Add types to various low-level functions (#31781)

Adds types to various low-level modules. All changes are type-only, no
runtime changes. `tsc` now reports 38 less errors.

One problem was that `@types/sortablejs` does not accept promise return
in its functions which triggered the linter, so I disabled the rules on
those line.

web_src/js/features/dropzone.ts

@@ -52,7 +52,7 @@ function addCopyLink(file) {
   copyLinkEl.addEventListener('click', async (e) => {
     e.preventDefault();
     const success = await clippie(generateMarkdownLinkForAttachment(file));
-    showTemporaryTooltip(e.target, success ? i18n.copy_success : i18n.copy_error);
+    showTemporaryTooltip(e.target as Element, success ? i18n.copy_success : i18n.copy_error);
   });
   file.previewTemplate.append(copyLinkEl);
 }

web_src/js/features/repo-issue-list.ts

@@ -196,7 +196,7 @@ async function initIssuePinSort() {
 
   createSortable(pinDiv, {
     group: 'shared',
-    onEnd: pinMoveEnd,
+    onEnd: pinMoveEnd, // eslint-disable-line @typescript-eslint/no-misused-promises
   });
 }
 

web_src/js/features/repo-projects.ts

@@ -60,7 +60,7 @@ async function initRepoProjectSortable() {
     handle: '.project-column-header',
     delayOnTouchOnly: true,
     delay: 500,
-    onSort: async () => {
+    onSort: async () => { // eslint-disable-line @typescript-eslint/no-misused-promises
       boardColumns = mainBoard.querySelectorAll('.project-column');
 
       const columnSorting = {
@@ -84,8 +84,8 @@ async function initRepoProjectSortable() {
     const boardCardList = boardColumn.querySelectorAll('.cards')[0];
     createSortable(boardCardList, {
       group: 'shared',
-      onAdd: moveIssue,
-      onUpdate: moveIssue,
+      onAdd: moveIssue, // eslint-disable-line @typescript-eslint/no-misused-promises
+      onUpdate: moveIssue, // eslint-disable-line @typescript-eslint/no-misused-promises
       delayOnTouchOnly: true,
       delay: 500,
     });

web_src/js/features/stopwatch.ts

@@ -27,7 +27,7 @@ export function initStopwatch() {
     stopwatchEl.removeAttribute('href'); // intended for noscript mode only
 
     createTippy(stopwatchEl, {
-      content: stopwatchPopup.cloneNode(true),
+      content: stopwatchPopup.cloneNode(true) as Element,
       placement: 'bottom-end',
       trigger: 'click',
       maxWidth: 'none',