component_helper.rb

    module ComponentHelper
      def react_component(name, props: {})
        content_tag(:div, nil, id: name, data: { props: props.to_json, handler: "react" })
      end

site.js

document.addEventListener("turbolinks:load", () => {
  const tags = document.querySelectorAll("[data-handler=\"react\"]");
  [].forEach.call(tags, (tag) => {
    const data = humps.camelizeKeys(JSON.parse(tag.getAttribute("data-props")));
    const componentName = tag.getAttribute("id");
    const Component = apps[componentName];
    ReactDOM.render(<Component {...data} />, tag);
  });
});