request: pub workspaces

[lishaduck]

Is there an existing feature request for this?

• I have searched the existing issues.

Command

No response

Description

Once Pub Workspaces land in stable, it would be great if Melos replaced dependency_overrides generation in favor of Pub Workspaces.
I believe this is planned, but I didn't see an issue.

Reasoning

Pub Workspaces enable a single analyzer scope, which both improves performance and reduces the maintenance burden on the Melos team.

Additional context and comments

Thanks for melos! It works great!

[spydon]

It is indeed planned, thanks for opening an issue so that we can track it!
I'll link in the Flutter design doc for it is here too: https://flutter.dev/go/pub-workspace

[spydon]

Related: dart-lang/pub#4376

[spydon]

Related (globbing in workspace definition, which would make future migrations easier): dart-lang/pub#4391

[Leptopoda]

I can see how globs are nice to have for this use case, but I wouldn't consider it a blocker.
I've migrated some repos to workspaces by using melos list -rp.

I'd love to use melos + workspaces sooner rather than waiting for this that isn't even such a big inconvenience.

[spydon]

@Leptopoda I agree, it's not a blocker, possibly we could even write a simple migration script for it.

[xaethos]

Do Melos and Pub workspaces work together right now? Has anybody gotten a repo migrated by hand?

A few weeks back I took a stab at migrating a repo and couldn't get everything to work. I cannot remember for sure, but I think my blocker ultimately was the Flutter toolchain not handling Pub workspaces, though believe some Melos commands were confused by the dep overrides being elsewhere.

Is there a sense of what needs to be done for Melos and Pub workspaces to coexist?

[spydon]

@xaethos it shouldn't be a problem for them to co-exist already afaik. With the workspaces we can simplify a lot of our code in Melos and remove the packages config from melos.yaml though, and that needs some work.

[Leptopoda]

What I have done so far:

• remove dep overrides
• add every package to the workspace in the root pubspec
• change the dependency resolution for every package to "workspace"

Et voilà.
You MUST NOT use melos bootstrap as it will try to generate the overrides again. I suggest to just use dart pub get and melos for all the other commands (format, run scripts, publish, ...).

The current stable flutter version is broken for workspaces and last time I checked master it was also not working. I found 3.26.0-0.1.preto be working in some testing (just specify it in fvm) although your use case might forbid unreleased versions. A stable release should be right around the corner.

[SAGARSURI]

finally workspace is released to stable version 3.27:

https://dart.dev/tools/pub/workspaces

[SAGARSURI]

I hope melos bootstrap will not be removed but tweaked to handle the new workspace changes.

• This way we can still use hooks pre/post bootstrap command execution.
• Also the variable MELOS_PACKAGES might get effected which we use it in our pipeline to run test on changed packages because of this problem fix: melos overrides the applied filter for dependents/dependencies #675