Create a component, React style. Should be called with a map, looking like this: {:get-initial-state (fn [this]) :component-will-receive-props (fn [this new-argv]) :should-component-update (fn [this old-argv new-argv]) :component-will-mount (fn [this]) :component-did-mount (fn [this]) :component-will-update (fn [this new-argv]) :component-did-update (fn [this old-argv]) :component-will-unmount (fn [this]) :reagent-render (fn [args....])} ;; or :render (fn [this]) Everything is optional, except either :reagent-render or :render.