How to Debug npm Modules with Yarn?

When using Yarn to manage npm modules, if you need to debug a specific module, you can follow these steps:

1. Local Linking of Modules: First, if you modify an npm module and want to see the changes reflected in real-time, run yarn link in the module's directory. This creates a global link. Then, in your project directory, run yarn link [module name] to associate this link with your local project.

2. View Detailed Logs: When running Yarn commands, add the --verbose flag to print more detailed output, helping you understand the detailed execution process and status of the command.

3. Use Debugging Tools: For modules running in a Node.js environment, you can use Node's built-in debugging tools, such as node --inspect or node --inspect-brk, along with Chrome DevTools for breakpoint debugging of the source code.

4. Analyze Dependency Tree: Use the yarn why [module name] command to analyze why a module was installed, its dependency sources, and version information.

5. Environment Variables: You can leverage environment variables to control and debug the behavior of npm modules. For example, setting NODE_ENV=development can enable development mode for certain modules, which may output more debugging information or enable additional features.

By following these steps, you can effectively debug and manage npm modules installed via Yarn.