Consider a Promise-style `then` & `catch`

[nevir]

It might be beneficial to make a breaking change to convert then's interface over to just emit the found entities, and have a separate catch callback, so that requests adhere to Promise's interface. This would allow easy interop with async/await

[8bitDesigner]

I totally agree, however my company no longer uses Target Process, so I don't have any way to build or test that change. If you want, however, I can make you a contributor on this project if you want to pick that task up.