fix eslint errors

website/static/js/code-block-buttons.js

@@ -1,6 +1,6 @@
-// Turn off ESLint for this file because it's sent down to users as-is.
-/* eslint-disable */
-window.addEventListener("load", function () {
+"use strict";
+
+window.addEventListener("load", () => {
   function button(label, ariaLabel, icon, className) {
     const btn = document.createElement("button");
     btn.classList.add("btnIcon", className);
@@ -17,9 +17,9 @@ window.addEventListener("load", function () {
   }
 
   function addButtons(codeBlockSelector, btn) {
-    document.querySelectorAll(codeBlockSelector).forEach(function (code) {
+    for (const code of document.querySelectorAll(codeBlockSelector)) {
       code.parentNode.appendChild(btn.cloneNode(true));
-    });
+    }
   }
 
   const copyIcon =
@@ -29,18 +29,18 @@ window.addEventListener("load", function () {
     ".hljs",
     button("Copy", "Copy code to clipboard", copyIcon, "btnClipboard")
   );
-
+  // eslint-disable-next-line no-undef
   const clipboard = new ClipboardJS(".btnClipboard", {
-    target: function (trigger) {
+    target(trigger) {
       return trigger.parentNode.querySelector("code");
     },
   });
 
-  clipboard.on("success", function (event) {
+  clipboard.on("success", (event) => {
     event.clearSelection();
     const textEl = event.trigger.querySelector(".btnIcon__label");
     textEl.textContent = "Copied";
-    setTimeout(function () {
+    setTimeout(() => {
       textEl.textContent = "Copy";
     }, 2000);
   });