elm-pages-v3-beta/examples/simple/beta-index.js

export default function (elmLoaded) {
  console.log("Hello outside of promise!");
  elmLoaded.then((elmPagesApp) => {
    console.log("Inside of promise");
    elmPagesApp.ports.example.subscribe((message) => {
      console.log("Elm port message: ", message);
    });
  });
}