Fix commenting JS in web-mode

modules/lang/web/+html.el

@@ -63,6 +63,27 @@
 
   (add-to-list 'web-mode-engines-alist '("elixir" . "\\.eex\\'"))
 
+  (let ((types '("javascript" "jsx")))
+    (setq web-mode-comment-formats
+          (cl-remove-if (lambda (item) (member (car item) types))
+                        web-mode-comment-formats))
+    (dolist (type types)
+      (push (cons type "//") web-mode-comment-formats)))
+
+  (add-hook! 'web-mode-hook
+    (defun +web--fix-js-comments-h ()
+      "Fix comment handling in `web-mode' for JavaScript."
+      (when (member web-mode-content-type '("javascript" "jsx"))
+        ;; For some reason the default is to insert HTML comments even
+        ;; in JavaScript.
+        (setq-local comment-start "//")
+        (setq-local comment-end "")
+        ;; Needed since otherwise the default value generated by
+        ;; `comment-normalize-vars' will key off the syntax and think
+        ;; that a single "/" starts a comment, which completely borks
+        ;; auto-fill.
+        (setq-local comment-start-skip "// *"))))
+
   (map! :map web-mode-map
         (:localleader
           :desc "Rehighlight buffer" "h" #'web-mode-buffer-highlight