Convert frontend code to typescript (#31559)

None of the frontend js/ts files was touched besides these two commands
(edit: no longer true, I touched one file in
https://github.com/go-gitea/gitea/pull/31559/commits/61105d0618e285d97e95044bfb64415f364a4526
because of a deprecation that was not showing before the rename).

`tsc` currently reports 778 errors, so I have disabled it in CI as
planned.

Everything appears to work fine.

1 files changed, 53 insertions, 0 deletions

diff --git a/web_src/js/features/repo-diff-commit.ts b/web_src/js/features/repo-diff-commit.ts
new file mode 100644
index 0000000000..c115e6300a
--- /dev/null
+++ b/web_src/js/features/repo-diff-commit.ts
@@ -0,0 +1,53 @@
+import {hideElem, showElem, toggleElem} from '../utils/dom.ts';
+import {GET} from '../modules/fetch.ts';
+
+async function loadBranchesAndTags(area, loadingButton) {
+  loadingButton.classList.add('disabled');
+  try {
+    const res = await GET(loadingButton.getAttribute('data-fetch-url'));
+    const data = await res.json();
+    hideElem(loadingButton);
+    addTags(area, data.tags);
+    addBranches(area, data.branches, data.default_branch);
+    showElem(area.querySelectorAll('.branch-and-tag-detail'));
+  } finally {
+    loadingButton.classList.remove('disabled');
+  }
+}
+
+function addTags(area, tags) {
+  const tagArea = area.querySelector('.tag-area');
+  toggleElem(tagArea.parentElement, tags.length > 0);
+  for (const tag of tags) {
+    addLink(tagArea, tag.web_link, tag.name);
+  }
+}
+
+function addBranches(area, branches, defaultBranch) {
+  const defaultBranchTooltip = area.getAttribute('data-text-default-branch-tooltip');
+  const branchArea = area.querySelector('.branch-area');
+  toggleElem(branchArea.parentElement, branches.length > 0);
+  for (const branch of branches) {
+    const tooltip = defaultBranch === branch.name ? defaultBranchTooltip : null;
+    addLink(branchArea, branch.web_link, branch.name, tooltip);
+  }
+}
+
+function addLink(parent, href, text, tooltip) {
+  const link = document.createElement('a');
+  link.classList.add('muted', 'tw-px-1');
+  link.href = href;
+  link.textContent = text;
+  if (tooltip) {
+    link.classList.add('tw-border', 'tw-border-secondary', 'tw-rounded');
+    link.setAttribute('data-tooltip-content', tooltip);
+  }
+  parent.append(link);
+}
+
+export function initRepoDiffCommitBranchesAndTags() {
+  for (const area of document.querySelectorAll('.branch-and-tag-area')) {
+    const btn = area.querySelector('.load-branches-and-tags');
+    btn.addEventListener('click', () => loadBranchesAndTags(area, btn));
+  }
+}