It always bugged me that there is nothing in native css or otherwise easy way to detect when something overflows, so you could adjust styling or content.
So I build this small tool that fixes it: OverflowGuard
It's especially useful when dealing with dynamic content in toolbars. Something even some big sites don't solve 100% (some examples in this post)

Most apps and sites just use fixed media or container query break-points, or some custom components / js for their specific case.
This tool, by simply detecting overflow, unlocks building responsive components in a much more fluid way, and allows doing much more then just flex-wrap..