fails to resolve toDate if [email protected] is used elsewhere in project
It appears [email protected] is no longer listed in peerDependencies, so when this is used in a project that has other things that depend on [email protected], it fails to load with the error:

since [email protected] doesn't have toDate.
Listing as peer dependency does not help with missing functions. I think you have to pin a version prior to 1.0.0 to use with date-fns v1
@kurkle maybe we need dependencies rather than peerDependencies. this package certainly requires [email protected] so shouldn't there be a dependency declared in package.json? since there is no declared dependency it seems to be resolving the older version (even though both versions are available) and failing.
adding the dependency will make yarn/npm populate a siloed node_modules tree within the installed code and everything should work.
https://github.com/chartjs/chartjs-adapter-date-fns/pull/39 would solve this