How to use the command 'yarn-why' (with examples)

The command ‘yarn-why’ is a useful tool for identifying why a specific Yarn package has been installed in your project. By providing the package name as an argument, you can quickly determine the reasons behind its installation.

Use case 1: Show why a Yarn package is installed

Code:

yarn-why package

Motivation: Understanding why a Yarn package is installed can help in troubleshooting issues, determining dependencies, or identifying potential vulnerabilities. By using the ‘yarn-why’ command, you can easily examine the reasons for a package’s presence in your project.

Explanation:

• yarn-why: The command itself initiates the analysis of package installation.
• package: The name of the Yarn package for which you want to identify the reasons for installation.

Example Output:

Analysis result for package 'lodash':

Details:
  - Dependency: Some other package depends on 'lodash'.

Inference:
  - The installation of 'lodash' is a result of a direct or indirect dependency.

In this example, when running yarn-why lodash, the output reveals that the installation of the ’lodash’ package is due to it being a dependency of another package in the project. This information helps in understanding the reasons behind the package installation and its impact on the project’s dependencies.