Hybrid AMP pages and getStaticProps doesn't export .amp pages

[MickCoelho]

Bug report

Describe the bug

next build won't export .amp pages when the hybrid pages use getStaticProps

To Reproduce

1 - Create an hybrid AMP page
2 - Run next build
3 - Both page.html and page.amp.html are export in the out folder
4 - Add getStaticProps onto the page
5 - Run next build
6 - Only the page.html is being exported

Code Sample

import { useAmp } from 'next/amp'
export const config = { amp: 'hybrid' };
export async function getStaticProps() {
  return {
    props: {},
  }
}

export default function Index() {
  const isAmp = useAmp()
  return (
    <div>
      <p>Hello Next.js</p>
    </div>
  );
}

Expected behavior

No matter if getStaticProps is being used, an hybrid AMP page should end up exporting both page.html and page.amp.html.

System information

• Version of Next.js: 9.3.2-canary.4

[balazsorban44]

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