It seems that this package still has the assumption of the old worker format (e.g. global environment variables, FetchEvent, etc) and does not work properly with the new ES6 module format. I would like to use Durable Objects, which requires the new ES6 module format, in a Workers Site project, and wrangler already has a patchset for Workers Site support with the new ES6 module format, and the fact that this package does not support the new format seems to be the last blocker.