Update modules/lang/*

modules/lang/javascript/autoload.el

@@ -0,0 +1,21 @@
+;;; lang/javascript/autoload.el
+
+;;;###autoload
+(defun +javascript/install ()
+  "Installs NodeJS and tern."
+  (interactive)
+  (pcase (doom-system-os)
+    ('arch
+     (unless (and (executable-find "node")
+                  (executable-find "npm"))
+       (doom-sudo "pacman --needed --noconfirm -S nodejs npm")))
+    ('debian) ;; TODO
+    ('macos
+     (unless (executable-find "node")
+       (doom-sh "brew install node")))
+    (_ (error "Not a supported OS")))
+  (unless (executable-find "node")
+    (error "node isn't installed, run `+javascript/install' again"))
+  (unless (executable-find "tern")
+    (sh "npm -g install tern")))
+