Fast, reliable, and secure dependency management.
Yarn is a modern package manager split into various packages. Its novel architecture allows to do things currently impossible with existing solutions:
- Yarn supports plugins; adding a plugin is as simple as adding it into your repository
- Yarn supports Node by default but isn't limited to it - plugins can add support for other languages
- Yarn supports workspaces natively, and its CLI takes advantage of that
- Yarn uses a bash-like portable shell to execute package scripts, guaranteeing they work the same way on Windows, Linux, and macOS
- Yarn is first and foremost a Node API that can be used programmatically (via @yarnpkg/core)
- Yarn is written in TypeScript and is fully type-checked
We wish to thank the following companies for their support:
|Datadog has been sponsoring the time from our lead maintainer for more than a year now. They also upgraded our account so that we can benefit from long-term telemetry (RFC).|
|Sysgears also sponsored time from very early in the 2.x development. In particular, their strong investment is the reason why Yarn 2 supports node_modules installs even better than it used to.|
|Netlify has been the historical provider for our website. Each time we got issues, they jumped to our help. Their live previews have been super helpful in our development process.|
|Cloudflare has also been an historical partner. While we don't directly mirror the npm registry anymore, they still power our website to make its delivery as fast as possible.|
|Algolia contributed a lot to our documentation over the years. They still power the search engine we use on both versions of the documentation.|
Consult the Installation Guide.
Consult the Migration Guide.
The documentation can be found at yarnpkg.com.
The API documentation can be found at yarnpkg.com/api.
On top of our classic integration tests, we also run Yarn every day against the latest versions of the toolchains used by our community - just in case. Everything should be green!
Consult the Contributing Guide.
Building your own bundle
Clone this repository, then run the following commands:
How it works
After building the CLI your global
yarn will immediately start to reflect your local changes. This is because Yarn will pick up the
yarnPath settings in this repository's
.yarnrc.yml, which is configured to use the newly built CLI if available.
Works out of the box!
Note that no other command is needed! Given that our dependencies are checked-in within the repository (within the
.yarn/cache directory), you don't even need to run
yarn install. Everything just works right after cloning the project and is guaranteed to continue to work ten years from now
Those plugins typically come bundled with Yarn. You don't need to do anything special to use them.
- ★ plugin-compat contains various built-in patches that will be applied to packages that aren't compatible with the Plug'n'Play resolution out-of-the-box.
- ★ plugin-dlx adds support for the
- ★ plugin-essentials adds various commands deemed necessary for a package manager (add, remove, ...).
- ★ plugin-file adds support for using the
file:protocol within your dependencies.
- ★ plugin-git adds support for cloning packages from Git repositories.
- ★ plugin-github adds support for using GitHub references as dependencies. This plugin doesn't use git.
- ★ plugin-http adds support for using straight URL references as dependencies (tgz archives only).
- ★ plugin-init adds support for the
- ★ plugin-link adds support for using
portal:references as dependencies.
- ★ plugin-node-modules adds support for installing packages through a
- ★ plugin-npm adds support for using semver ranges as dependencies, resolving them to an NPM-like registry.
- ★ plugin-npm-cli adds support for the NPM-specific commands (
yarn npm info,
yarn npm login,
yarn npm publish, ...).
- ★ plugin-pack adds support for the
- ★ plugin-patch adds support for the
Although developed on the same repository as Yarn itself, those plugins are optional and need to be explicitly installed through
yarn plugin import @yarnpkg/<plugin-name>.
- ☆ plugin-constraints adds support for constraints to Yarn.
- ☆ plugin-exec adds support for using the
exec:protocol within your dependencies.
- ☆ plugin-interactive-tools adds support for various interactive commands (
- ☆ plugin-stage adds support for the
- ☆ plugin-typescript improves the user experience when working with TypeScript.
- ☆ plugin-version adds support for the new release workflow.
- ☆ plugin-workspace-tools adds support for the
yarn workspaces foreachcommand.
Plugins can be developed by third-party entities. To use them within your applications, just specify the full plugin URL when calling
Creating a new plugin
To create your own plugin, please refer to the documentation.
The following packages are generic and can be used in a variety of purposes (including to implement other package managers, but not only):
- @yarnpkg/core allows any application to manipulate a project programmatically.
- @yarnpkg/fslib is a set of tools to abstract the filesystem through type-safe primitives.
- @yarnpkg/json-proxy allows to temporarily convert any POD object to an immutable object.
- @yarnpkg/libzip contains zlib+libzip bindings compiled to WebAssembly.
- @yarnpkg/parsers can be used to parse the language used by @yarnpkg/shell.
- @yarnpkg/pnp can be used to generate Plug'n'Play-compatible hooks.
- @yarnpkg/pnpify is a CLI tool to transparently add PnP support to various tools.
- @yarnpkg/shell is a portable bash-like shell interpreter.
The following packages are meant to be used by Yarn itself, and probably won't be useful to other applications: