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A new React 19 feature that might have gone unnoticed: ReactDOMStatic.prerender(<App />) It's like the old renderToString API, but unlike renderToString, prerender will wait for Suspense boundaries to finish before returning the HTML.

If this is for SSG and waits for all suspense boundaries, why does it return a stream and not a string?

Even for SSG, if you’re uploading to a CDN it’s more efficient to use their streaming APIs and skip decoding and encoding again, but in the future prerender could be used to stream the shell in a response and resume the shell for dynamic content.