Install EmmyLua Language server

Download EmmyLua jar from EmmyLua Language Server and store it in your ~/.emacs.d/ folder. If you want to store it in a different place change lsp-clients-emmy-lua-jar-path accordingly.

If you are using company-lsp make sure that client-side filtering is enabled.

  (add-to-list 'company-lsp-filter-candidates '(lsp-emmy-lua . t))