I bundled it with esbuild for an astro/payload monorepo setup and it worked fine.

Nice, is it something you can share? If not could you briefly mention the steps. Even high level would be helpful

Yep! There are probably issues with this setup, but I wrote a small plugin to allow them to work in the same repo, sharing the same express instance: https://github.com/coxmi/astro-payload-plugin

Because of various ES module/CJS issues I had to bundle payload with esbuild and change the extension to cjs. The config wasn't being properly found/parsed by their webpack/ts-node setup, and because payload loads its own config in dev mode, it's all a bit complicated. This was the easiest fix I could find.

My example repo can be found here: https://github.com/coxmi/astro-payload-example

Which was sort-of based on Payload's own custom server example here: https://github.com/payloadcms/payload/tree/main/examples/cus...

We have a package that allows you to deploy Payload in a NextJS app serverlessly, and it works great. I actually tried bundling as one endpoint early on while exploring with the NextJS approach and it seemed to work perfectly. But honestly I can’t remember the pros and cons.

I’d say give it a shot, and if you need anything, let us know!