React lazy implementation

react-lazy.js

import React from "react";

let IDS = 0;
const loaded = {};

export const lazy = modulePathResolver => {
  const id = IDS++;

  return props => {
    const LoadedComponent = loaded[id];

    if (LoadedComponent) {
      return <LoadedComponent {...props} />;
    }

    throw modulePathResolver().then(lazyModule => {
      const Component = lazyModule.default;
      loaded[id] = Component;
    });
  };
};