verify using this

app/assets/javascripts/users_select.js

@@ -27,9 +27,10 @@ function UsersSelect(currentUser, els, options = {}) {
   }
 
   const { handleClick } = options;
+  const userSelect = this;
 
   $els.each( (i, dropdown) => {
-        const _this = this;
+    const userSelect = this;
     const options = {};
     const $dropdown = $(dropdown);
     options.projectId = $dropdown.data('projectId');
@@ -74,7 +75,7 @@ function UsersSelect(currentUser, els, options = {}) {
 
       // Save current selected user to the DOM
       const currentUserInfo = $dropdown.data('currentUserInfo') || {};
-          const currentUser = _this.currentUser || {};
+      const currentUser = userSelect.currentUser || {};
       const fieldName = $dropdown.data('fieldName');
       const userName = currentUserInfo.name;
       const userId = currentUserInfo.id || currentUser.id;
@@ -180,7 +181,7 @@ function UsersSelect(currentUser, els, options = {}) {
 
     $block.on('click', '.js-assign-yourself', e => {
       e.preventDefault();
-          return assignTo(_this.currentUser.id);
+      return assignTo(userSelect.currentUser.id);
     });
 
     assignTo = function(selected) {
@@ -228,7 +229,7 @@ function UsersSelect(currentUser, els, options = {}) {
     return $dropdown.glDropdown({
       showMenuAbove,
       data(term, callback) {
-            return _this.users(term, options, users => {
+        return userSelect.users(term, options, users => {
           // GitLabDropdownFilter returns this.instance
           // GitLabDropdownRemote returns this.options.instance
           const glDropdown = this.instance || this.options.instance;
@@ -550,7 +551,7 @@ function UsersSelect(currentUser, els, options = {}) {
           img = `<img src='${avatar}' class='avatar avatar-inline m-0' width='32' />`;
         }
 
-            return _this.renderRow(options.issuableType, user, selected, username, img);
+        return userSelect.renderRow(options.issuableType, user, selected, username, img);
       },
     });
   });
@@ -558,7 +559,6 @@ function UsersSelect(currentUser, els, options = {}) {
     .then(() => {
       $('.ajax-users-select').each(
         (i, select) => {
-            const _this = this;
           const options = {};
           options.skipLdap = $(select).hasClass('skip_ldap');
           options.projectId = $(select).data('projectId');
@@ -575,7 +575,7 @@ function UsersSelect(currentUser, els, options = {}) {
             multiple: $(select).hasClass('multiselect'),
             minimumInputLength: 0,
             query(query) {
-                return _this.users(query.term, options, users => {
+              return userSelect.users(query.term, options, users => {
                 let name;
                 const data = {
                   results: users,
@@ -632,15 +632,15 @@ function UsersSelect(currentUser, els, options = {}) {
             },
             initSelection() {
               const args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
-                return _this.initSelection.apply(_this, args);
+              return userSelect.initSelection.apply(userSelect, args);
             },
             formatResult() {
               const args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
-                return _this.formatResult.apply(_this, args);
+              return userSelect.formatResult.apply(userSelect, args);
             },
             formatSelection() {
               const args = 1 <= arguments.length ? [].slice.call(arguments, 0) : [];
-                return _this.formatSelection.apply(_this, args);
+              return userSelect.formatSelection.apply(userSelect, args);
             },
             dropdownCssClass: 'ajax-users-dropdown',
             // we do not want to escape markup since we are displaying html in results