Commands Yarn

yarn

Yarn is a package manager for JavaScript, similar to npm. It was developed by Facebook to address some of the shortcomings of npm at the time. Yarn introduced several features to improve performance, reliability, and security when managing dependencies.

Note: Both npm (package-lock.json) and Yarn (yarn.lock) use a lockfile to ensure consistency across different environments.

# Initialize a project
yarn init
 
yarn # npm install
# or 
yarn install
 
yarn add package-name # add -> install
 
yarn add package-name@version
 
yarn add package-name --dev # --dev -> --save-dev
 
yarn global add package-name # global add -> install -g
 
yarn upgrade # upgrade -> update
 
yarn upgrade package-name 
 
yarn remove package-name # remove -> uninstall
 
yarn list
 
yarn outdated
 
yarn run script-name
 
yarn install --frozen- lockfile # install --frozen- lockfile -> ci

Key Benefits of Yarn

1. Speed: Yarn installs packages faster due to caching and parallel downloads. It reuses downloaded packages in subsequent installs.
2. Consistency: Yarn uses a yarn.lock file to ensure consistent dependency versions across all environments.
3. Security: Yarn verifies package integrity using checksums to ensure no tampering has occurred.
4. Offline Mode: Yarn can install previously installed packages without an internet connection, using its cache.
5. Better Dependency Resolution: Yarn avoids "dependency hell" by ensuring predictable dependency trees.
6. Workspaces: Yarn has built-in support for managing monorepos, making it easier to work with multiple projects in one repository.

Which to Choose?

• Yarn: Choose if you need speed, better dependency management, or monorepo support.
• npm: Choose if you prefer simplicity or the latest npm features (like workspaces and performance improvements).