404 on all routes when using express-promise-router

I tried to follow the docs in the readme. It looks like the types have changed so that you no longer need the import * as, but even when I change that I get 404s on all routes that are working just fine with the default router.

Is there an easy way to debug what's happening so I can figure out whether the issue is how Overnight is setting up the router, or if instead it's an express-promise-router problem?