Ha, I found a interesting case with global-exports: React-transition-group docs recommend using e.g. require("react-transition-group/TransitionGroup"), but the index.js from the package also export this component

Looks like this doesn't currently work, but probably should:

{react-transition-group ReactTransitionGroup
 "react-transition-group/TransitionGroup" ReactTransitionGroup.TransitionGroup
 "react-transition-group/CSSTransitionGroup" ReactTransitionGroup.CSSTransitionGroup}

My mistake, this case works (using symbols) but I forgot to add these names to :provides