[question] Emacs 27 seems to have great support for JS/JSX now, is it still beneficial to use RJSX-mode?

[ianyepan]

As titled.

[felipeochoa]

If you use any tools that rely on the js2 AST (like js2-refactor) or mocha.el, then you still need to use RJSX. More details in mooz/js2-mode#527

[ianyepan]

Thanks for the reply, but as a newcomer in coding JS in Emacs (I used to heavily rely on VSCode since everything just worked OOTB), I found it kinda overwhelming to see js-mode, js-jsx-mode, js2-mode, js2-jsx-mode, js3-mode, rjsx-mode, web-mode etc...

On top of that, I use Tide (tsserver) to provide me with intelligent code actions. But I don't quite understand the major modes yet.

P.s. here's my current setup on both Emacs 26.2 and 27:

(use-package tide
  :after (company flycheck)
  :config
  (define-key tide-mode-map (kbd "s-b") 'tide-jump-to-definition)
  (define-key tide-mode-map (kbd "s-[") 'tide-jump-back))

(use-package rjsx-mode
  :mode ("\\.jsx?$" . rjsx-mode)
  :hook (rjsx-mode . tide-setup)
  :config (setq js-indent-level 2
                js2-strict-missing-semi-warning nil))

(use-package web-mode
  :mode
  ("\\.html?$". web-mode)
  ("\\.css$". web-mode)
  ("\\.tsx$". web-mode)
  :config
  (defun my/tsx-setup ()
    (when (and (stringp buffer-file-name)
               (string-match "\\.tsx$" buffer-file-name))
      (tide-setup)))
  (add-hook 'web-mode-hook 'my/tsx-setup))

[felipeochoa]

I haven't used the new js mode, so can't offer an opinion there, sorry!

[ianyepan]

i see, thanks for the reply still. No matter what rjsx still has the best syntax highlighting IME.

[llemaitre19]

After having tested again embedded support of JSX in Emacs 28.2, I go back to RJSX-mode which still works better out of box for commenting JSX parts (and even after a configuration effort).