Bun not being detected within monorepo

neallPRO

3 months ago

Issue

Neither Nixpack nor Railpack detect that an application uses Bun

Context

  • I have a Turborepo monorepo where all applications use Node.js, except one (which uses Bun instead)

  • I don't have a build script for this application (sidenote: what's the right way to handle this? I'm running TS directly, so I'm just passing an echo for now)

  • My start script is pnpm --filter @org/myapp run start (which points to bun run src/index.ts )

  • I don't have a bun.lockb file (which might be the cue the builder is looking for?) because I'm using pnpm for package management

  • I do have a bunfig.toml file in the app root

I might have missed something in the docs! Thanks

Awaiting User Response

5 Replies

brodyEMPLOYEE

3 months ago

Hello,

Yep, bun is picked up when there is a bun lock file, and only a bun lock file.

I don't know the syntax to add bun to Railpack yet, only the creator would at this time.

But you can add it to nixpacks with this nixpacks.toml file -

[phases.setup]

nixPkgs = ['...', 'bun']

Let me know if this works!

Best,
Brody

Status changed to Awaiting User Response railway[bot] • 3 months ago

brody

Hello,Yep, bun is picked up when there is a bun lock file, and only a bun lock file.I don't know the syntax to add bun to Railpack yet, only the creator would at this time.But you can add it to nixpacks with this nixpacks.toml file -[phases.setup] nixPkgs = ['...', 'bun']Let me know if this works!Best,Brody

neallPRO

3 months ago

Thanks! If I only want it installed during build for my bun application (and not for the node.js apps), this should be in the application's root, not the monorepo root - right? Is the recommended approach to use an environment variable in the bun service that points to the nixpacks.toml?

Also, any thoughts on installing via pre-deploy hook command for the service?

Status changed to Awaiting Railway Response railway[bot] • 3 months ago

brodyEMPLOYEE

3 months ago

Yep, you would likely want to store that file within a subdirectory and point to it with NIXPACKS_CONFIG_FILE

> any thoughts on installing via pre-deploy hook command for the service?

That wouldn't work, and it's not what it's designed for, the pre-deploy command is run in a separate container than the container that runs your application, so there is no shared file system.

Status changed to Awaiting User Response railway[bot] • 3 months ago

neallPRO

3 months ago

This worked! Only issue is I can't specify a newer Bun version - any tips?

Status changed to Awaiting Railway Response railway[bot] • 3 months ago

brodyEMPLOYEE

3 months ago

Nixpacks doesn't even support the latest bun version unfortunately.

That kind of issue is why we needed to build a better builder -

https://blog.railway.com/p/introducing-railpack

Status changed to Awaiting User Response railway[bot] • 3 months ago