Next.js, strict Typescript and missing / hard to find RenderPageResult type

问题

I have strict TypeScript setup. (Due to 'no implicit any return type' error/warning) I needed return type of one function in a custom Document component to be like:

  ctx.renderPage = (): RenderPageResult | Promise<RenderPageResult> =>
    originalRenderPage({
      enhanceApp: App => (props): ReactElement => sheets.collect(<App {...props} />),
    });

but couldn't figure out how to get a hold of RenderPageResult.

So I've added following to the next-env.d.ts file:

/// <reference types="next/dist/next-server/lib/utils" />

And imported RenderPageResult like this into the Document component:

import { RenderPageResult } from 'next/dist/next-server/lib/utils';

Is this correct way going about it?

Is there a better/correct way of doing it?

Thanks.

---

PS

Project uses "next": "^9.1.4", which is pretty much the latest release at the time of writing.

PPS

Question originally posted here: https://spectrum.chat/next-js/general/next-js-strict-typescript-and-missing-hard-to-find-renderpageresult-type~6cf4b4a8-769f-4a99-a72e-8ee2f8ad17db

Updates:

1. the next-env.d.ts file update mentioned above seems to add zero value (and based on TS docs probs is complete misunderstanding of the declaration files on my part).

来源：https://stackoverflow.com/questions/59245701/next-js-strict-typescript-and-missing-hard-to-find-renderpageresult-type