What steps can I take to debug 'Cannot find module' errors when using module bundlers like Webpack or Parcel?

With module bundlers, ensure your bundler configuration (e.g., `webpack.config.js`) is correctly set up to resolve modules. Check `resolve.modules` and `resolve.extensions` settings. Also, verify that any necessary loaders or plugins are configured to handle different types of modules correctly. Ensure all dependencies are correctly specified in your `package.json`.