Refactor all `.length === 0` patterns in JS (#30045)

This pattern comes of often during review, so let's fix it once and for
all. Did not test, but changes are trivial enough imho.

(cherry picked from commit 8fe26fb314f1710139728d9118b455fc6a16cce2)

web_src/js/components/DiffCommitSelector.vue

@@ -103,7 +103,7 @@ export default {
       this.menuVisible = !this.menuVisible;
       // load our commits when the menu is not yet visible (it'll be toggled after loading)
       // and we got no commits
-      if (this.commits.length === 0 && this.menuVisible && !this.isLoading) {
+      if (!this.commits.length && this.menuVisible && !this.isLoading) {
         this.isLoading = true;
         try {
           await this.fetchCommits();
@@ -216,7 +216,7 @@ export default {
       <div
         v-if="lastReviewCommitSha != null" role="menuitem"
         class="vertical item"
-        :class="{disabled: commitsSinceLastReview === 0}"
+        :class="{disabled: !commitsSinceLastReview}"
         @keydown.enter="changesSinceLastReviewClick()"
         @click="changesSinceLastReviewClick()"
       >

web_src/js/components/RepoActionView.vue

@@ -462,7 +462,7 @@ export function initRepositoryActionView() {
                   {{ locale.showFullScreen }}
                 </a>
                 <div class="divider"/>
-                <a :class="['item', currentJob.steps.length === 0 ? 'disabled' : '']" :href="run.link+'/jobs/'+jobIndex+'/logs'" target="_blank">
+                <a :class="['item', !currentJob.steps.length ? 'disabled' : '']" :href="run.link+'/jobs/'+jobIndex+'/logs'" target="_blank">
                   <i class="icon"><SvgIcon name="octicon-download"/></i>
                   {{ locale.downloadLogs }}
                 </a>

web_src/js/components/RepoBranchTagSelector.vue

@@ -19,17 +19,19 @@ const sfc = {
       });
 
       // TODO: fix this anti-pattern: side-effects-in-computed-properties
-      this.active = (items.length === 0 && this.showCreateNewBranch ? 0 : -1);
+      this.active = !items.length && this.showCreateNewBranch ? 0 : -1;
       return items;
     },
     showNoResults() {
-      return this.filteredItems.length === 0 && !this.showCreateNewBranch;
+      return !this.filteredItems.length && !this.showCreateNewBranch;
     },
     showCreateNewBranch() {
       if (this.disableCreateBranch || !this.searchTerm) {
         return false;
       }
-      return this.items.filter((item) => item.name.toLowerCase() === this.searchTerm.toLowerCase()).length === 0;
+      return !this.items.filter((item) => {
+        return item.name.toLowerCase() === this.searchTerm.toLowerCase();
+      }).length;
     },
     formActionUrl() {
       return `${this.repoLink}/branches/_new/${this.branchNameSubURL}`;

web_src/js/features/admin/common.js

@@ -6,9 +6,7 @@ import {POST} from '../../modules/fetch.js';
 const {appSubUrl} = window.config;
 
 export function initAdminCommon() {
-  if ($('.page-content.admin').length === 0) {
-    return;
-  }
+  if (!$('.page-content.admin').length) return;
 
   // check whether appUrl(ROOT_URL) is correct, if not, show an error message
   checkAppUrl();

web_src/js/features/common-global.js

@@ -19,7 +19,7 @@ const {appUrl, appSubUrl, csrfToken, i18n} = window.config;
 export function initGlobalFormDirtyLeaveConfirm() {
   // Warn users that try to leave a page after entering data into a form.
   // Except on sign-in pages, and for forms marked as 'ignore-dirty'.
-  if ($('.user.signin').length === 0) {
+  if (!$('.user.signin').length) {
     $('form:not(.ignore-dirty)').areYouSure();
   }
 }

web_src/js/features/comp/SearchUserBox.js

@@ -34,7 +34,7 @@ export function initCompSearchUserBox() {
           }
         });
 
-        if (allowEmailInput && items.length === 0 && looksLikeEmailAddressCheck.test(searchQuery)) {
+        if (allowEmailInput && !items.length && looksLikeEmailAddressCheck.test(searchQuery)) {
           const resultItem = {
             title: searchQuery,
             description: allowEmailDescription,

web_src/js/features/repo-diff.js

@@ -214,8 +214,7 @@ function initRepoDiffShowMore() {
 
 export function initRepoDiffView() {
   initRepoDiffConversationForm();
-  const $diffFileList = $('#diff-file-list');
-  if ($diffFileList.length === 0) return;
+  if (!$('#diff-file-list').length) return;
   initDiffFileTree();
   initDiffCommitSelect();
   initRepoDiffShowMore();

web_src/js/features/repo-editor.js

@@ -39,11 +39,9 @@ function initEditPreviewTab($form) {
 }
 
 function initEditorForm() {
-  if ($('.repository .edit.form').length === 0) {
-    return;
-  }
-
-  initEditPreviewTab($('.repository .edit.form'));
+  const $form = $('.repository .edit.form');
+  if (!$form) return;
+  initEditPreviewTab($form);
 }
 
 function getCursorPosition($e) {
@@ -165,7 +163,7 @@ export function initRepoEditor() {
 
     commitButton?.addEventListener('click', (e) => {
       // A modal which asks if an empty file should be committed
-      if ($editArea.val().length === 0) {
+      if (!$editArea.val()) {
         $('#edit-empty-content-modal').modal({
           onApprove() {
             $('.edit.form').trigger('submit');

web_src/js/features/repo-findfile.js

@@ -77,7 +77,7 @@ function filterRepoFiles(filter) {
 
   const filterResult = filterRepoFilesWeighted(files, filter);
 
-  toggleElem(repoFindFileNoResult, filterResult.length === 0);
+  toggleElem(repoFindFileNoResult, !filterResult.length);
   for (const r of filterResult) {
     const row = document.createElement('tr');
     const cell = document.createElement('td');

web_src/js/features/repo-home.js

@@ -153,11 +153,11 @@ export function initRepoTopicBar() {
 
   $.fn.form.settings.rules.validateTopic = function (_values, regExp) {
     const $topics = $topicDropdown.children('a.ui.label');
-    const status = $topics.length === 0 || $topics.last()[0].getAttribute('data-value').match(regExp);
+    const status = !$topics.length || $topics.last()[0].getAttribute('data-value').match(regExp);
     if (!status) {
       $topics.last().removeClass('green').addClass('red');
     }
-    return status && $topicDropdown.children('a.ui.label.red').length === 0;
+    return status && !$topicDropdown.children('a.ui.label.red').length;
   };
 
   $topicForm.form({

web_src/js/features/repo-issue.js

@@ -362,7 +362,7 @@ export async function updateIssuesMeta(url, action, issue_ids, id) {
 }
 
 export function initRepoIssueComments() {
-  if ($('.repository.view.issue .timeline').length === 0) return;
+  if (!$('.repository.view.issue .timeline').length) return;
 
   $('.re-request-review').on('click', async function (e) {
     e.preventDefault();
@@ -377,7 +377,7 @@ export function initRepoIssueComments() {
 
   $(document).on('click', (event) => {
     const $urlTarget = $(':target');
-    if ($urlTarget.length === 0) return;
+    if (!$urlTarget.length) return;
 
     const urlTargetId = $urlTarget.attr('id');
     if (!urlTargetId) return;
@@ -385,7 +385,7 @@ export function initRepoIssueComments() {
 
     const $target = $(event.target);
 
-    if ($target.closest(`#${urlTargetId}`).length === 0) {
+    if (!$target.closest(`#${urlTargetId}`).length) {
       const scrollPosition = $(window).scrollTop();
       window.location.hash = '';
       $(window).scrollTop(scrollPosition);
@@ -478,9 +478,7 @@ export function initRepoPullRequestReview() {
   }
 
   // The following part is only for diff views
-  if ($('.repository.pull.diff').length === 0) {
-    return;
-  }
+  if (!$('.repository.pull.diff').length) return;
 
   const $reviewBtn = $('.js-btn-review');
   const $panel = $reviewBtn.parent().find('.review-box-panel');
@@ -529,7 +527,7 @@ export function initRepoPullRequestReview() {
 
     const $td = $ntr.find(`.add-comment-${side}`);
     const $commentCloud = $td.find('.comment-code-cloud');
-    if ($commentCloud.length === 0 && !$ntr.find('button[name="pending_review"]').length) {
+    if (!$commentCloud.length && !$ntr.find('button[name="pending_review"]').length) {
       try {
         const response = await GET($(this).closest('[data-new-comment-url]').attr('data-new-comment-url'));
         const html = await response.text();
@@ -626,7 +624,7 @@ export function initRepoIssueTitleEdit() {
     };
 
     const pullrequest_target_update_url = $(this).attr('data-target-update-url');
-    if ($editInput.val().length === 0 || $editInput.val() === $issueTitle.text()) {
+    if (!$editInput.val().length || $editInput.val() === $issueTitle.text()) {
       $editInput.val($issueTitle.text());
       await pullrequest_targetbranch_change(pullrequest_target_update_url);
     } else {

web_src/js/features/repo-legacy.js

@@ -50,9 +50,7 @@ function reloadConfirmDraftComment() {
 
 export function initRepoCommentForm() {
   const $commentForm = $('.comment.form');
-  if ($commentForm.length === 0) {
-    return;
-  }
+  if (!$commentForm.length) return;
 
   if ($commentForm.find('.field.combo-editor-dropzone').length) {
     // at the moment, if a form has multiple combo-markdown-editors, it must be an issue template form
@@ -202,7 +200,7 @@ export function initRepoCommentForm() {
           $($(this).data('id-selector')).addClass('tw-hidden');
         }
       });
-      if (listIds.length === 0) {
+      if (!listIds.length) {
         $noSelect.removeClass('tw-hidden');
       } else {
         $noSelect.addClass('tw-hidden');
@@ -329,7 +327,7 @@ async function onEditContent(event) {
   let comboMarkdownEditor;
 
   const setupDropzone = async ($dropzone) => {
-    if ($dropzone.length === 0) return null;
+    if (!$dropzone.length) return null;
 
     let disableRemovedfileEvent = false; // when resetting the dropzone (removeAllFiles), disable the "removedfile" event
     let fileUuidDict = {}; // to record: if a comment has been saved, then the uploaded files won't be deleted from server when clicking the Remove in the dropzone
@@ -485,9 +483,7 @@ async function onEditContent(event) {
 }
 
 export function initRepository() {
-  if ($('.page-content.repository').length === 0) {
-    return;
-  }
+  if (!$('.page-content.repository').length) return;
 
   initRepoBranchTagSelector('.js-branch-tag-selector');
 

web_src/js/features/repo-settings.js

@@ -71,7 +71,7 @@ export function initRepoSettingSearchTeamBox() {
 }
 
 export function initRepoSettingGitHook() {
-  if ($('.edit.githook').length === 0) return;
+  if (!$('.edit.githook').length) return;
   const filename = document.querySelector('.hook-filename').textContent;
   const _promise = createMonaco($('#content')[0], filename, {language: 'shell'});
 }

web_src/js/features/user-settings.js

@@ -1,7 +1,7 @@
 import {hideElem, showElem} from '../utils/dom.js';
 
 export function initUserSettings() {
-  if (document.querySelectorAll('.user.settings.profile').length === 0) return;
+  if (!document.querySelectorAll('.user.settings.profile').length) return;
 
   const usernameInput = document.getElementById('username');
   if (!usernameInput) return;