@SZJX
I don’t think the issue is connected to lsp-mode or emacs in general.
lsp-mode will only report errors/warnings, that elixir-ls passes it. So in order to integrate credo to
lsp-mode it should be implemented in elixir-ls. I don’t know if elixir-ls has any kind of plugin endpoint though.
I.e. In python world there is a bunch linters you can use. If you want them to work with lsp, you need to add a plugin of that linter to python-language-server. So the ls will report messages from that linter to lsp-mode client.
