why Verified current stable Not installed? Package Management

Why / List Module Dependencies

List Module Dependencies

Lists all dependencies of a specific module using Yarn.

$
Terminal
yarn why <module_name>

When To Use

To audit package versions and dependency trees for security compliance.

Pro Tip

Consider using the --prod flag to filter only production dependencies, reducing clutter in output.

Command Builder

Tune the command before you copy it

Back to syntax
$
Generated Command
yarn why <module_name>

Anatomy of Output

Understanding the result

Dependency tree for {{module_name}}: Module Dependency Overview

Shows the tree structure of all dependencies for the specified module.

├─┬ express@4.17.1 Direct Dependency

The installed version of express, a direct dependency of the module.

│ ├── body-parser@1.19.0 Sub-dependency

Indicates a sub-module, required for express functionality.

│ └── multer@1.4.2 Another Sub-dependency

Another dependent library utilized by express.

Troubleshooting

Common pitfalls

Error: Module not found

Solution: Ensure the correct module name is provided.

Error: No dependencies found

Solution: Check if the module is installed correctly.

Error: Invalid command syntax

Solution: Verify the command format and try again.

Command Breakdown

What each part is doing

yarn
Base Command
The executable that performs this operation. Here it runs Why before the shell applies any redirect operators.
<module_name>
module name
The value supplied for module name.

Alternative Approaches

Comparable commands in other tools

Alternative package management tools for the same job.