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sidebar_label: yarn
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# dagger.io/js/yarn

Yarn is a package manager for Javascript applications

## #Package

A Yarn package.

### #Package Inputs

| Name             | Type                    | Description                                                                           |
| -------------    |:-------------:          |:-------------:                                                                        |
|*source*          | `dagger.#Artifact`      |Application source code                                                                |
|*package*         | `struct`                |Extra alpine packages to install                                                       |
|*cwd*             | `*"." \| string`        |working directory to use                                                               |
|*env*             | `struct`                |Environment variables                                                                  |
|*writeEnvFile*    | `*"" \| string`         |Write the contents of `environment` to this file, in the "envfile" format.             |
|*buildDir*        | `*"build" \| string`    |Read build output from this directory (path must be relative to working directory).    |
|*script*          | `*"build" \| string`    |Run this yarn script                                                                   |
|*args*            | `*[] \| []`             |Optional arguments for the script                                                      |

### #Package Outputs

| Name             | Type              | Description        |
| -------------    |:-------------:    |:-------------:     |
|*build*           | `struct`          |-                   |