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> where you can't require any `npm` packages

You just have to introduce a build tool like ncc (https://github.com/vercel/ncc) which will bundle your app into a single JS file.

Serverless are not all the same. Cloudflare uses V8 and you can't require npm packages, right. Vercel and many other implementations use NodeJS and you Can require npm packages.

And you're limited to 50 sub-requests..

if it's a real issue and you have to issue lots of subrequests, then you don't really get advantage from all Cloudflare micro-optimisations. In such situation I would suggest to look for other Serverless providers, or maybe traditional approach works better in such case