[okbake]

NGRX (the redux inspired state management library for angular) has a concept called 'effects', which lets you subscribe to the action stream (actions and the state in ngrx are both rxjs observables) and trigger side effects in response to certain actions. The effects themselves map to one or more actions (or zero if you want side-effects only) when they are finished that get dispatched.

Since you're dealing with them from within an observable stream you have access to all the rxjs operators, so you can do things like waiting for multiple actions to be dispatched before doing something, etc.