eglot-flycheck-config.el

;; Eglot ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(use-package eglot
  :after
  (project projectile)
  :config

  ;; Scala
  (add-to-list 'eglot-server-programs '(scala-mode . ("metals-emacs")))

  ;; React
  (add-to-list 'eglot-server-programs
               '((rjsx-mode) "typescript-language-server" "--stdio"))

  ;; TODO: Testing out this configuration
  ;; Define workspace configuration for typescript-language-server
  ;; (setq-local eglot-workspace-configuration
  ;;             '((:typescript . (:preferences
  ;;                               (:disableSuggestions false)
  ;;                               :diagnostics
  ;;                               (:noSemanticValidation true)))))

  ;; React + Typescript
  (add-to-list 'eglot-server-programs
               '((typescriptreact-mode) "typescript-language-server" "--stdio"))

  ;; Haskell
  (add-hook 'haskell-mode-hook 'eglot-ensure)
  (setq-default eglot-workspace-configuration
                '((haskell
                   (plugin
                    (stan
                     (globalOn . :json-false))))
                  ))  ;; disable stan

  (setq eglot-confirm-server-edits nil)

  ;; Ensure Flymake is disabled after Eglot is initialized
  ;; we want to use Flycheck instead
  (add-hook 'eglot-managed-mode-hook (lambda ()
                                     (flymake-mode -1)
                                     (flycheck-mode 1)))

  (put 'eglot-node 'flymake-overlay-control nil)
  (put 'eglot-warning 'flymake-overlay-control nil)
  (put 'eglot-error 'flymake-overlay-control nil)

  :hook
  (typescript-ts-base-mode . eglot-ensure)
  (rjsx-mode . eglot-ensure)

  :custom
  (eglot-autoshutdown t)
  )

;; Flycheck ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(use-package flycheck
  :ensure t
  :init
  (global-flycheck-mode)
  :config
  (flymake-mode -1)
  (advice-add 'flycheck-eslint-config-exists-p :override (lambda() t))
  (flycheck-add-mode 'javascript-eslint 'rjsx-mode)
  (setq flycheck-javascript-eslint-executable "eslint_d"))

(use-package flycheck-eglot
  :ensure t
  :after (flycheck eglot)
  :custom (flycheck-eglot-exclusive nil)
  :config
  (global-flycheck-eglot-mode 1))

(add-hook 'after-init-hook #'global-flycheck-mode)