packemon: regeneratorRuntime is not defined in build output

Attempting packemon for a project. Its building the project fast without errors. But the output contains references to regeneratorRuntime which is not in scope. Checking this SO question it says the @babel/plugin-transform-runtime plugin should be used… but I am not sure how to add that as packemon uses its internal babel configuration? Is there a way to extend it / add a plugin for it?

You can reproduce it by cloning the fix-web-api-issues branch here. Running node lib/bin.js should not throw.

Thanks 😁