Variable: watch 
constwatch:StateAdapt["watch"]
Defined in: lib/watch.function.ts:33
watch wraps StateAdapt.watch for Angular.
watch returns a detached store (doesn't chain off of sources). This allows you to watch state without affecting anything. It takes 2 arguments: The path of the state you are interested in, and the adapter containing the selectors you want to use.
tsx
watch(path, adapter)path — Object path in Redux Devtools
adapter — Object with state change functions and selectors
Usage 
watch enables accessing state without subscribing to sources. For example, if your adapter manages the loading state for an HTTP request and you need to know if the request is loading before the user is interested in the data, watch can give you access to it without triggering the request.
Example: Accessing loading state 
tsx
watch('data', httpAdapter).loading$.subscribe(console.log);