diff --git a/extras/docs/themes/sassdoc/assets/js/versioning/tag-versions.req.js b/extras/docs/themes/sassdoc/assets/js/versioning/tag-versions.req.js
index 4c1956b8485..c795f5e649a 100644
--- a/extras/docs/themes/sassdoc/assets/js/versioning/tag-versions.req.js
+++ b/extras/docs/themes/sassdoc/assets/js/versioning/tag-versions.req.js
@@ -9,26 +9,26 @@
         xhrFields: {
             withCredentials: false
         }
-    }).done((data) =>  {
+    }).done(function (data) {
         let folders = data.folders;
         const select = $('#versions');
         folders = folders.reverse();
 
-        folders.forEach(f => {
+        folders.forEach(function (f) {
             select.append($('<option>', {
-                value: `${baseUrl}/products/ignite-ui-angular/docs/${f}/sass`,
+                value: baseUrl + "/products/ignite-ui-angular/docs/" + f + "/sass",
                 text: f
             }));
         });
 
-        select.val(`${baseUrl}/products/ignite-ui-angular/docs/${folders[0]}/sass`);
+        select.val(baseUrl + "/products/ignite-ui-angular/docs/" + folders[0] + "/sass");
 
         if (sessionStorage.sassOption) {
             select.val(sessionStorage.sassOption);
         }
     });
 
-    $('#versions').on('change', (...rest) => {
+    $('#versions').on('change', function () {
         const val = $('#versions').val();
         sessionStorage.sassOption = val;
         window.location.assign(val);
diff --git a/extras/docs/themes/typedoc/src/assets/js/src/versioning/tag-versions.req.js b/extras/docs/themes/typedoc/src/assets/js/src/versioning/tag-versions.req.js
index ac8e2248352..786d74e9e04 100644
--- a/extras/docs/themes/typedoc/src/assets/js/src/versioning/tag-versions.req.js
+++ b/extras/docs/themes/typedoc/src/assets/js/src/versioning/tag-versions.req.js
@@ -9,26 +9,26 @@
         xhrFields: {
             withCredentials: false
         }
-    }).done((data) =>  {
+    }).done(function (data) {
         let folders = data.folders;
         const select = $('#versions')
         folders = folders.reverse();
 
-        folders.forEach(f => {
+        folders.forEach(function (f) {
             select.append($('<option>', {
-                value: `${baseUrl}/products/ignite-ui-angular/docs/${f}/typescript`,
+                value: baseUrl + "/products/ignite-ui-angular/docs/" + f + "/typescript",
                 text: f
             }));
         });
 
-        select.val(`${baseUrl}/products/ignite-ui-angular/docs/${folders[0]}/typescript`);
+        select.val(baseUrl + "/products/ignite-ui-angular/docs/" + folders[0] + "/typescript");
 
         if (sessionStorage.typedocOption) {
             select.val(sessionStorage.typedocOption);
         }
     });
 
-    $('#versions').on('change', (...rest) => {
+    $('#versions').on('change', function () {
         const val = $('#versions').val();
         sessionStorage.typedocOption = val;
         window.location.assign(val);