Yarn

Definitions

1. A JavaScript package manager created by Facebook as an alternative to npm, introducing deterministic installs via a lockfile (yarn.lock), offline caching, and workspaces for monorepo support. Yarn 2+ (Berry) further introduced Plug'n'Play, which eliminates node_modules entirely.

   In plain English: A tool that downloads and manages the third-party code libraries a JavaScript project depends on.

   Example: "Run yarn install and make sure you commit the yarn.lock — we don't want non-deterministic builds."

Related Terms

• TypeScript
• Webpack
• npm
• JavaScript Runtime
• Node Module
• NPM Registry
• Pnpm
• Require
• V8 Engine