Class Notifier<T>

A Notifier is something that can notify subscribed parties of a change. If the notifier represents a value that has meaning outside of updates, look at ValueNotifier.

If relevant, the following pattern can be used to only expose the subscribe function:

class Foo {
  #notifier: Notifier<number> = new Notifier()
   get notifier(): Observable<number> {
       return this.#notifier
   }
}
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or

class Test {
   readonly #notifier: Notifier<number> = new Notifier()
   readonly observer = this.#notifier as Observable<number>
}
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