Remove eslint_d support

Remove eslint_d support because eslint_d seems to support only older versions
like ESLint 4+, 5+.

CHANGELOG.develop

@@ -1739,7 +1739,6 @@ Benner and Paweł Siudak):
   (thanks to Sylvain Benner)
 - Open =.jsx= files with =rjsx-mode= (thanks to Thomas de Beauchêne)
 - Fixes React imports when using web beautify. (thanks to Ismael)
-- Prefer eslint_d to eslint (thanks to Seong Yong-ju)
 **** Ruby
 - Add support for =org-babel= (thanks to Muneeb Shaikh)
 - Highlight debugger keywords (thanks to Alexander Berezovsky and Eivind Fonn)

layers/+frameworks/react/packages.el

@@ -45,8 +45,7 @@
   (with-eval-after-load 'flycheck
     (dolist (checker '(javascript-eslint javascript-standard))
       (flycheck-add-mode checker 'rjsx-mode)))
-  (spacemacs/enable-flycheck 'rjsx-mode)
-  (add-hook 'rjsx-mode-hook #'spacemacs//javascript-setup-eslint t))
+  (spacemacs/enable-flycheck 'rjsx-mode))
 
 (defun react/post-init-js-doc ()
   (add-hook 'rjsx-mode-hook 'spacemacs/js-doc-require)

layers/+lang/javascript/funcs.el

@@ -65,13 +65,6 @@
     (message (concat "Tern was configured as the javascript backend but "
                      "the `tern' layer is not present in your `.spacemacs'!"))))
 
-
-;; flycheck
-
-(defun spacemacs//javascript-setup-eslint ()
-  (when-let ((found (executable-find "eslint_d")))
-    (set (make-local-variable 'flycheck-javascript-eslint-executable) found)))
-
 
 ;; js-doc
 

layers/+lang/javascript/packages.el

@@ -45,8 +45,7 @@
   (add-hook 'js2-mode-local-vars-hook #'spacemacs//javascript-setup-company))
 
 (defun javascript/post-init-flycheck ()
-  (spacemacs/enable-flycheck 'js2-mode)
-  (add-hook 'js2-mode-hook #'spacemacs//javascript-setup-eslint t))
+  (spacemacs/enable-flycheck 'js2-mode))
 
 (defun javascript/post-init-ggtags ()
   (add-hook 'js2-mode-local-vars-hook #'spacemacs/ggtags-mode-enable))