Build error occurred: fetch is not found globally and no fetcher passed

I was reading through the Next.js 9.4 changelog and noticed “Improved Built-in Fetch Support”. So I got rid of my isomorphic-unfetch package but now I can’t build anymore as apollo-link-http complains about fetch missing.

const httpLink = new HttpLink({
  uri: process.env.NEXT_PUBLIC_API_URL,
});

> Build error occurred
Invariant Violation: 
fetch is not found globally and no fetcher passed, to fix pass a fetch for
your environment like https://www.npmjs.com/package/node-fetch.

For example:
import fetch from 'node-fetch';
import { createHttpLink } from 'apollo-link-http';

In dev mode this works (fetch is not imported, using built-in one):

const httpLink = new HttpLink({
  uri: process.env.NEXT_PUBLIC_API_URL,
  fetch,
});

But during building I end up with the following error:

> Build error occurred
ReferenceError: fetch is not defined
    at NetworkService.createApolloClient

[timneutkens]

Thanks! That helped track it down, I’ve fixed it in #12832

[balazsorban44]

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