prettier: change to single quoting

public/app/features/dashboard/upload.ts

@@ -1,6 +1,6 @@
 ///<reference path="../../headers/common.d.ts" />
 
-import coreModule from "app/core/core_module";
+import coreModule from 'app/core/core_module';
 
 var template = `
 <input type="file" id="dashupload" name="dashupload" class="hide"/>
@@ -13,10 +13,10 @@ var template = `
 /** @ngInject */
 function uploadDashboardDirective(timer, alertSrv, $location) {
   return {
-    restrict: "E",
+    restrict: 'E',
     template: template,
     scope: {
-      onUpload: "&"
+      onUpload: '&',
     },
     link: function(scope) {
       function file_selected(evt) {
@@ -28,9 +28,9 @@ function uploadDashboardDirective(timer, alertSrv, $location) {
               dash = JSON.parse(e.target.result);
             } catch (err) {
               console.log(err);
-              scope.appEvent("alert-error", [
-                "Import failed",
-                "JSON -> JS Serialization failed: " + err.message
+              scope.appEvent('alert-error', [
+                'Import failed',
+                'JSON -> JS Serialization failed: ' + err.message,
               ]);
               return;
             }
@@ -53,17 +53,17 @@ function uploadDashboardDirective(timer, alertSrv, $location) {
       if (wnd.File && wnd.FileReader && wnd.FileList && wnd.Blob) {
         // Something
         document
-          .getElementById("dashupload")
-          .addEventListener("change", file_selected, false);
+          .getElementById('dashupload')
+          .addEventListener('change', file_selected, false);
       } else {
         alertSrv.set(
-          "Oops",
-          "Sorry, the HTML5 File APIs are not fully supported in this browser.",
-          "error"
+          'Oops',
+          'Sorry, the HTML5 File APIs are not fully supported in this browser.',
+          'error'
         );
       }
-    }
+    },
   };
 }
 
-coreModule.directive("dashUpload", uploadDashboardDirective);
+coreModule.directive('dashUpload', uploadDashboardDirective);