A minimal observable of state changes. For more information, see the observable proposal: https://github.com/tc39/proposal-observable
The minimal observable subscription method.
Any object that can be used as an observer. The observer object should have a next method.
next
An object with an unsubscribe method that can be used to unsubscribe the observable from the store, and prevent further emission of values from the observable.
unsubscribe
A minimal observable of state changes. For more information, see the observable proposal: https://github.com/tc39/proposal-observable