Netlify has announced full support for Yarn, a dependency manager for JavaScript projects, allowing users to leverage its speed, security, and reproducibility features. The support is enabled automatically upon deployment of sites with a `yarn.lock` file in the repository, without requiring any configuration changes. Users can also control Yarn behavior through environment variables, such as selecting a version or setting flags for automatic installation. This integration aims to improve dependency management and provide faster, more secure resolutions for users.