taihu/app/utils/loadable.tsx

import React, { lazy, Suspense } from 'react'

function loadable<P> (importFunc: () => Promise<{default: React.ComponentType<P>}>, { fallback = null } = { fallback: null }) {
  const LazyComponent = lazy<React.ComponentType<P>>(importFunc)

  return (props: React.ComponentPropsWithRef<React.ComponentClass<P>>) => (
    <Suspense fallback={fallback}>
      <LazyComponent {...props} />
    </Suspense>
  )
}

export default loadable