Third-Party Packages

Dagger Functions are just regular code, written in your usual programming language. One of the key advantages of this approach is that it opens up access to your language's existing ecosystem of packages or modules. You can easily import these packages/modules in your Dagger module via your language's package manager.

Go

To add a Go module, add it to your go.mod file using go get. For example:

go get github.com/spf13/cobra

Python

To add a Python package, add it to your pyproject.toml file using your chosen package manager. For example:

uv

uv add requests

poetry

poetry add requests

uv pip

Add the dependency manually to pyproject.toml:

[project]
dependencies = [
    "requirements>=2.32.3",
]

Then install into your virtual environment:

uv pip install -e ./sdk -e .

note

There's no need to activate the virtual environment before uv pip install, but it does need to exist.

pip

Add the dependency manually to pyproject.toml:

[project]
dependencies = [
    "requirements>=2.32.3",
]

Then install into your virtual environment:

python -m pip install -e ./sdk -e .

tip

If you haven't setup your local environment yet, see IDE Integration.

note

Third-party dependencies are managed in the same way as any normal Python project. The only limitation is in "pinning" the dependencies. Currently, Dagger can install directly from a uv.lock file, or a pip-tools compatible requirements.lock file (notice .lock extension, not .txt). See Language-native packaging for more information.

TypeScript

To add a TypeScript package, add it to the package.json file using your favorite package manager. For example:

npm install pm2

Pinning a specific dependency version or adding local dependencies are supported, in the same way as any Node.js project.