PyPI extras not working in features

[DerWeh]

Checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pixi, using pixi --version.

Reproducible example

Commands I ran and their output:

$ pixi init
$ pixi add python dash
$ pixi add --feature tests pytest
$ pixi workspace environment add tests --feature tests
$ pixi add --feature tests --pypi "dash[testing]"

pixi.toml/pyproject.toml file that reproduces my issue:

[workspace]
channels = ["conda-forge"]
name = "temp"
platforms = ["linux-64"]

[tasks]

[dependencies]
python = ">=3.14.5,<3.15"
dash = ">=4.2.0,<5"

[feature.tests.dependencies]
pytest = "*"

[feature.tests.pypi-dependencies]
dash = { version = "*", extras = ["testing"] }

[environments]
tests = ["tests"]

pixi info output:

System
------------
       Pixi version: 0.70.2
        TLS backend: rustls
           Platform: linux-64
   Virtual packages: __unix=0=0
                   : __linux=6.6.114.1=0
                   : __glibc=2.39=0
                   : __archspec=1=ivybridge
          Cache dir: /home/andreas/.cache/rattler/cache
       Auth storage: /home/andreas/.rattler/credentials.json
   Config locations: No config files found

Global
------------
            Bin dir: /home/andreas/.pixi/bin
    Environment dir: /home/andreas/.pixi/envs
       Manifest dir: /home/andreas/.pixi/manifests/pixi-global.toml

Workspace
------------
               Name: workspace
            Version: 0.1.0
      Manifest file: /home/andreas/workspace/pixi.toml
       Last updated: 11-06-2026 23:19:48

Environments
------------
        Environment: default
           Features: default
           Channels: conda-forge
   Dependency count: 2
       Dependencies: python, dash
   Target platforms: linux-64
    Prefix location: /home/andreas/workspace/.pixi/envs/default

        Environment: tests
           Features: tests, default
           Channels: conda-forge
   Dependency count: 3
       Dependencies: pytest, python, dash
  PyPI Dependencies: dash
   Target platforms: linux-64
    Prefix location: /home/andreas/workspace/.pixi/envs/tests

Other files (e.g. script files, source files, etc.):

Issue description

Trying to add dash[testing] produces the warning

WARN The package dash==4.2.0 does not have an extra named testing

Expected behavior

pixi uses the testing extra dependencies of dash to the tests feature.
When using no features, it seems to work:

$ pixi init
$ pixi add python
$ pixi add --pypi "dash[testing]"

[workspace]
channels = ["conda-forge"]
name = "temp"
platforms = ["linux-64"]

[tasks]

[dependencies]
python = ">=3.14.5,<3.15"

[pypi-dependencies]
dash = { version = ">=4.2.0, <5", extras = ["testing"] }

[ruben-arts]

Your using tests in the feature and testing in the normal dependencies. Can this just be a typo?

[DerWeh]

Sorry @ruben-arts, as usually while distilling a minimal reproducible example I fucked things up. I corrected the example.

[baszalmstra]

The reason is that you added dash as a conda package through [dependencies]. Because the package is already installed through conda the pypi requirement is already fulfilled and it won't be installed from pypi. Conda packages dont provide extras (yet).

The reason it works in your other example is that you have only listed dash in pypi-dependencies. Since there is no conda package providing dash its downloaded from pypi.

[DerWeh]

Thanks for the clarification, the error message was a bit misleading, but it seems like a tough edge case.

Ideally, dependencies in the extra are looked up on PyPI and translated via parselmouth back to conda packages (or even better: conda packages handle this natively).

For now, I can either 1. Add the extra dependencies by hand, or 2. use the PyPI wheel for dash instead.

Is there a simple way to improve at least the error message? Or prevent the user from having dash as a (conda) dependency and dash[testing] as a PyPI-dependency?
If I understand you correctly @baszalmstra this is currently not possible.