The error message "Cannot read properties of undefined (reading 'button')" is likely occurring because the property 'button' is not defined or is not being accessed correctly in your code. This could be due to a typo in the property name, an incorrect reference, or the property not being properly initialized.
To improve your UI library for local use in various projects, you can consider the following steps:
1. Ensure that all dependencies are properly installed and configured in your project.
2. Double-check the import statements in your code to make sure that all components and styles are being imported correctly.
3. Use explicit type annotations in your TypeScript code to avoid undefined errors and improve type safety.
4. Use CSS Modules to scope styles locally and avoid naming conflicts.
5. Test your UI library in different project setups to ensure compatibility with different configurations.
6. Provide clear documentation and examples for using your UI library in different projects.
If the error "Cannot read properties of undefined (reading 'button')" specifically occurs when trying to access the class '.button' using cva, you may need to check the configuration of cva and ensure that the class 'button' is defined correctly in your CSS files. Additionally, make sure that cva is properly initialized and configured in your webpack setup.
By following these steps and debugging your code, you should be able to improve your UI library for local use in various projects and resolve the error message you are encountering.