What are the main functions of yarn?

Yarn has several main functions:

1. Dependency management: Yarn is able to handle all the dependencies needed for a project, including third-party libraries and frameworks. It can download, install, and update dependencies while ensuring their versions and compatibility.
2. Parallel installation: Yarn improves performance by installing dependencies in parallel. It downloads multiple packages at once, speeding up the installation process and reducing project build time.
3. Locking files: Yarn will generate a yarn.lock file to lock the dependency versions of the project. This ensures consistency in the dependency versions used when building the project in different environments, avoiding issues caused by inconsistent dependency versions.
4. Script execution: Yarn can execute script commands in the project, such as building, testing, and deploying. It provides some built-in commands and also allows for custom script commands.
5. Local caching: Yarn caches downloaded dependencies locally, allowing for installation and builds to be done without an internet connection. It can also be configured to use the cache to improve performance of repeated builds.
6. Reliability and stability: Yarn has been extensively tested and used, demonstrating excellent stability and reliability. It can run on different operating systems and environments, and is compatible with npm, allowing for seamless migration of existing npm projects.