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
61105d0618
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.

web_src/js/features/comp/LabelEdit.ts

@@ -0,0 +1,96 @@
+import $ from 'jquery';
+
+function isExclusiveScopeName(name) {
+  return /.*[^/]\/[^/].*/.test(name);
+}
+
+function updateExclusiveLabelEdit(form) {
+  const nameInput = document.querySelector(`${form} .label-name-input`);
+  const exclusiveField = document.querySelector(`${form} .label-exclusive-input-field`);
+  const exclusiveCheckbox = document.querySelector(`${form} .label-exclusive-input`);
+  const exclusiveWarning = document.querySelector(`${form} .label-exclusive-warning`);
+
+  if (isExclusiveScopeName(nameInput.value)) {
+    exclusiveField?.classList.remove('muted');
+    exclusiveField?.removeAttribute('aria-disabled');
+    if (exclusiveCheckbox.checked && exclusiveCheckbox.getAttribute('data-exclusive-warn')) {
+      exclusiveWarning?.classList.remove('tw-hidden');
+    } else {
+      exclusiveWarning?.classList.add('tw-hidden');
+    }
+  } else {
+    exclusiveField?.classList.add('muted');
+    exclusiveField?.setAttribute('aria-disabled', 'true');
+    exclusiveWarning?.classList.add('tw-hidden');
+  }
+}
+
+export function initCompLabelEdit(selector) {
+  if (!$(selector).length) return;
+
+  // Create label
+  $('.new-label.button').on('click', () => {
+    updateExclusiveLabelEdit('.new-label');
+    $('.new-label.modal').modal({
+      onApprove() {
+        const form = document.querySelector('.new-label.form');
+        if (!form.checkValidity()) {
+          form.reportValidity();
+          return false;
+        }
+        $('.new-label.form').trigger('submit');
+      },
+    }).modal('show');
+    return false;
+  });
+
+  // Edit label
+  $('.edit-label-button').on('click', function () {
+    $('#label-modal-id').val($(this).data('id'));
+
+    const $nameInput = $('.edit-label .label-name-input');
+    $nameInput.val($(this).data('title'));
+
+    const $isArchivedCheckbox = $('.edit-label .label-is-archived-input');
+    $isArchivedCheckbox[0].checked = this.hasAttribute('data-is-archived');
+
+    const $exclusiveCheckbox = $('.edit-label .label-exclusive-input');
+    $exclusiveCheckbox[0].checked = this.hasAttribute('data-exclusive');
+    // Warn when label was previously not exclusive and used in issues
+    $exclusiveCheckbox.data('exclusive-warn',
+      $(this).data('num-issues') > 0 &&
+      (!this.hasAttribute('data-exclusive') || !isExclusiveScopeName($nameInput.val())));
+    updateExclusiveLabelEdit('.edit-label');
+
+    $('.edit-label .label-desc-input').val(this.getAttribute('data-description'));
+
+    const colorInput = document.querySelector('.edit-label .js-color-picker-input input');
+    colorInput.value = this.getAttribute('data-color');
+    colorInput.dispatchEvent(new Event('input', {bubbles: true}));
+
+    $('.edit-label.modal').modal({
+      onApprove() {
+        const form = document.querySelector('.edit-label.form');
+        if (!form.checkValidity()) {
+          form.reportValidity();
+          return false;
+        }
+        $('.edit-label.form').trigger('submit');
+      },
+    }).modal('show');
+    return false;
+  });
+
+  $('.new-label .label-name-input').on('input', () => {
+    updateExclusiveLabelEdit('.new-label');
+  });
+  $('.new-label .label-exclusive-input').on('change', () => {
+    updateExclusiveLabelEdit('.new-label');
+  });
+  $('.edit-label .label-name-input').on('input', () => {
+    updateExclusiveLabelEdit('.edit-label');
+  });
+  $('.edit-label .label-exclusive-input').on('change', () => {
+    updateExclusiveLabelEdit('.edit-label');
+  });
+}