Material UI Example Code Sandboxes are broken - missing dependency

Sorry for not following the standard bug filing template, but I just wanted to mention that the current Material UI example code sandboxes are broken.

Here's the error that I get when trying to run it: Could not find dependency:
`'tslib' relative to '/node_modules/mui-rff/dist/mui-rff.cjs.development.js'`

The fix is as easy as adding tslib as a dependency (which Code Sandbox gives a suggestion for in the error screen that is renderd). I hope this helps others.