tagSegments[Math.max(count - 1, 0)];
+    const count = this.tagSegments.length;
+    const lastSegment = this.tagSegments[Math.max(count - 1, 0)];
 
     if (!lastSegment || lastSegment.type !== 'plus-button') {
       this.tagSegments.push(this.uiSegmentSrv.newPlusButton());
@@ -207,7 +207,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
   }
 
   getPolicySegments() {
-    var policiesQuery = this.queryBuilder.buildExploreQuery('RETENTION POLICIES');
+    const policiesQuery = this.queryBuilder.buildExploreQuery('RETENTION POLICIES');
     return this.datasource
       .metricFindQuery(policiesQuery)
       .then(this.transformToSegments(false))
@@ -229,7 +229,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
   }
 
   getMeasurements(measurementFilter) {
-    var query = this.queryBuilder.buildExploreQuery('MEASUREMENTS', undefined, measurementFilter);
+    const query = this.queryBuilder.buildExploreQuery('MEASUREMENTS', undefined, measurementFilter);
     return this.datasource
       .metricFindQuery(query)
       .then(this.transformToSegments(true))
@@ -243,7 +243,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
 
   transformToSegments(addTemplateVars) {
     return results => {
-      var segments = _.map(results, segment => {
+      const segments = _.map(results, segment => {
         return this.uiSegmentSrv.newSegment({
           value: segment.text,
           expandable: segment.expandable,
@@ -271,7 +271,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
       return this.$q.when([this.uiSegmentSrv.newSegment('AND'), this.uiSegmentSrv.newSegment('OR')]);
     }
     if (segment.type === 'operator') {
-      var nextValue = this.tagSegments[index + 1].value;
+      const nextValue = this.tagSegments[index + 1].value;
       if (/^\/.*\/$/.test(nextValue)) {
         return this.$q.when(this.uiSegmentSrv.newOperators(['=~', '!~']));
       } else {
@@ -301,7 +301,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
   }
 
   getFieldSegments() {
-    var fieldsQuery = this.queryBuilder.buildExploreQuery('FIELDS');
+    const fieldsQuery = this.queryBuilder.buildExploreQuery('FIELDS');
     return this.datasource
       .metricFindQuery(fieldsQuery)
       .then(this.transformToSegments(false))
@@ -342,7 +342,7 @@ export class InfluxQueryCtrl extends QueryCtrl {
   }
 
   rebuildTargetTagConditions() {
-    var tags = [];
+    const tags = [];
     var tagIndex = 0;
     var tagOperator = '';
 

public/app/plugins/datasource/influxdb/query_part.ts

@@ -1,8 +1,8 @@
 import _ from 'lodash';
 import { QueryPartDef, QueryPart, functionRenderer, suffixRenderer } from 'app/core/components/query_part/query_part';
 
-var index = [];
-var categories = {
+const index = [];
+const categories = {
   Aggregations: [],
   Selectors: [],
   Transformations: [],
@@ -13,7 +13,7 @@ var categories = {
 };
 
 function createPart(part): any {
-  var def = index[part.type];
+  const def = index[part.type];
   if (!def) {
     throw { message: 'Could not find query part ' + part.type };
   }
@@ -26,7 +26,7 @@ function register(options: any) {
   options.category.push(index[options.type]);
 }
 
-var groupByTimeFunctions = [];
+const groupByTimeFunctions = [];
 
 function aliasRenderer(part, innerExpr) {
   return innerExpr + ' AS ' + '"' + part.params[0] + '"';
@@ -42,7 +42,7 @@ function fieldRenderer(part, innerExpr) {
 function replaceAggregationAddStrategy(selectParts, partModel) {
   // look for existing aggregation
   for (var i = 0; i < selectParts.length; i++) {
-    var part = selectParts[i];
+    const part = selectParts[i];
     if (part.def.category === categories.Aggregations) {
       if (part.def.type === partModel.def.type) {
         return;
@@ -53,9 +53,9 @@ function replaceAggregationAddStrategy(selectParts, partModel) {
       }
       // remove next aggregation if distinct was replaced
       if (part.def.type === 'distinct') {
-        var morePartsAvailable = selectParts.length >= i + 2;
+        const morePartsAvailable = selectParts.length >= i + 2;
         if (partModel.def.type !== 'count' && morePartsAvailable) {
-          var nextPart = selectParts[i + 1];
+          const nextPart = selectParts[i + 1];
           if (nextPart.def.category === categories.Aggregations) {
             selectParts.splice(i + 1, 1);
           }
@@ -82,7 +82,7 @@ function addTransformationStrategy(selectParts, partModel) {
   var i;
   // look for index to add transformation
   for (i = 0; i < selectParts.length; i++) {
-    var part = selectParts[i];
+    const part = selectParts[i];
     if (part.def.category === categories.Math || part.def.category === categories.Aliasing) {
       break;
     }
@@ -92,7 +92,7 @@ function addTransformationStrategy(selectParts, partModel) {
 }
 
 function addMathStrategy(selectParts, partModel) {
-  var partCount = selectParts.length;
+  const partCount = selectParts.length;
   if (partCount > 0) {
     // if last is math, replace it
     if (selectParts[partCount - 1].def.type === 'math') {
@@ -113,7 +113,7 @@ function addMathStrategy(selectParts, partModel) {
 }
 
 function addAliasStrategy(selectParts, partModel) {
-  var partCount = selectParts.length;
+  const partCount = selectParts.length;
   if (partCount > 0) {
     // if last is alias, replace it
     if (selectParts[partCount - 1].def.type === 'alias') {
@@ -126,7 +126,7 @@ function addAliasStrategy(selectParts, partModel) {
 
 function addFieldStrategy(selectParts, partModel, query) {
   // copy all parts
-  var parts = _.map(selectParts, function(part: any) {
+  const parts = _.map(selectParts, function(part: any) {
     return createPart({ type: part.def.type, params: _.clone(part.params) });
   });
 

public/app/plugins/datasource/influxdb/response_parser.ts

@@ -6,16 +6,16 @@ export default class ResponseParser {
       return [];
     }
 
-    var influxResults = results.results[0];
+    const influxResults = results.results[0];
     if (!influxResults.series) {
       return [];
     }
 
-    var normalizedQuery = query.toLowerCase();
-    var isValueFirst =
+    const normalizedQuery = query.toLowerCase();
+    const isValueFirst =
       normalizedQuery.indexOf('show field keys') >= 0 || normalizedQuery.indexOf('show retention policies') >= 0;
 
-    var res = {};
+    const res = {};
     _.each(influxResults.series, serie => {
       _.each(serie.values, value => {
         if (_.isArray(value)) {

public/app/plugins/datasource/mixed/datasource.ts

@@ -6,15 +6,15 @@ class MixedDatasource {
   constructor(private $q, private datasourceSrv) {}
 
   query(options) {
-    var sets = _.groupBy(options.targets, 'datasource');
-    var promises = _.map(sets, targets => {
-      var dsName = targets[0].datasource;
+    const sets = _.groupBy(options.targets, 'datasource');
+    const promises = _.map(sets, targets => {
+      const dsName = targets[0].datasource;
       if (dsName === '-- Mixed --') {
         return this.$q([]);
       }
 
       return this.datasourceSrv.get(dsName).then(function(ds) {
-        var opt = angular.copy(options);
+        const opt = angular.copy(options);
         opt.targets = targets;
         return ds.query(opt);
       });

public/app/plugins/datasource/mssql/datasource.ts

@@ -26,7 +26,7 @@ export class MssqlDatasource {
       return value;
     }
 
-    var quotedValues = _.map(value, function(val) {
+    const quotedValues = _.map(value, function(val) {
       if (typeof value === 'number') {
         return value;
       }
@@ -37,7 +37,7 @@ export class MssqlDatasource {
   }
 
   query(options) {
-    var queries = _.filter(options.targets, item => {
+    const queries = _.filter(options.targets, item => {
       return item.hide !== true;
     }).map(item => {
       return {

public/app/plugins/datasource/mssql/response_parser.ts

@@ -4,7 +4,7 @@ export default class ResponseParser {
   constructor(private $q) {}
 
   processQueryResult(res) {
-    var data = [];
+    const data = [];
 
     if (!res.data.results) {
       return { data: data };

public/app/plugins/datasource/mysql/datasource.ts

@@ -26,7 +26,7 @@ export class MysqlDatasource {
       return value;
     }
 
-    var quotedValues = _.map(value, function(val) {
+    const quotedValues = _.map(value, function(val) {
       if (typeof value === 'number') {
         return value;
       }
@@ -37,7 +37,7 @@ export class MysqlDatasource {
   }
 
   query(options) {
-    var queries = _.filter(options.targets, item => {
+    const queries = _.filter(options.targets, item => {
       return item.hide !== true;
     }).map(item => {
       return {
@@ -107,7 +107,7 @@ export class MysqlDatasource {
       format: 'table',
     };
 
-    var data = {
+    const data = {
       queries: [interpolatedQuery],
     };
 

public/app/plugins/datasource/mysql/response_parser.ts

@@ -4,7 +4,7 @@ export default class ResponseParser {
   constructor(private $q) {}
 
   processQueryResult(res) {
-    var data = [];
+    const data = [];
 
     if (!res.data.results) {
       return { data: data };

public/app/plugins/datasource/opentsdb/datasource.ts

@@ -35,9 +35,9 @@ export default class OpenTsDatasource {
 
   // Called once per panel (graph)
   query(options) {
-    var start = this.convertToTSDBTime(options.rangeRaw.from, false);
-    var end = this.convertToTSDBTime(options.rangeRaw.to, true);
-    var qs = [];
+    const start = this.convertToTSDBTime(options.rangeRaw.from, false);
+    const end = this.convertToTSDBTime(options.rangeRaw.to, true);
+    const qs = [];
 
     _.each(
       options.targets,
@@ -49,16 +49,16 @@ export default class OpenTsDatasource {
       }.bind(this)
     );
 
-    var queries = _.compact(qs);
+    const queries = _.compact(qs);
 
     // No valid targets, return the empty result to save a round trip.
     if (_.isEmpty(queries)) {
-      var d = this.$q.defer();
+      const d = this.$q.defer();
       d.resolve({ data: [] });
       return d.promise;
     }
 
-    var groupByTags = {};
+    const groupByTags = {};
     _.each(queries, function(query) {
       if (query.filters && query.filters.length > 0) {
         _.each(query.filters, function(val) {
@@ -77,8 +77,8 @@ export default class OpenTsDatasource {
 
     return this.performTimeSeriesQuery(queries, start, end).then(
       function(response) {
-        var metricToTargetMapping = this.mapMetricsToTargets(response.data, options, this.tsdbVersion);
-        var result = _.map(
+        const metricToTargetMapping = this.mapMetricsToTargets(response.data, options, this.tsdbVersion);
+        const result = _.map(
           response.data,
           function(metricData, index) {
             index = metricToTargetMapping[index];
@@ -102,14 +102,14 @@ export default class OpenTsDatasource {
   }
 
   annotationQuery(options) {
-    var start = this.convertToTSDBTime(options.rangeRaw.from, false);
-    var end = this.convertToTSDBTime(options.rangeRaw.to, true);
-    var qs = [];
-    var eventList = [];
+    const start = this.convertToTSDBTime(options.rangeRaw.from, false);
+    const end = this.convertToTSDBTime(options.rangeRaw.to, true);
+    const qs = [];
+    const eventList = [];
 
     qs.push({ aggregator: 'sum', metric: options.annotation.target });
 
-    var queries = _.compact(qs);
+    const queries = _.compact(qs);
 
     return this.performTimeSeriesQuery(queries, start, end).then(
       function(results) {
@@ -120,7 +120,7 @@ export default class OpenTsDatasource {
           }
           if (annotationObject) {
             _.each(annotationObject, function(annotation) {
-              var event = {
+              const event = {
                 text: annotation.description,
                 time: Math.floor(annotation.startTime) * 1000,
                 annotation: options.annotation,
@@ -145,7 +145,7 @@ export default class OpenTsDatasource {
     }
 
     if (target.tags && Object.keys(target.tags).length > 0) {
-      for (var tagKey in target.tags) {
+      for (const tagKey in target.tags) {
         if (this.templateSrv.variableExists(target.tags[tagKey])) {
           return true;
         }
@@ -160,7 +160,7 @@ export default class OpenTsDatasource {
     if (this.tsdbResolution === 2) {
       msResolution = true;
     }
-    var reqBody: any = {
+    const reqBody: any = {
       start: start,
       queries: queries,
       msResolution: msResolution,
@@ -175,7 +175,7 @@ export default class OpenTsDatasource {
       reqBody.end = end;
     }
 
-    var options = {
+    const options = {
       method: 'POST',
       url: this.url + '/api/query',
       data: reqBody,
@@ -190,7 +190,7 @@ export default class OpenTsDatasource {
   }
 
   _saveTagKeys(metricData) {
-    var tagKeys = Object.keys(metricData.tags);
+    const tagKeys = Object.keys(metricData.tags);
     _.each(metricData.aggregateTags, function(tag) {
       tagKeys.push(tag);
     });
@@ -209,21 +209,21 @@ export default class OpenTsDatasource {
       return this.$q.when([]);
     }
 
-    var keysArray = keys.split(',').map(function(key) {
+    const keysArray = keys.split(',').map(function(key) {
       return key.trim();
     });
-    var key = keysArray[0];
+    const key = keysArray[0];
     var keysQuery = key + '=*';
 
     if (keysArray.length > 1) {
       keysQuery += ',' + keysArray.splice(1).join(',');
     }
 
-    var m = metric + '{' + keysQuery + '}';
+    const m = metric + '{' + keysQuery + '}';
 
     return this._get('/api/search/lookup', { m: m, limit: 3000 }).then(function(result) {
       result = result.data.results;
-      var tagvs = [];
+      const tagvs = [];
       _.each(result, function(r) {
         if (tagvs.indexOf(r.tags[key]) === -1) {
           tagvs.push(r.tags[key]);
@@ -240,7 +240,7 @@ export default class OpenTsDatasource {
 
     return this._get('/api/search/lookup', { m: metric, limit: 1000 }).then(function(result) {
       result = result.data.results;
-      var tagks = [];
+      const tagks = [];
       _.each(result, function(r) {
         _.each(r.tags, function(tagv, tagk) {
           if (tagks.indexOf(tagk) === -1) {
@@ -253,7 +253,7 @@ export default class OpenTsDatasource {
   }
 
   _get(relativeUrl, params?) {
-    var options = {
+    const options = {
       method: 'GET',
       url: this.url + relativeUrl,
       params: params,
@@ -285,39 +285,39 @@ export default class OpenTsDatasource {
       return this.$q.reject(err);
     }
 
-    var responseTransform = function(result) {
+    const responseTransform = function(result) {
       return _.map(result, function(value) {
         return { text: value };
       });
     };
 
-    var metrics_regex = /metrics\((.*)\)/;
-    var tag_names_regex = /tag_names\((.*)\)/;
-    var tag_values_regex = /tag_values\((.*?),\s?(.*)\)/;
-    var tag_names_suggest_regex = /suggest_tagk\((.*)\)/;
-    var tag_values_suggest_regex = /suggest_tagv\((.*)\)/;
+    const metrics_regex = /metrics\((.*)\)/;
+    const tag_names_regex = /tag_names\((.*)\)/;
+    const tag_values_regex = /tag_values\((.*?),\s?(.*)\)/;
+    const tag_names_suggest_regex = /suggest_tagk\((.*)\)/;
+    const tag_values_suggest_regex = /suggest_tagv\((.*)\)/;
 
-    var metrics_query = interpolated.match(metrics_regex);
+    const metrics_query = interpolated.match(metrics_regex);
     if (metrics_query) {
       return this._performSuggestQuery(metrics_query[1], 'metrics').then(responseTransform);
     }
 
-    var tag_names_query = interpolated.match(tag_names_regex);
+    const tag_names_query = interpolated.match(tag_names_regex);
     if (tag_names_query) {
       return this._performMetricKeyLookup(tag_names_query[1]).then(responseTransform);
     }
 
-    var tag_values_query = interpolated.match(tag_values_regex);
+    const tag_values_query = interpolated.match(tag_values_regex);
     if (tag_values_query) {
       return this._performMetricKeyValueLookup(tag_values_query[1], tag_values_query[2]).then(responseTransform);
     }
 
-    var tag_names_suggest_query = interpolated.match(tag_names_suggest_regex);
+    const tag_names_suggest_query = interpolated.match(tag_names_suggest_regex);
     if (tag_names_suggest_query) {
       return this._performSuggestQuery(tag_names_suggest_query[1], 'tagk').then(responseTransform);
     }
 
-    var tag_values_suggest_query = interpolated.match(tag_values_suggest_regex);
+    const tag_values_suggest_query = interpolated.match(tag_values_suggest_regex);
     if (tag_values_suggest_query) {
       return this._performSuggestQuery(tag_values_suggest_query[1], 'tagv').then(responseTransform);
     }
@@ -360,8 +360,8 @@ export default class OpenTsDatasource {
   }
 
   transformMetricData(md, groupByTags, target, options, tsdbResolution) {
-    var metricLabel = this.createMetricLabel(md, target, groupByTags, options);
-    var dps = [];
+    const metricLabel = this.createMetricLabel(md, target, groupByTags, options);
+    const dps = [];
 
     // TSDB returns datapoints has a hash of ts => value.
     // Can't use _.pairs(invert()) because it stringifies keys/values
@@ -378,7 +378,7 @@ export default class OpenTsDatasource {
 
   createMetricLabel(md, target, groupByTags, options) {
     if (target.alias) {
-      var scopedVars = _.clone(options.scopedVars || {});
+      const scopedVars = _.clone(options.scopedVars || {});
       _.each(md.tags, function(value, key) {
         scopedVars['tag_' + key] = { value: value };
       });
@@ -386,7 +386,7 @@ export default class OpenTsDatasource {
     }
 
     var label = md.metric;
-    var tagData = [];
+    const tagData = [];
 
     if (!_.isEmpty(md.tags)) {
       _.each(_.toPairs(md.tags), function(tag) {
@@ -408,7 +408,7 @@ export default class OpenTsDatasource {
       return null;
     }
 
-    var query: any = {
+    const query: any = {
       metric: this.templateSrv.replace(target.metric, options.scopedVars, 'pipe'),
       aggregator: 'avg',
     };
@@ -454,7 +454,7 @@ export default class OpenTsDatasource {
     if (target.filters && target.filters.length > 0) {
       query.filters = angular.copy(target.filters);
       if (query.filters) {
-        for (var filter_key in query.filters) {
+        for (const filter_key in query.filters) {
           query.filters[filter_key].filter = this.templateSrv.replace(
             query.filters[filter_key].filter,
             options.scopedVars,
@@ -465,7 +465,7 @@ export default class OpenTsDatasource {
     } else {
       query.tags = angular.copy(target.tags);
       if (query.tags) {
-        for (var tag_key in query.tags) {
+        for (const tag_key in query.tags) {
           query.tags[tag_key] = this.templateSrv.replace(query.tags[tag_key], options.scopedVars, 'pipe');
         }
       }

public/app/plugins/datasource/opentsdb/query_ctrl.ts

@@ -161,7 +161,7 @@ export class OpenTsQueryCtrl extends QueryCtrl {
     this.errors = this.validateTarget();
 
     if (!this.errors.filters) {
-      var currentFilter = {
+      const currentFilter = {
         type: this.target.currentFilterType,
         tagk: this.target.currentFilterKey,
         filter: this.target.currentFilterValue,
@@ -198,7 +198,7 @@ export class OpenTsQueryCtrl extends QueryCtrl {
   }
 
   validateTarget() {
-    var errs: any = {};
+    const errs: any = {};
 
     if (this.target.shouldDownsample) {
       try {

public/app/plugins/datasource/postgres/datasource.ts

@@ -26,14 +26,14 @@ export class PostgresDatasource {
       return value;
     }
 
-    var quotedValues = _.map(value, function(val) {
+    const quotedValues = _.map(value, function(val) {
       return "'" + val.replace(/'/g, `''`) + "'";
     });
     return quotedValues.join(',');
   }
 
   query(options) {
-    var queries = _.filter(options.targets, item => {
+    const queries = _.filter(options.targets, item => {
       return item.hide !== true;
     }).map(item => {
       return {
@@ -103,7 +103,7 @@ export class PostgresDatasource {
       format: 'table',
     };
 
-    var data = {
+    const data = {
       queries: [interpolatedQuery],
     };
 

public/app/plugins/datasource/postgres/response_parser.ts

@@ -4,7 +4,7 @@ export default class ResponseParser {
   constructor(private $q) {}
 
   processQueryResult(res) {
-    var data = [];
+    const data = [];
 
     if (!res.data.results) {
       return { data: data };

public/app/plugins/datasource/prometheus/completer.ts

@@ -50,7 +50,7 @@ export class PromCompleter {
     }
 
     if (token.type === 'paren.lparen' && token.value === '[') {
-      var vectors = [];
+      const vectors = [];
       for (const unit of ['s', 'm', 'h']) {
         for (const value of [1, 5, 10, 30]) {
           vectors.push({
@@ -77,7 +77,7 @@ export class PromCompleter {
       return;
     }
 
-    var query = prefix;
+    const query = prefix;
 
     return this.datasource.performSuggestQuery(query, true).then(metricNames => {
       wrappedCallback(
@@ -109,7 +109,7 @@ export class PromCompleter {
     }
 
     return this.getLabelNameAndValueForExpression(metricName, 'metricName').then(result => {
-      var labelNames = this.transformToCompletions(
+      const labelNames = this.transformToCompletions(
         _.uniq(
           _.flatten(
             result.map(r => {
@@ -130,7 +130,7 @@ export class PromCompleter {
       return Promise.resolve([]);
     }
 
-    var labelNameToken = this.findToken(
+    const labelNameToken = this.findToken(
       session,
       pos.row,
       pos.column,
@@ -141,14 +141,14 @@ export class PromCompleter {
     if (!labelNameToken) {
       return Promise.resolve([]);
     }
-    var labelName = labelNameToken.value;
+    const labelName = labelNameToken.value;
 
     if (this.labelValueCache[metricName] && this.labelValueCache[metricName][labelName]) {
       return Promise.resolve(this.labelValueCache[metricName][labelName]);
     }
 
     return this.getLabelNameAndValueForExpression(metricName, 'metricName').then(result => {
-      var labelValues = this.transformToCompletions(
+      const labelValues = this.transformToCompletions(
         _.uniq(
           result.map(r => {
             return r.metric[labelName];
@@ -187,7 +187,7 @@ export class PromCompleter {
           return Promise.resolve([]);
         }
         return this.getLabelNameAndValueForExpression(expr, 'expression').then(result => {
-          var labelNames = this.transformToCompletions(
+          const labelNames = this.transformToCompletions(
             _.uniq(
               _.flatten(
                 result.map(r => {
@@ -229,7 +229,7 @@ export class PromCompleter {
             return Promise.resolve([]);
           }
           return this.getLabelNameAndValueForExpression(expr, 'expression').then(result => {
-            var labelNames = this.transformToCompletions(
+            const labelNames = this.transformToCompletions(
               _.uniq(
                 _.flatten(
                   result.map(r => {
@@ -245,7 +245,7 @@ export class PromCompleter {
         } else {
           const metricName = this.findMetricName(session, binaryOperatorToken.row, binaryOperatorToken.column);
           return this.getLabelNameAndValueForExpression(metricName, 'metricName').then(result => {
-            var labelNames = this.transformToCompletions(
+            const labelNames = this.transformToCompletions(
               _.uniq(
                 _.flatten(
                   result.map(r => {
@@ -297,7 +297,7 @@ export class PromCompleter {
     var metricName = '';
 
     var tokens;
-    var nameLabelNameToken = this.findToken(
+    const nameLabelNameToken = this.findToken(
       session,
       row,
       column,
@@ -307,12 +307,12 @@ export class PromCompleter {
     );
     if (nameLabelNameToken) {
       tokens = session.getTokens(nameLabelNameToken.row);
-      var nameLabelValueToken = tokens[nameLabelNameToken.index + 2];
+      const nameLabelValueToken = tokens[nameLabelNameToken.index + 2];
       if (nameLabelValueToken && nameLabelValueToken.type === 'string.quoted.label-matcher') {
         metricName = nameLabelValueToken.value.slice(1, -1); // cut begin/end quotation
       }
     } else {
-      var metricNameToken = this.findToken(session, row, column, 'identifier', null, null);
+      const metricNameToken = this.findToken(session, row, column, 'identifier', null, null);
       if (metricNameToken) {
         tokens = session.getTokens(metricNameToken.row);
         metricName = metricNameToken.value;

public/app/plugins/datasource/prometheus/datasource.ts

@@ -248,11 +248,11 @@ export class PrometheusDatasource {
   }
 
   _request(url, data?, options?: any) {
-    var options: any = {
+    options = _.defaults(options || {}, {
       url: this.url + url,
       method: this.httpMethod,
-      ...options,
-    };
+    });
+
     if (options.method === 'GET') {
       if (!_.isEmpty(data)) {
         options.url =
@@ -300,7 +300,7 @@ export class PrometheusDatasource {
       return prometheusSpecialRegexEscape(value);
     }
 
-    var escapedValues = _.map(value, prometheusSpecialRegexEscape);
+    const escapedValues = _.map(value, prometheusSpecialRegexEscape);
     return escapedValues.join('|');
   }
 
@@ -309,11 +309,11 @@ export class PrometheusDatasource {
   }
 
   query(options) {
-    var start = this.getPrometheusTime(options.range.from, false);
-    var end = this.getPrometheusTime(options.range.to, true);
+    const start = this.getPrometheusTime(options.range.from, false);
+    const end = this.getPrometheusTime(options.range.to, true);
 
-    var queries = [];
-    var activeTargets = [];
+    const queries = [];
+    const activeTargets = [];
 
     options = _.clone(options);
 
@@ -331,7 +331,7 @@ export class PrometheusDatasource {
       return this.$q.when({ data: [] });
     }
 
-    var allQueryPromise = _.map(queries, query => {
+    const allQueryPromise = _.map(queries, query => {
       if (!query.instant) {
         return this.performTimeSeriesQuery(query, query.start, query.end);
       } else {
@@ -382,16 +382,16 @@ export class PrometheusDatasource {
       hinting: target.hinting,
       instant: target.instant,
     };
-    var range = Math.ceil(end - start);
+    const range = Math.ceil(end - start);
 
     var interval = kbn.interval_to_seconds(options.interval);
     // Minimum interval ("Min step"), if specified for the query. or same as interval otherwise
-    var minInterval = kbn.interval_to_seconds(
+    const minInterval = kbn.interval_to_seconds(
       this.templateSrv.replace(target.interval, options.scopedVars) || options.interval
     );
-    var intervalFactor = target.intervalFactor || 1;
+    const intervalFactor = target.intervalFactor || 1;
     // Adjust the interval to take into account any specified minimum and interval factor plus Prometheus limits
-    var adjustedInterval = this.adjustInterval(interval, minInterval, range, intervalFactor);
+    const adjustedInterval = this.adjustInterval(interval, minInterval, range, intervalFactor);
     var scopedVars = { ...options.scopedVars, ...this.getRangeScopedVars() };
     // If the interval was adjusted, make a shallow copy of scopedVars with updated interval vars
     if (interval !== adjustedInterval) {
@@ -430,8 +430,8 @@ export class PrometheusDatasource {
       throw { message: 'Invalid time range' };
     }
 
-    var url = '/api/v1/query_range';
-    var data = {
+    const url = '/api/v1/query_range';
+    const data = {
       query: query.expr,
       start: start,
       end: end,
@@ -444,8 +444,8 @@ export class PrometheusDatasource {
   }
 
   performInstantQuery(query, time) {
-    var url = '/api/v1/query';
-    var data = {
+    const url = '/api/v1/query';
+    const data = {
       query: query.expr,
       time: time,
     };
@@ -456,7 +456,7 @@ export class PrometheusDatasource {
   }
 
   performSuggestQuery(query, cache = false) {
-    var url = '/api/v1/label/__name__/values';
+    const url = '/api/v1/label/__name__/values';
 
     if (cache && this.metricsNameCache && this.metricsNameCache.expire > Date.now()) {
       return this.$q.when(
@@ -488,7 +488,7 @@ export class PrometheusDatasource {
       ...this.getRangeScopedVars(),
     };
     const interpolated = this.templateSrv.replace(query, scopedVars, this.interpolateQueryExpr);
-    var metricFindQuery = new PrometheusMetricFindQuery(this, interpolated, this.timeSrv);
+    const metricFindQuery = new PrometheusMetricFindQuery(this, interpolated, this.timeSrv);
     return metricFindQuery.process();
   }
 
@@ -505,19 +505,19 @@ export class PrometheusDatasource {
   }
 
   annotationQuery(options) {
-    var annotation = options.annotation;
-    var expr = annotation.expr || '';
+    const annotation = options.annotation;
+    const expr = annotation.expr || '';
     var tagKeys = annotation.tagKeys || '';
-    var titleFormat = annotation.titleFormat || '';
-    var textFormat = annotation.textFormat || '';
+    const titleFormat = annotation.titleFormat || '';
+    const textFormat = annotation.textFormat || '';
 
     if (!expr) {
       return this.$q.when([]);
     }
 
-    var step = annotation.step || '60s';
-    var start = this.getPrometheusTime(options.range.from, false);
-    var end = this.getPrometheusTime(options.range.to, true);
+    const step = annotation.step || '60s';
+    const start = this.getPrometheusTime(options.range.from, false);
+    const end = this.getPrometheusTime(options.range.to, true);
     // Unsetting min interval
     const queryOptions = {
       ...options,
@@ -525,13 +525,13 @@ export class PrometheusDatasource {
     };
     const query = this.createQuery({ expr, interval: step }, queryOptions, start, end);
 
-    var self = this;
+    const self = this;
     return this.performTimeSeriesQuery(query, query.start, query.end).then(function(results) {
-      var eventList = [];
+      const eventList = [];
       tagKeys = tagKeys.split(',');
 
       _.each(results.data.data.result, function(series) {
-        var tags = _.chain(series.metric)
+        const tags = _.chain(series.metric)
           .filter(function(v, k) {
             return _.includes(tagKeys, k);
           })
@@ -539,7 +539,7 @@ export class PrometheusDatasource {
 
         for (const value of series.values) {
           if (value[1] === '1') {
-            var event = {
+            const event = {
               annotation: annotation,
               time: Math.floor(parseFloat(value[0])) * 1000,
               title: self.resultTransformer.renderTemplate(titleFormat, series.metric),

public/app/plugins/datasource/prometheus/metric_find_query.ts

@@ -12,11 +12,11 @@ export default class PrometheusMetricFindQuery {
   }
 
   process() {
-    var label_values_regex = /^label_values\((?:(.+),\s*)?([a-zA-Z_][a-zA-Z0-9_]+)\)\s*$/;
-    var metric_names_regex = /^metrics\((.+)\)\s*$/;
-    var query_result_regex = /^query_result\((.+)\)\s*$/;
+    const label_values_regex = /^label_values\((?:(.+),\s*)?([a-zA-Z_][a-zA-Z0-9_]+)\)\s*$/;
+    const metric_names_regex = /^metrics\((.+)\)\s*$/;
+    const query_result_regex = /^query_result\((.+)\)\s*$/;
 
-    var label_values_query = this.query.match(label_values_regex);
+    const label_values_query = this.query.match(label_values_regex);
     if (label_values_query) {
       if (label_values_query[1]) {
         return this.labelValuesQuery(label_values_query[2], label_values_query[1]);
@@ -25,12 +25,12 @@ export default class PrometheusMetricFindQuery {
       }
     }
 
-    var metric_names_query = this.query.match(metric_names_regex);
+    const metric_names_query = this.query.match(metric_names_regex);
     if (metric_names_query) {
       return this.metricNameQuery(metric_names_query[1]);
     }
 
-    var query_result_query = this.query.match(query_result_regex);
+    const query_result_query = this.query.match(query_result_regex);
     if (query_result_query) {
       return this.queryResultQuery(query_result_query[1]);
     }
@@ -52,12 +52,12 @@ export default class PrometheusMetricFindQuery {
         });
       });
     } else {
-      var start = this.datasource.getPrometheusTime(this.range.from, false);
-      var end = this.datasource.getPrometheusTime(this.range.to, true);
+      const start = this.datasource.getPrometheusTime(this.range.from, false);
+      const end = this.datasource.getPrometheusTime(this.range.to, true);
       url = '/api/v1/series?match[]=' + encodeURIComponent(metric) + '&start=' + start + '&end=' + end;
 
       return this.datasource.metadataRequest(url).then(function(result) {
-        var _labels = _.map(result.data.data, function(metric) {
+        const _labels = _.map(result.data.data, function(metric) {
           return metric[label] || '';
         }).filter(function(label) {
           return label !== '';
@@ -74,12 +74,12 @@ export default class PrometheusMetricFindQuery {
   }
 
   metricNameQuery(metricFilterPattern) {
-    var url = '/api/v1/label/__name__/values';
+    const url = '/api/v1/label/__name__/values';
 
     return this.datasource.metadataRequest(url).then(function(result) {
       return _.chain(result.data.data)
         .filter(function(metricName) {
-          var r = new RegExp(metricFilterPattern);
+          const r = new RegExp(metricFilterPattern);
           return r.test(metricName);
         })
         .map(function(matchedMetricName) {
@@ -93,7 +93,7 @@ export default class PrometheusMetricFindQuery {
   }
 
   queryResultQuery(query) {
-    var end = this.datasource.getPrometheusTime(this.range.to, true);
+    const end = this.datasource.getPrometheusTime(this.range.to, true);
     return this.datasource.performInstantQuery({ expr: query }, end).then(function(result) {
       return _.map(result.data.data.result, function(metricData) {
         var text = metricData.metric.__name__ || '';
@@ -115,11 +115,11 @@ export default class PrometheusMetricFindQuery {
   }
 
   metricNameAndLabelsQuery(query) {
-    var start = this.datasource.getPrometheusTime(this.range.from, false);
-    var end = this.datasource.getPrometheusTime(this.range.to, true);
-    var url = '/api/v1/series?match[]=' + encodeURIComponent(query) + '&start=' + start + '&end=' + end;
+    const start = this.datasource.getPrometheusTime(this.range.from, false);
+    const end = this.datasource.getPrometheusTime(this.range.to, true);
+    const url = '/api/v1/series?match[]=' + encodeURIComponent(query) + '&start=' + start + '&end=' + end;
 
-    var self = this;
+    const self = this;
     return this.datasource.metadataRequest(url).then(function(result) {
       return _.map(result.data.data, metric => {
         return {

public/app/plugins/datasource/prometheus/query_ctrl.ts

@@ -21,7 +21,7 @@ class PrometheusQueryCtrl extends QueryCtrl {
   constructor($scope, $injector, private templateSrv) {
     super($scope, $injector);
 
-    var target = this.target;
+    const target = this.target;
     target.expr = target.expr || '';
     target.intervalFactor = target.intervalFactor || 1;
     target.format = target.format || this.getDefaultFormat();
@@ -65,14 +65,14 @@ class PrometheusQueryCtrl extends QueryCtrl {
   }
 
   updateLink() {
-    var range = this.panelCtrl.range;
+    const range = this.panelCtrl.range;
     if (!range) {
       return;
     }
 
-    var rangeDiff = Math.ceil((range.to.valueOf() - range.from.valueOf()) / 1000);
-    var endTime = range.to.utc().format('YYYY-MM-DD HH:mm');
-    var expr = {
+    const rangeDiff = Math.ceil((range.to.valueOf() - range.from.valueOf()) / 1000);
+    const endTime = range.to.utc().format('YYYY-MM-DD HH:mm');
+    const expr = {
       'g0.expr': this.templateSrv.replace(
         this.target.expr,
         this.panelCtrl.panel.scopedVars,
@@ -84,7 +84,7 @@ class PrometheusQueryCtrl extends QueryCtrl {
       'g0.stacked': this.panelCtrl.panel.stack ? 1 : 0,
       'g0.tab': 0,
     };
-    var args = _.map(expr, (v, k) => {
+    const args = _.map(expr, (v, k) => {
       return k + '=' + encodeURIComponent(v);
     }).join('&');
     this.linkToPrometheus = this.datasource.directUrl + '/graph?' + args;

public/app/plugins/datasource/prometheus/result_transformer.ts

@@ -32,8 +32,8 @@ export class ResultTransformer {
   }
 
   transformMetricData(metricData, options, start, end) {
-    let dps = [],
-      metricLabel = null;
+    const dps = [];
+    let metricLabel = null;
 
     metricLabel = this.createMetricLabel(metricData.metric, options);
 
@@ -72,9 +72,9 @@ export class ResultTransformer {
   }
 
   transformMetricDataToTable(md, resultCount: number, refId: string) {
-    var table = new TableModel();
+    const table = new TableModel();
     var i, j;
-    var metricLabels = {};
+    const metricLabels = {};
 
     if (md.length === 0) {
       return table;
@@ -82,7 +82,7 @@ export class ResultTransformer {
 
     // Collect all labels across all metrics
     _.each(md, function(series) {
-      for (var label in series.metric) {
+      for (const label in series.metric) {
         if (!metricLabels.hasOwnProperty(label)) {
           metricLabels[label] = 1;
         }
@@ -90,7 +90,7 @@ export class ResultTransformer {
     });
 
     // Sort metric labels, create columns for them and record their index
-    var sortedLabels = _.keys(metricLabels).sort();
+    const sortedLabels = _.keys(metricLabels).sort();
     table.columns.push({ text: 'Time', type: 'time' });
     _.each(sortedLabels, function(label, labelIndex) {
       metricLabels[label] = labelIndex + 1;
@@ -106,11 +106,11 @@ export class ResultTransformer {
       }
       if (series.values) {
         for (i = 0; i < series.values.length; i++) {
-          var values = series.values[i];
-          var reordered: any = [values[0] * 1000];
+          const values = series.values[i];
+          const reordered: any = [values[0] * 1000];
           if (series.metric) {
             for (j = 0; j < sortedLabels.length; j++) {
-              var label = sortedLabels[j];
+              const label = sortedLabels[j];
               if (series.metric.hasOwnProperty(label)) {
                 reordered.push(series.metric[label]);
               } else {
@@ -128,8 +128,8 @@ export class ResultTransformer {
   }
 
   transformInstantMetricData(md, options) {
-    var dps = [],
-      metricLabel = null;
+    const dps = [];
+    let metricLabel = null;
     metricLabel = this.createMetricLabel(md.metric, options);
     dps.push([parseFloat(md.value[1]), md.value[0] * 1000]);
     return { target: metricLabel, datapoints: dps, labels: md.metric };
@@ -149,7 +149,7 @@ export class ResultTransformer {
   }
 
   renderTemplate(aliasPattern, aliasData) {
-    var aliasRegex = /\{\{\s*(.+?)\s*\}\}/g;
+    const aliasRegex = /\{\{\s*(.+?)\s*\}\}/g;
     return aliasPattern.replace(aliasRegex, function(match, g1) {
       if (aliasData[g1]) {
         return aliasData[g1];
@@ -159,9 +159,9 @@ export class ResultTransformer {
   }
 
   getOriginalMetricName(labelData) {
-    var metricName = labelData.__name__ || '';
+    const metricName = labelData.__name__ || '';
     delete labelData.__name__;
-    var labelPart = _.map(_.toPairs(labelData), function(label) {
+    const labelPart = _.map(_.toPairs(labelData), function(label) {
       return label[0] + '="' + label[1] + '"';
     }).join(',');
     return metricName + '{' + labelPart + '}';

public/app/plugins/datasource/testdata/datasource.ts

@@ -9,7 +9,7 @@ class TestDataDatasource {
   }
 
   query(options) {
-    var queries = _.filter(options.targets, item => {
+    const queries = _.filter(options.targets, item => {
       return item.hide !== true;
     }).map(item => {
       return {
@@ -35,7 +35,7 @@ class TestDataDatasource {
         queries: queries,
       })
       .then(res => {
-        var data = [];
+        const data = [];
 
         if (res.results) {
           _.forEach(res.results, queryRes => {

public/app/plugins/panel/alertlist/module.ts

@@ -54,7 +54,7 @@ class AlertListPanel extends PanelCtrl {
       });
     }
 
-    var result = _.sortBy(alerts, a => {
+    const result = _.sortBy(alerts, a => {
       return a.name.toLowerCase();
     });
     if (this.panel.sortOrder === 2) {
@@ -65,7 +65,7 @@ class AlertListPanel extends PanelCtrl {
   }
 
   updateStateFilter() {
-    var result = [];
+    const result = [];
 
     for (const key in this.stateFilter) {
       if (this.stateFilter[key]) {
@@ -99,7 +99,7 @@ class AlertListPanel extends PanelCtrl {
   }
 
   getStateChanges() {
-    var params: any = {
+    const params: any = {
       limit: this.panel.limit,
       type: 'alert',
       newState: this.panel.stateFilter,
@@ -127,7 +127,7 @@ class AlertListPanel extends PanelCtrl {
   }
 
   getCurrentAlertState() {
-    var params: any = {
+    const params: any = {
       state: this.panel.stateFilter,
     };
 

public/app/plugins/panel/dashlist/module.ts

@@ -66,7 +66,7 @@ class DashListCtrl extends PanelCtrl {
   }
 
   onRefresh() {
-    var promises = [];
+    const promises = [];
 
     promises.push(this.getRecentDashboards());
     promises.push(this.getStarred());
@@ -81,7 +81,7 @@ class DashListCtrl extends PanelCtrl {
       return Promise.resolve();
     }
 
-    var params = {
+    const params = {
       limit: this.panel.limit,
       query: this.panel.query,
       tag: this.panel.tags,
@@ -100,7 +100,7 @@ class DashListCtrl extends PanelCtrl {
       return Promise.resolve();
     }
 
-    var params = { limit: this.panel.limit, starred: 'true' };
+    const params = { limit: this.panel.limit, starred: 'true' };
     return this.backendSrv.search(params).then(result => {
       this.groups[0].list = result;
     });
@@ -123,7 +123,7 @@ class DashListCtrl extends PanelCtrl {
       return Promise.resolve();
     }
 
-    var dashIds = _.take(impressionSrv.getDashboardOpened(), this.panel.limit);
+    const dashIds = _.take(impressionSrv.getDashboardOpened(), this.panel.limit);
     return this.backendSrv.search({ dashboardIds: dashIds, limit: this.panel.limit }).then(result => {
       this.groups[1].list = dashIds
         .map(orderId => {

public/app/plugins/panel/gettingstarted/module.ts

@@ -88,7 +88,7 @@ class GettingStartedPanelCtrl extends PanelCtrl {
     }
 
     this.stepIndex += 1;
-    var currentStep = this.steps[this.stepIndex];
+    const currentStep = this.steps[this.stepIndex];
     return currentStep.check().then(passed => {
       if (passed) {
         currentStep.cssClass = 'completed';

public/app/plugins/panel/graph/align_yaxes.ts

@@ -10,15 +10,15 @@ export function alignYLevel(yAxes, level) {
     return;
   }
 
-  var [yLeft, yRight] = yAxes;
+  const [yLeft, yRight] = yAxes;
   moveLevelToZero(yLeft, yRight, level);
 
   expandStuckValues(yLeft, yRight);
 
   // one of graphs on zero
-  var zero = yLeft.min === 0 || yRight.min === 0 || yLeft.max === 0 || yRight.max === 0;
+  const zero = yLeft.min === 0 || yRight.min === 0 || yLeft.max === 0 || yRight.max === 0;
 
-  var oneSide = checkOneSide(yLeft, yRight);
+  const oneSide = checkOneSide(yLeft, yRight);
 
   if (zero && oneSide) {
     yLeft.min = yLeft.max > 0 ? 0 : yLeft.min;
@@ -35,7 +35,7 @@ export function alignYLevel(yAxes, level) {
         yRight.min = -yRight.max;
       }
     } else {
-      var rate = getRate(yLeft, yRight);
+      const rate = getRate(yLeft, yRight);
 
       if (oneSide) {
         // all graphs above the Y level
@@ -67,7 +67,7 @@ export function alignYLevel(yAxes, level) {
 
 function expandStuckValues(yLeft, yRight) {
   // wide Y min and max using increased wideFactor
-  var wideFactor = 0.25;
+  const wideFactor = 0.25;
   if (yLeft.max === yLeft.min) {
     yLeft.min -= wideFactor;
     yLeft.max += wideFactor;
@@ -126,14 +126,14 @@ function getRate(yLeft, yRight) {
     rateRight = yRight.max ? yLeft.max / yRight.max : 0;
   } else {
     if (checkOneSide(yLeft, yRight)) {
-      var absLeftMin = Math.abs(yLeft.min);
-      var absLeftMax = Math.abs(yLeft.max);
-      var absRightMin = Math.abs(yRight.min);
-      var absRightMax = Math.abs(yRight.max);
-      var upLeft = _.max([absLeftMin, absLeftMax]);
-      var downLeft = _.min([absLeftMin, absLeftMax]);
-      var upRight = _.max([absRightMin, absRightMax]);
-      var downRight = _.min([absRightMin, absRightMax]);
+      const absLeftMin = Math.abs(yLeft.min);
+      const absLeftMax = Math.abs(yLeft.max);
+      const absRightMin = Math.abs(yRight.min);
+      const absRightMax = Math.abs(yRight.max);
+      const upLeft = _.max([absLeftMin, absLeftMax]);
+      const downLeft = _.min([absLeftMin, absLeftMax]);
+      const upRight = _.max([absRightMin, absRightMax]);
+      const downRight = _.min([absRightMin, absRightMax]);
 
       rateLeft = downLeft ? upLeft / downLeft : upLeft;
       rateRight = downRight ? upRight / downRight : upRight;