An example of the syntax.

react.lisp

(define-easy-handler (react-stuff :uri "/react/all") ()
  (send-react
   (defvar panel (defreact
                     (json display-name "Panel"
                           component-will-mount (lambda ()
                                                  ;; (->) is (ps:chain) and (.>) bind()s 'this' to the block.
                                                  (something-with-a-callback (.> (lambda (x) (-> this (do-something)))))
                           render (lambda ()
                                    (rce "div" (json class-name "col-md-6")
                                         (rce "div" (json class-name "panel panel-default panel-borders")
                                              (rce "div" (json class-name "panel-heading")
                                                   (@ this props header))
                                              (rce "div" (json class-name "panel-body")
                                                   (@ this props body))))))))))