enable eslint on aqt/data/web/js

qt/aqt/data/web/js/BUILD.bazel

@@ -60,10 +60,10 @@ prettier_test(
 )
 
 # source files need fixing first
-# eslint_test(
-#     name = "eslint",
-#     srcs = glob(["*.ts"]),
-# )
+eslint_test(
+    name = "eslint",
+    srcs = glob(["*.ts"]),
+)
 
 exports_files([
     "mathjax.js",

qt/aqt/data/web/js/deckbrowser.ts

@@ -8,7 +8,7 @@ function init() {
         scroll: false,
 
         // can't use "helper: 'clone'" because of a bug in jQuery 1.5
-        helper: function (event) {
+        helper: function (_event) {
             return $(this).clone(false);
         },
         delay: 200,

qt/aqt/data/web/js/pycmd.d.ts

@@ -1 +1 @@
-declare function pycmd(cmd: string, result_callback?: (arg: any) => void): any;
+declare function pycmd(cmd: string, result_callback?: (arg: unknown) => void): unknown;

qt/aqt/data/web/js/reviewer-bottom.ts

@@ -1,7 +1,11 @@
 /* Copyright: Ankitects Pty Ltd and contributors
  * License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html */
 
-var time: number; // set in python code
+/* eslint
+@typescript-eslint/no-unused-vars: "off",
+*/
+
+let time: number; // set in python code
 
 let maxTime = 0;
 document.addEventListener("DOMContentLoaded", () => {
@@ -41,8 +45,8 @@ function showAnswer(txt: string): void {
     document.getElementById("middle").innerHTML = txt;
 }
 
-function selectedAnswerButton() {
-    let node = document.activeElement as HTMLElement;
+function selectedAnswerButton(): string {
+    const node = document.activeElement as HTMLElement;
     if (!node) {
         return;
     }

qt/aqt/data/web/js/toolbar.ts

@@ -1,6 +1,10 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
+/* eslint
+@typescript-eslint/no-unused-vars: "off",
+*/
+
 enum SyncState {
     NoChanges = 0,
     Normal,