process.env.__NEXT_PRIVATE_PREBUNDLED_REACT

https://github.com/vercel/next.js/blob/8eb14280e8ea94e479aebf19928c9ef413b91124/packages/next/src/server/require-hook.ts#L30

Related, on open-next: https://github.com/serverless-stack/open-next/blob/main/README.md#workaround-set-__next_private_prebundled_react-to-use-prebundled-react

this is fine

everything is fine