title: How to set rjsx mode for every js file in Spacemacs?
body: <p>I've already tried putting <code>(add-to-list 'auto-mode-alist '("\\.js\\'" . rjsx-mode))</code> in <code>dotspacemacs/user-config</code> but js files are not opening with rjsx mode.<br>
  And yes, i've already tried reloading <code>init.el</code> and fully closing spacemacs.</p>