Make sure you are on ocaml 4.14.0 or later.

For doom emacs:

• SPC f p to open the Doom config file dialog
• Select config.el
• Add (setq lsp-ocaml-lsp-server-command '("esy" "ocamllsp" "--fallback-read-dot-merlin"))
• Restart emacs entirely
  • Or: reload using SPC h r r then restart the LSP with M-x => lsp-workspace-restart

Links

• Discord thread
• Discord channel
• Discord server