express-saga is a web framework based on express and the saga pattern (redux-saga's interpretation).
You can use all existing express middleware without issue, but often there are better alternatives in express-saga.
Most effects from redux-saga are available, along with new effects for web server development.
This library is designed with a heavy focus on unit-testability. You don't need module level mocks due to dependency injection. Your routers are pure functions, so you don't need to run a http server in tests.