Comment by treeblah

I use web-mode + typescript-language-server for React+TSX. Whether or not you choose to use eglot or lsp-mode, I'd still recommend following the lsp-mode performance guide: https://emacs-lsp.github.io/lsp-mode/page/performance/. Those tips are useful for all setups.

  (use-package web-mode
    :ensure t
    :mode (("\\.ts\\'" . web-mode)
           ("\\.js\\'" . web-mode)
           ("\\.mjs\\'" . web-mode)
           ("\\.tsx\\'" . web-mode)
           ("\\.jsx\\'" . web-mode))
    :config
    (setq web-mode-content-types-alist
   '(("jsx" . "\\.js[x]?\\'"))))

  (use-package eglot
    :ensure t
    :hook (web-mode . eglot-ensure))