tslint: more const fixes (#13035)

public/app/core/config.ts

@@ -31,7 +31,7 @@ export class Settings {
   loginError: any;
 
   constructor(options) {
-    var defaults = {
+    const defaults = {
       datasources: {},
       window_title_prefix: 'Grafana - ',
       panels: {},
@@ -51,8 +51,8 @@ export class Settings {
   }
 }
 
-var bootData = (<any>window).grafanaBootData || { settings: {} };
-var options = bootData.settings;
+const bootData = (<any>window).grafanaBootData || { settings: {} };
+const options = bootData.settings;
 options.bootData = bootData;
 
 const config = new Settings(options);

public/app/features/admin/admin_edit_user_ctrl.ts

@@ -29,14 +29,14 @@ export class AdminEditUserCtrl {
         return;
       }
 
-      var payload = { password: $scope.password };
+      const payload = { password: $scope.password };
       backendSrv.put('/api/admin/users/' + $scope.user_id + '/password', payload).then(function() {
         $location.path('/admin/users');
       });
     };
 
     $scope.updatePermissions = function() {
-      var payload = $scope.permissions;
+      const payload = $scope.permissions;
 
       backendSrv.put('/api/admin/users/' + $scope.user_id + '/permissions', payload).then(function() {
         $location.path('/admin/users');
@@ -99,7 +99,7 @@ export class AdminEditUserCtrl {
         return;
       }
 
-      var orgInfo = _.find($scope.orgsSearchCache, {
+      const orgInfo = _.find($scope.orgsSearchCache, {
         name: $scope.newOrg.name,
       });
       if (!orgInfo) {

public/app/features/alerting/notification_edit_ctrl.ts

@@ -99,7 +99,7 @@ export class AlertNotificationEditCtrl {
       return;
     }
 
-    var payload = {
+    const payload = {
       name: this.model.name,
       type: this.model.type,
       settings: this.model.settings,

public/app/features/annotations/specs/annotations_srv.test.ts

@@ -6,12 +6,8 @@ describe('AnnotationsSrv', function() {
   const $rootScope = {
     onAppEvent: jest.fn(),
   };
-  let $q;
-  let datasourceSrv;
-  let backendSrv;
-  let timeSrv;
 
-  const annotationsSrv = new AnnotationsSrv($rootScope, $q, datasourceSrv, backendSrv, timeSrv);
+  const annotationsSrv = new AnnotationsSrv($rootScope, null, null, null, null);
 
   describe('When translating the query result', () => {
     const annotationSource = {

public/app/features/dashboard/ad_hoc_filters.ts

@@ -55,8 +55,8 @@ export class AdHocFiltersCtrl {
     }
 
     return this.datasourceSrv.get(this.variable.datasource).then(ds => {
-      var options: any = {};
-      var promise = null;
+      const options: any = {};
+      let promise = null;
 
       if (segment.type !== 'value') {
         promise = ds.getTagKeys();
@@ -113,9 +113,9 @@ export class AdHocFiltersCtrl {
   }
 
   updateVariableModel() {
-    var filters = [];
-    var filterIndex = -1;
-    var hasFakes = false;
+    const filters = [];
+    let filterIndex = -1;
+    let hasFakes = false;
 
     this.segments.forEach(segment => {
       if (segment.type === 'value' && segment.fake) {
@@ -153,7 +153,7 @@ export class AdHocFiltersCtrl {
   }
 }
 
-var template = `
+const template = `
 <div class="gf-form-inline">
   <div class="gf-form" ng-repeat="segment in ctrl.segments">
     <metric-segment segment="segment" get-options="ctrl.getOptions(segment, $index)"

public/app/features/dashboard/change_tracker.ts

@@ -87,7 +87,7 @@ export class ChangeTracker {
       return true;
     }
 
-    var meta = this.current.meta;
+    const meta = this.current.meta;
     return !meta.canSave || meta.fromScript || meta.fromFile;
   }
 
@@ -141,15 +141,15 @@ export class ChangeTracker {
     const current = this.cleanDashboardFromIgnoredChanges(this.current.getSaveModelClone());
     const original = this.cleanDashboardFromIgnoredChanges(this.original);
 
-    var currentTimepicker = _.find(current.nav, { type: 'timepicker' });
-    var originalTimepicker = _.find(original.nav, { type: 'timepicker' });
+    const currentTimepicker = _.find(current.nav, { type: 'timepicker' });
+    const originalTimepicker = _.find(original.nav, { type: 'timepicker' });
 
     if (currentTimepicker && originalTimepicker) {
       currentTimepicker.now = originalTimepicker.now;
     }
 
-    var currentJson = angular.toJson(current, true);
-    var originalJson = angular.toJson(original, true);
+    const currentJson = angular.toJson(current, true);
+    const originalJson = angular.toJson(original, true);
 
     return currentJson !== originalJson;
   }
@@ -167,8 +167,8 @@ export class ChangeTracker {
   }
 
   saveChanges() {
-    var self = this;
-    var cancel = this.$rootScope.$on('dashboard-saved', () => {
+    const self = this;
+    const cancel = this.$rootScope.$on('dashboard-saved', () => {
       cancel();
       this.$timeout(() => {
         self.gotoNext();
@@ -179,8 +179,8 @@ export class ChangeTracker {
   }
 
   gotoNext() {
-    var baseLen = this.$location.absUrl().length - this.$location.url().length;
-    var nextUrl = this.next.substring(baseLen);
+    const baseLen = this.$location.absUrl().length - this.$location.url().length;
+    const nextUrl = this.next.substring(baseLen);
     this.$location.url(nextUrl);
   }
 }

public/app/features/dashboard/dashboard_import_ctrl.ts

@@ -52,7 +52,7 @@ export class DashboardImportCtrl {
 
     if (this.dash.__inputs) {
       for (const input of this.dash.__inputs) {
-        var inputModel = {
+        const inputModel = {
           name: input.name,
           label: input.label,
           info: input.description,
@@ -78,7 +78,7 @@ export class DashboardImportCtrl {
   }
 
   setDatasourceOptions(input, inputModel) {
-    var sources = _.filter(config.datasources, val => {
+    const sources = _.filter(config.datasources, val => {
       return val.type === input.pluginId;
     });
 
@@ -162,7 +162,7 @@ export class DashboardImportCtrl {
   }
 
   saveDashboard() {
-    var inputs = this.inputs.map(input => {
+    const inputs = this.inputs.map(input => {
       return {
         name: input.name,
         type: input.type,
@@ -186,7 +186,7 @@ export class DashboardImportCtrl {
   loadJsonText() {
     try {
       this.parseError = '';
-      var dash = JSON.parse(this.jsonText);
+      const dash = JSON.parse(this.jsonText);
       this.onUpload(dash);
     } catch (err) {
       console.log(err);
@@ -198,8 +198,8 @@ export class DashboardImportCtrl {
   checkGnetDashboard() {
     this.gnetError = '';
 
-    var match = /(^\d+$)|dashboards\/(\d+)/.exec(this.gnetUrl);
-    var dashboardId;
+    const match = /(^\d+$)|dashboards\/(\d+)/.exec(this.gnetUrl);
+    let dashboardId;
 
     if (match && match[1]) {
       dashboardId = match[1];

public/app/features/dashboard/dashgrid/AddPanelPanel.tsx

@@ -97,7 +97,7 @@ export class AddPanelPanel extends React.Component<AddPanelPanelProps, AddPanelP
     const dashboard = panelContainer.getDashboard();
     const { gridPos } = this.props.panel;
 
-    var newPanel: any = {
+    const newPanel: any = {
       type: panelPluginInfo.id,
       title: 'Panel Title',
       gridPos: { x: gridPos.x, y: gridPos.y, w: gridPos.w, h: gridPos.h },

public/app/features/dashboard/export/export_modal.ts

@@ -21,14 +21,14 @@ export class DashExportCtrl {
   }
 
   save() {
-    var blob = new Blob([angular.toJson(this.dash, true)], {
+    const blob = new Blob([angular.toJson(this.dash, true)], {
       type: 'application/json;charset=utf-8',
     });
     saveAs(blob, this.dash.title + '-' + new Date().getTime() + '.json');
   }
 
   saveJson() {
-    var clone = this.dash;
+    const clone = this.dash;
     const editScope = this.$rootScope.$new();
     editScope.object = clone;
     editScope.enableCopy = true;

public/app/features/dashboard/export/exporter.ts

@@ -12,23 +12,23 @@ export class DashboardExporter {
     // this is pretty hacky and needs to be changed
     dashboard.cleanUpRepeats();
 
-    var saveModel = dashboard.getSaveModelClone();
+    const saveModel = dashboard.getSaveModelClone();
     saveModel.id = null;
 
     // undo repeat cleanup
     dashboard.processRepeats();
 
-    var inputs = [];
-    var requires = {};
-    var datasources = {};
-    var promises = [];
-    var variableLookup: any = {};
+    const inputs = [];
+    const requires = {};
+    const datasources = {};
+    const promises = [];
+    const variableLookup: any = {};
 
     for (const variable of saveModel.templating.list) {
       variableLookup[variable.name] = variable;
     }
 
-    var templateizeDatasourceUsage = obj => {
+    const templateizeDatasourceUsage = obj => {
       // ignore data source properties that contain a variable
       if (obj.datasource && obj.datasource.indexOf('$') === 0) {
         if (variableLookup[obj.datasource.substring(1)]) {
@@ -42,7 +42,7 @@ export class DashboardExporter {
             return;
           }
 
-          var refName = 'DS_' + ds.name.replace(' ', '_').toUpperCase();
+          const refName = 'DS_' + ds.name.replace(' ', '_').toUpperCase();
           datasources[refName] = {
             name: refName,
             label: ds.name,
@@ -76,7 +76,7 @@ export class DashboardExporter {
         }
       }
 
-      var panelDef = config.panels[panel.type];
+      const panelDef = config.panels[panel.type];
       if (panelDef) {
         requires['panel' + panelDef.id] = {
           type: 'panel',
@@ -131,7 +131,7 @@ export class DashboardExporter {
         // templatize constants
         for (const variable of saveModel.templating.list) {
           if (variable.type === 'constant') {
-            var refName = 'VAR_' + variable.name.replace(' ', '_').toUpperCase();
+            const refName = 'VAR_' + variable.name.replace(' ', '_').toUpperCase();
             inputs.push({
               name: refName,
               type: 'constant',
@@ -149,7 +149,7 @@ export class DashboardExporter {
         }
 
         // make inputs and requires a top thing
-        var newObj = {};
+        const newObj = {};
         newObj['__inputs'] = inputs;
         newObj['__requires'] = _.sortBy(requires, ['id']);
 

public/app/features/dashboard/repeat_option/repeat_option.ts

@@ -1,6 +1,6 @@
 import { coreModule } from 'app/core/core';
 
-var template = `
+const template = `
 <div class="gf-form-select-wrapper max-width-18">
   <select class="gf-form-input" ng-model="panel.repeat" ng-options="f.value as f.text for f in variables" ng-change="optionChanged()">
   <option value=""></option>

public/app/features/dashboard/settings/settings.ts

@@ -156,7 +156,7 @@ export class SettingsCtrl {
   }
 
   hideSettings() {
-    var urlParams = this.$location.search();
+    const urlParams = this.$location.search();
     delete urlParams.editview;
     setTimeout(() => {
       this.$rootScope.$apply(() => {

public/app/features/dashboard/specs/change_tracker.test.ts

@@ -12,7 +12,7 @@ jest.mock('app/core/services/context_srv', () => ({
 describe('ChangeTracker', () => {
   let rootScope;
   let location;
-  let timeout;
+  const timeout = () => {};
   let tracker: ChangeTracker;
   let dash;
   let scope;

public/app/features/dashboard/specs/dashboard_import_ctrl.test.ts

@@ -2,7 +2,7 @@ import { DashboardImportCtrl } from '../dashboard_import_ctrl';
 import config from '../../../core/config';
 
 describe('DashboardImportCtrl', function() {
-  var ctx: any = {};
+  const ctx: any = {};
 
   let navModelSrv;
   let backendSrv;

public/app/features/dashboard/specs/dashboard_migration.test.ts

@@ -8,10 +8,10 @@ jest.mock('app/core/services/context_srv', () => ({}));
 
 describe('DashboardModel', function() {
   describe('when creating dashboard with old schema', function() {
-    var model;
-    var graph;
-    var singlestat;
-    var table;
+    let model;
+    let graph;
+    let singlestat;
+    let table;
 
     beforeEach(function() {
       model = new DashboardModel({
@@ -384,7 +384,8 @@ describe('DashboardModel', function() {
 
 function createRow(options, panelDescriptions: any[]) {
   const PANEL_HEIGHT_STEP = GRID_CELL_HEIGHT + GRID_CELL_VMARGIN;
-  let { collapse, height, showTitle, title, repeat, repeatIteration } = options;
+  const { collapse, showTitle, title, repeat, repeatIteration } = options;
+  let { height } = options;
   height = height * PANEL_HEIGHT_STEP;
   const panels = [];
   _.each(panelDescriptions, panelDesc => {

public/app/features/dashboard/time_srv.ts

@@ -70,7 +70,7 @@ export class TimeSrv {
     }
 
     if (!isNaN(value)) {
-      var epoch = parseInt(value);
+      const epoch = parseInt(value);
       return moment.utc(epoch);
     }
 
@@ -78,7 +78,7 @@ export class TimeSrv {
   }
 
   private initTimeFromUrl() {
-    var params = this.$location.search();
+    const params = this.$location.search();
     if (params.from) {
       this.time.from = this.parseUrlParam(params.from) || this.time.from;
     }
@@ -91,8 +91,8 @@ export class TimeSrv {
   }
 
   private routeUpdated() {
-    var params = this.$location.search();
-    var urlRange = this.timeRangeForUrl();
+    const params = this.$location.search();
+    const urlRange = this.timeRangeForUrl();
     // check if url has time range
     if (params.from && params.to) {
       // is it different from what our current time range?
@@ -114,7 +114,7 @@ export class TimeSrv {
     this.dashboard.refresh = interval;
     this.cancelNextRefresh();
     if (interval) {
-      var intervalMs = kbn.interval_to_ms(interval);
+      const intervalMs = kbn.interval_to_ms(interval);
 
       this.refreshTimer = this.timer.register(
         this.$timeout(() => {
@@ -125,7 +125,7 @@ export class TimeSrv {
     }
 
     // update url
-    var params = this.$location.search();
+    const params = this.$location.search();
     if (interval) {
       params.refresh = interval;
       this.$location.search(params);
@@ -171,8 +171,8 @@ export class TimeSrv {
 
     // update url
     if (fromRouteUpdate !== true) {
-      var urlRange = this.timeRangeForUrl();
-      var urlParams = this.$location.search();
+      const urlRange = this.timeRangeForUrl();
+      const urlParams = this.$location.search();
       urlParams.from = urlRange.from;
       urlParams.to = urlRange.to;
       this.$location.search(urlParams);
@@ -183,7 +183,7 @@ export class TimeSrv {
   }
 
   timeRangeForUrl() {
-    var range = this.timeRange().raw;
+    const range = this.timeRange().raw;
 
     if (moment.isMoment(range.from)) {
       range.from = range.from.valueOf().toString();
@@ -197,12 +197,12 @@ export class TimeSrv {
 
   timeRange() {
     // make copies if they are moment  (do not want to return out internal moment, because they are mutable!)
-    var raw = {
+    const raw = {
       from: moment.isMoment(this.time.from) ? moment(this.time.from) : this.time.from,
       to: moment.isMoment(this.time.to) ? moment(this.time.to) : this.time.to,
     };
 
-    var timezone = this.dashboard && this.dashboard.getTimezone();
+    const timezone = this.dashboard && this.dashboard.getTimezone();
 
     return {
       from: dateMath.parse(raw.from, false, timezone),
@@ -212,16 +212,16 @@ export class TimeSrv {
   }
 
   zoomOut(e, factor) {
-    var range = this.timeRange();
+    const range = this.timeRange();
 
-    var timespan = range.to.valueOf() - range.from.valueOf();
-    var center = range.to.valueOf() - timespan / 2;
+    const timespan = range.to.valueOf() - range.from.valueOf();
+    const center = range.to.valueOf() - timespan / 2;
 
-    var to = center + timespan * factor / 2;
-    var from = center - timespan * factor / 2;
+    let to = center + timespan * factor / 2;
+    let from = center - timespan * factor / 2;
 
     if (to > Date.now() && range.to <= Date.now()) {
-      var offset = to - Date.now();
+      const offset = to - Date.now();
       from = from - offset;
       to = Date.now();
     }

public/app/features/dashboard/timepicker/input_date.ts

@@ -6,9 +6,9 @@ export function inputDateDirective() {
     restrict: 'A',
     require: 'ngModel',
     link: function($scope, $elem, attrs, ngModel) {
-      var format = 'YYYY-MM-DD HH:mm:ss';
+      const format = 'YYYY-MM-DD HH:mm:ss';
 
-      var fromUser = function(text) {
+      const fromUser = function(text) {
         if (text.indexOf('now') !== -1) {
           if (!dateMath.isValid(text)) {
             ngModel.$setValidity('error', false);
@@ -34,7 +34,7 @@ export function inputDateDirective() {
         return parsed;
       };
 
-      var toUser = function(currentValue) {
+      const toUser = function(currentValue) {
         if (moment.isMoment(currentValue)) {
           return currentValue.format(format);
         } else {

public/app/features/dashboard/timepicker/timepicker.ts

@@ -43,8 +43,8 @@ export class TimePickerCtrl {
   }
 
   onRefresh() {
-    var time = angular.copy(this.timeSrv.timeRange());
-    var timeRaw = angular.copy(time.raw);
+    const time = angular.copy(this.timeSrv.timeRange());
+    const timeRaw = angular.copy(time.raw);
 
     if (!this.dashboard.isTimezoneUtc()) {
       time.from.local();
@@ -72,9 +72,9 @@ export class TimePickerCtrl {
   }
 
   move(direction) {
-    var range = this.timeSrv.timeRange();
+    const range = this.timeSrv.timeRange();
 
-    var timespan = (range.to.valueOf() - range.from.valueOf()) / 2;
+    const timespan = (range.to.valueOf() - range.from.valueOf()) / 2;
     var to, from;
     if (direction === -1) {
       to = range.to.valueOf() - timespan;
@@ -142,7 +142,7 @@ export class TimePickerCtrl {
   }
 
   setRelativeFilter(timespan) {
-    var range = { from: timespan.from, to: timespan.to };
+    const range = { from: timespan.from, to: timespan.to };
 
     if (this.panel.nowDelay && range.to === 'now') {
       range.to = 'now-' + this.panel.nowDelay;

public/app/features/dashboard/upload.ts

@@ -1,6 +1,6 @@
 import coreModule from 'app/core/core_module';
 
-var template = `
+const template = `
 <input type="file" id="dashupload" name="dashupload" class="hide"/>
 <label class="btn btn-success" for="dashupload">
   <i class="fa fa-upload"></i>
@@ -18,8 +18,8 @@ function uploadDashboardDirective(timer, alertSrv, $location) {
     },
     link: function(scope) {
       function file_selected(evt) {
-        var files = evt.target.files; // FileList object
-        var readerOnload = function() {
+        const files = evt.target.files; // FileList object
+        const readerOnload = function() {
           return function(e) {
             var dash;
             try {
@@ -37,13 +37,13 @@ function uploadDashboardDirective(timer, alertSrv, $location) {
         };
 
         for (var i = 0, f; (f = files[i]); i++) {
-          var reader = new FileReader();
+          const reader = new FileReader();
           reader.onload = readerOnload();
           reader.readAsText(f);
         }
       }
 
-      var wnd: any = window;
+      const wnd: any = window;
       // Check for the various File API support.
       if (wnd.File && wnd.FileReader && wnd.FileList && wnd.Blob) {
         // Something

public/app/features/org/org_api_keys_ctrl.ts

@@ -24,7 +24,7 @@ export class OrgApiKeysCtrl {
 
     $scope.addToken = function() {
       backendSrv.post('/api/auth/keys', $scope.token).then(function(result) {
-        var modalScope = $scope.$new(true);
+        const modalScope = $scope.$new(true);
         modalScope.key = result.key;
         modalScope.rootPath = window.location.origin + $scope.$root.appSubUrl;
 

public/app/features/org/org_details_ctrl.ts

@@ -20,7 +20,7 @@ export class OrgDetailsCtrl {
       if (!$scope.orgForm.$valid) {
         return;
       }
-      var data = { name: $scope.org.name };
+      const data = { name: $scope.org.name };
       backendSrv.put('/api/org', data).then($scope.getOrgInfo);
     };
 

public/app/features/org/prefs_control.ts

@@ -29,7 +29,7 @@ export class PrefsControlCtrl {
       return;
     }
 
-    var cmd = {
+    const cmd = {
       theme: this.prefs.theme,
       timezone: this.prefs.timezone,
       homeDashboardId: this.prefs.homeDashboardId,
@@ -41,7 +41,7 @@ export class PrefsControlCtrl {
   }
 }
 
-var template = `
+const template = `
 <form name="ctrl.prefsForm" class="section gf-form-group">
   <h3 class="page-heading">Preferences</h3>
 

public/app/features/panel/panel_directive.ts

@@ -3,9 +3,9 @@ import $ from 'jquery';
 import Drop from 'tether-drop';
 import baron from 'baron';
 
-var module = angular.module('grafana.directives');
+const module = angular.module('grafana.directives');
 
-var panelTemplate = `
+const panelTemplate = `
   <div class="panel-container">
     <div class="panel-header" ng-class="{'grid-drag-handle': !ctrl.fullscreen}">
       <span class="panel-info-corner">
@@ -61,19 +61,19 @@ module.directive('grafanaPanel', function($rootScope, $document, $timeout) {
     transclude: true,
     scope: { ctrl: '=' },
     link: function(scope, elem) {
-      var panelContainer = elem.find('.panel-container');
-      var panelContent = elem.find('.panel-content');
-      var cornerInfoElem = elem.find('.panel-info-corner');
-      var ctrl = scope.ctrl;
-      var infoDrop;
-      var panelScrollbar;
+      const panelContainer = elem.find('.panel-container');
+      const panelContent = elem.find('.panel-content');
+      const cornerInfoElem = elem.find('.panel-info-corner');
+      const ctrl = scope.ctrl;
+      let infoDrop;
+      let panelScrollbar;
 
       // the reason for handling these classes this way is for performance
       // limit the watchers on panels etc
-      var transparentLastState = false;
-      var lastHasAlertRule = false;
-      var lastAlertState;
-      var hasAlertRule;
+      let transparentLastState = false;
+      let lastHasAlertRule = false;
+      let lastAlertState;
+      let hasAlertRule;
 
       function mouseEnter() {
         panelContainer.toggleClass('panel-hover-highlight', true);
@@ -174,7 +174,7 @@ module.directive('grafanaPanel', function($rootScope, $document, $timeout) {
       });
 
       function updatePanelCornerInfo() {
-        var cornerMode = ctrl.getInfoMode();
+        const cornerMode = ctrl.getInfoMode();
         cornerInfoElem[0].className = 'panel-info-corner panel-info-corner--' + cornerMode;
 
         if (cornerMode) {

public/app/features/panel/panel_editor_tab.ts

@@ -1,6 +1,6 @@
 import angular from 'angular';
 
-var directiveModule = angular.module('grafana.directives');
+const directiveModule = angular.module('grafana.directives');
 
 /** @ngInject */
 function panelEditorTab(dynamicDirectiveSrv) {
@@ -11,13 +11,13 @@ function panelEditorTab(dynamicDirectiveSrv) {
       index: '=',
     },
     directive: scope => {
-      var pluginId = scope.ctrl.pluginId;
-      var tabIndex = scope.index;
+      const pluginId = scope.ctrl.pluginId;
+      const tabIndex = scope.index;
       // create a wrapper for directiveFn
       // required for metrics tab directive
       // that is the same for many panels but
       // given different names in this function
-      var fn = () => scope.editorTab.directiveFn();
+      const fn = () => scope.editorTab.directiveFn();
 
       return Promise.resolve({
         name: `panel-editor-tab-${pluginId}${tabIndex}`,

public/app/features/panel/panel_header.ts

@@ -1,7 +1,7 @@
 import $ from 'jquery';
 import { coreModule } from 'app/core/core';
 
-var template = `
+const template = `
 <span class="panel-title">
   <span class="icon-gf panel-alert-icon"></span>
   <span class="panel-title-text">{{ctrl.panel.title | interpolateTemplateVars:this}}</span>

public/app/features/panel/query_editor_row.ts

@@ -1,6 +1,6 @@
 import angular from 'angular';
 
-var module = angular.module('grafana.directives');
+const module = angular.module('grafana.directives');
 
 export class QueryRowCtrl {
   collapsedText: string;
@@ -56,7 +56,7 @@ export class QueryRowCtrl {
     try {
       this.collapsedText = this.queryCtrl.getCollapsedText();
     } catch (e) {
-      var err = e.message || e.toString();
+      const err = e.message || e.toString();
       this.collapsedText = 'Error: ' + err;
     }
   }
@@ -78,7 +78,7 @@ export class QueryRowCtrl {
   }
 
   duplicateQuery() {
-    var clone = angular.copy(this.target);
+    const clone = angular.copy(this.target);
     this.panelCtrl.addQuery(clone);
   }
 

public/app/features/panel/query_troubleshooter.ts

@@ -172,7 +172,7 @@ export function queryTroubleshooter() {
     },
     link: function(scope, elem, attrs, ctrl) {
       ctrl.renderJsonExplorer = function(data) {
-        var jsonElem = elem.find('.query-troubleshooter-json');
+        const jsonElem = elem.find('.query-troubleshooter-json');
 
         ctrl.jsonExplorer = new JsonExplorer(data, 3, {
           animateOpen: true,

public/app/features/panel/solo_panel_ctrl.ts

@@ -5,13 +5,13 @@ import appEvents from 'app/core/app_events';
 export class SoloPanelCtrl {
   /** @ngInject */
   constructor($scope, $routeParams, $location, dashboardLoaderSrv, contextSrv, backendSrv) {
-    var panelId;
+    let panelId;
 
     $scope.init = function() {
       contextSrv.sidemenu = false;
       appEvents.emit('toggle-sidemenu-hidden');
 
-      var params = $location.search();
+      const params = $location.search();
       panelId = parseInt(params.panelId);
 
       $scope.onAppEvent('dashboard-initialized', $scope.initPanelScope);

public/app/features/playlist/playlist_edit_ctrl.ts

@@ -22,7 +22,7 @@ export class PlaylistEditCtrl {
     this.isNew = $route.current.params.id;
 
     if ($route.current.params.id) {
-      var playlistId = $route.current.params.id;
+      const playlistId = $route.current.params.id;
 
       backendSrv.get('/api/playlists/' + playlistId).then(result => {
         this.playlist = result;
@@ -69,7 +69,7 @@ export class PlaylistEditCtrl {
   }
 
   addTagPlaylistItem(tag) {
-    var playlistItem: any = {
+    const playlistItem: any = {
       value: tag.term,
       type: 'dashboard_by_tag',
       order: this.playlistItems.length + 1,
@@ -124,8 +124,8 @@ export class PlaylistEditCtrl {
   }
 
   movePlaylistItem(playlistItem, offset) {
-    var currentPosition = this.playlistItems.indexOf(playlistItem);
-    var newPosition = currentPosition + offset;
+    const currentPosition = this.playlistItems.indexOf(playlistItem);
+    const newPosition = currentPosition + offset;
 
     if (newPosition >= 0 && newPosition < this.playlistItems.length) {
       this.playlistItems.splice(currentPosition, 1);

public/app/features/playlist/playlist_search.ts

@@ -19,7 +19,7 @@ export class PlaylistSearchCtrl {
 
   searchDashboards() {
     this.tagsMode = false;
-    var prom: any = {};
+    const prom: any = {};
 
     prom.promise = this.backendSrv.search(this.query).then(result => {
       return {
@@ -50,7 +50,7 @@ export class PlaylistSearchCtrl {
   }
 
   getTags() {
-    var prom: any = {};
+    const prom: any = {};
     prom.promise = this.backendSrv.get('/api/dashboards/tags').then(result => {
       return {
         dashboardResult: [],

public/app/features/playlist/playlist_srv.ts

@@ -16,14 +16,14 @@ class PlaylistSrv {
   next() {
     this.$timeout.cancel(this.cancelPromise);
 
-    var playedAllDashboards = this.index > this.dashboards.length - 1;
+    const playedAllDashboards = this.index > this.dashboards.length - 1;
 
     if (playedAllDashboards) {
       window.location.href = this.getUrlWithKioskMode();
       return;
     }
 
-    var dash = this.dashboards[this.index];
+    const dash = this.dashboards[this.index];
     this.$location.url('dashboard/' + dash.uri);
 
     this.index++;

public/app/features/styleguide/styleguide.ts

@@ -17,7 +17,7 @@ class StyleGuideCtrl {
   switchTheme() {
     this.$routeParams.theme = this.theme === 'dark' ? 'light' : 'dark';
 
-    var cmd = {
+    const cmd = {
       theme: this.$routeParams.theme,
     };