Turbolinks 5 & Facebook SDK & ES6

facebook-sdk.js

(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v3.1&appId=YOUR_APP_ID&autoLogAppEvents=1";
  fjs.parentNode.insertBefore(js, fjs);
}(document, "script", "facebook-jssdk"));

document.addEventListener("DOMContentLoaded", () => {
  let fbRoot;

  const detatch = (elem) => {
    return elem.parentElement.removeChild(elem);
  }

  const saveFacebookRoot = () => {
    if (document.getElementById("fb-root")) {
      fbRoot = detatch(document.getElementById("fb-root"));
    }
  };

  const restoreFacebookRoot = () => {
    if (fbRoot != null) {
      if (document.getElementById("fb-root")) {
        document.getElementById("fb-root").replaceWith(fbRoot);
      } else {
        document.body.appendChild(fbRoot);
      }
    }

    if (typeof FB !== "undefined" && FB !== null) { // Instance of FacebookSDK
      FB.XFBML.parse();
    }
  };

  document.addEventListener("turbolinks:request-start", saveFacebookRoot)
  document.addEventListener("turbolinks:load", restoreFacebookRoot)
});