Custom lazy function in React

lazy.js

export const lazy = (componentFactoryPromise) => {
  const componentPromise = componentFactoryPromise()
  let Component
  componentPromise.then(C => {
    Component = C.default
  })

  return (props) => {
    if(!Component) {
      throw componentPromise
    }

    return <Component {...props} />
  }
}