Async import pattern

App.re

PageModule.fetchModule("./MyComponent")
  |> Js.Promise.then_(m => send(SetRootElement(m())));

MyComponent.re

let component = ReasonReact.statelessComponent("MyComponent");
let make = (_) => {
  ...component,
  render: (_) => <div />
};

let make = () => make([||]);

MyComponent.rei

include PageModule.M;

PageModule.re

module type M = {
  let make: unit => ReasonReact.reactElement;
};

type m = Js.t({ . make: unit => ReasonReact.reactElement });

[@bs.val] external fetchModule: string => Js.Promise.t(m) = "import";