Does anyone have any tips for excluding files from LSP’s file watchers in a project? For example, I don’t need the node_modules folder to be watched in a Clojurescript project, and it’s big enough that it causes warnings about performance when it starts up.

I’ve tried following the instructions here: https://emacs-lsp.github.io/lsp-mode/page/file-watchers/

Specifically, with

(with-eval-after-load 'lsp-mode
  (add-to-list 'lsp-file-watch-ignored-directories "[/\\\\]\\node_modules\\'"))

That doesn’t seem to have worked. And ideally, I would add these to .dir-locals.el on a per-project basis.

Solved: Better google-fu led me to https://clojurians-log.clojureverse.org/lsp/2021-04-12

My .dir-locals.el now looks like ((nil . ((lsp-file-watch-ignored-directories . ("/node_modules$")))))

Almost sure lsp-mode already have node_modules excluded

It’s possible. There are a bunch of folders in that project that I excluded but left out of the example for brevity, so I might have ended up duplicating node_modules.