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Comment by palmdeezy | Hacker News Reader

Turborepo author here…

We do not invalidate the whole graph anymore for a lockfile change. We now have a sophisticated parser that can calculate if a change within the lockfile should actually alter the hash of a given target. In addition to higher cache hit rates, this is what powers our `turbo prune` command which allows teams to create slices of their monorepo for a target and its dependencies…useful for those building in Docker.

Prune docs: https://turbo.build/repo/docs/reference/command-line-referen...

Turborepo is much more scalable now than when we spoke pre-Vercel acquisition. It now powers the core web codebases at Netflix, Snap, Disney Streaming, Hearst, Plex and thousands of other high-performance teams. You can see a full list of users here: https://turbo.build/showcase

Would be happy to reconnect about Uber’s web monorepo sometime.

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Can Prune be used to build a bundle (as in a zip) for, say AWS Lambda, which includes only the dependencies (and not dev dependencies)? I've played around with pnpm's deploy but it felt a bit lackluster. Especially talking about situation where one has a backend package and some shared package. The bundle should contain all dependencies (but not dev dependencies) of the backend package and shared package and of course the built shared package should also be include in the bundle's node_modules.

Yes! Prune then zip the output folder.

Kind of. Poster asked if you can prune only deps and exclude dev deps. That's currently unsupported: https://github.com/vercel/turbo/issues/1100

That's correct. However, I've tried to use prune now, not sure if I am using it correctly, but that's why I do:

I build my packages regularly (not pruned), then I prune with scope "backend". Apparently the pruned directory contains node_modules with empty packages, not sure what reason is for that; I just ignored it. In the resulting directory I then run `pnpm install --prod`. Only the regular dependencies will be installed. I think this is enough for my usecase. I am not sure if prune is supposed to be used for this approach though.

You can do that with esbuild. Just bundle the handler entry into a single file and esbuild will tree shake the cruft out. That's the approach taken by AWS CDK as well.

Yeah, that always works, of course, even though you might want to externalize certain dependencies still. In this case I don't want to bundle the code (although I might end up doing that, anyway)

You can give esbuild a list of dependencies that you want to be external and it won’t bundle them, I’ve done it with the AWS SDK and it works as expected.

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