Modified the code to pass the test.

packages/app/src/components/InstallerForm.jsx

@@ -1,8 +1,8 @@
 import React from 'react';
 
 import i18next from 'i18next';
-import PropTypes from 'prop-types';
 import { useTranslation } from 'next-i18next';
+import PropTypes from 'prop-types';
 
 // import { localeMetadatas } from '~/client/util/i18n';
 import { useCsrfToken } from '~/stores/context';
@@ -17,7 +17,7 @@ class InstallerForm extends React.Component {
       isSubmittingDisabled: false,
       selectedLang: {},
     };
-    // this.checkUserName = this.checkUserName.bind(this);
+    this.checkUserName = this.checkUserName.bind(this);
 
     this.submitHandler = this.submitHandler.bind(this);
   }
@@ -30,17 +30,17 @@ class InstallerForm extends React.Component {
   //   this.setState({ selectedLang: meta });
   // }
 
-  // checkUserName(event) {
-  //   const axios = require('axios').create({
-  //     headers: {
-  //       'Content-Type': 'application/json',
-  //       'X-Requested-With': 'XMLHttpRequest',
-  //     },
-  //     responseType: 'json',
-  //   });
-  //   axios.get('/_api/v3/check-username', { params: { username: event.target.value } })
-  //     .then((res) => { return this.setState({ isValidUserName: res.data.valid }) });
-  // }
+  checkUserName(event) {
+    const axios = require('axios').create({
+      headers: {
+        'Content-Type': 'application/json',
+        'X-Requested-With': 'XMLHttpRequest',
+      },
+      responseType: 'json',
+    });
+    axios.get('/_api/v3/check-username', { params: { username: event.target.value } })
+      .then((res) => { return this.setState({ isValidUserName: res.data.valid }) });
+  }
 
   changeLanguage(meta) {
     i18next.changeLanguage(meta.id);

packages/app/src/pages/installer.page.tsx

@@ -1,27 +1,25 @@
-import React, { useEffect } from 'react';
+import React from 'react';
 
 import { pagePathUtils } from '@growi/core';
 import {
   NextPage, GetServerSideProps, GetServerSidePropsContext,
 } from 'next';
 import { serverSideTranslations } from 'next-i18next/serverSideTranslations';
-import Head from 'next/head';
 
 import { CrowiRequest } from '~/interfaces/crowi-request';
-import loggerFactory from '~/utils/logger';
 
-import { BasicLayout } from '../components/Layout/BasicLayout';
 import InstallerForm from '../components/InstallerForm';
 import {
   useCurrentPagePath, useCsrfToken,
   useAppTitle, useSiteUrl, useConfidential,
 } from '../stores/context';
 
-import { CommonProps, getNextI18NextConfig, getServerSideCommonProps, useCustomTitle } from './commons';
+import {
+  CommonProps, getNextI18NextConfig, getServerSideCommonProps,
+} from './commons';
 
 
-const logger = loggerFactory('growi:pages:all');
-const { isUsersHomePage, isTrashPage: _isTrashPage } = pagePathUtils;
+const { isTrashPage: _isTrashPage } = pagePathUtils;
 
 async function injectNextI18NextConfigurations(context: GetServerSidePropsContext, props: Props, namespacesRequired?: string[] | undefined): Promise<void> {
   const nextI18NextConfig = await getNextI18NextConfig(serverSideTranslations, context, namespacesRequired);

packages/app/src/server/routes/apiv3/users.js

@@ -648,7 +648,7 @@ module.exports = (crowi) => {
    *                      type: object
    *                      description: data of delete user
    */
-  router.delete('/:id/remove', loginRequiredStrictly, adminRequired,  addActivity, async(req, res) => {
+  router.delete('/:id/remove', loginRequiredStrictly, adminRequired, addActivity, async(req, res) => {
     const { id } = req.params;
 
     try {