Can I use external libraries?

Definitely! Don't worry about a limit, you can use as many as you want as long as they’re adding value. You can use dependencies to manage behaviors outside the scope of MUI's open-source projects (drag and drop, virtualization, forms, etc.).

However, we discourage replacing existing functionality (tooltips, modals, sliders, charts, data grids, etc.). 

Please make sure the license of the external library you're adding to your item is compatible with the MUI Store license or that any restrictions are documented so buyers know what they're getting.