lang/javascript: more intelligent JSX detection

modules/lang/javascript/config.el

@@ -104,6 +104,18 @@
   :commands rjsx-mode
   :mode "\\.jsx$"
   :mode "components/.+\\.js$"
+  :init
+  ;; auto-detect JSX file
+  (push (cons (lambda ()
+                (and (equal (file-name-extension buffer-file-name) "js")
+                     (re-search-forward "\\(^\\s-*import React\\|\\( from \\|require(\\)[\"']react\\)"
+                                        magic-mode-regexp-match-limit t)
+                     (progn
+                       (goto-char (match-beginning 1))
+                       (not (sp-point-in-string-or-comment)))))
+              'rjsx-mode)
+        magic-mode-alist)
+
   :config
   ;; disable electric keys (I use snippets and `emmet-mode' instead)
   (define-key rjsx-mode-map "<" nil)