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Programmatically output HTML string of next.js page

In my Next.js v10 app, I have a pages/email.tsx file. If I run next dev and visit http://localhost:3000/email, I see it working. This page is a server-side rendered page, it has a getServerSideProps function.

Now I want to retrieve the HTML output, as a string, of that page. I only care about the initial render of that page.

What I do now is just a curl of http://localhost:3000/email, and that works. However, it requires me to spawn a server, and run curl on it.

I was wondering, is there an internal next.js function to programmatically output the HTML string of a next.js page? That is, without making a network call.

const rawHTML: string = toHtml('/email'); // What should `toHtml` look like?
console.log(rawHTML); // "<html>...</html>"

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