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Yarn is a fast, deterministic JavaScript package manager for Node.js projects. It provides offline caching, parallel installs and workspaces for monorepo support. Yarn emphasizes reproducible builds, performance and developer ergonomics; it supports Plug'n'Play and CI/CD integrations to ensure consistent dependency management across teams.
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Yarn is a package manager for JavaScript projects that resolves, installs, and reproducibly manages versioned dependencies.
Yarn began in 2016 at Facebook, Google, Exponent, and Tilde in response to reliability and speed problems in JavaScript package installation. The project made a lockfile and parallel installation central parts of its workflow.
A manifest describes dependencies. Yarn resolves their version ranges, records exact selections in a lockfile, and installs packages from a local cache or project directory.
A project requires an external package at a specified version.
It records the exact resolved versions.
Previously downloaded packages can be reused.
Yarn makes JavaScript dependencies reproducibly installable for teams and CI runs.
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