Class ValueNotifier<T>

A value to which observers can subscribe to, which will then be notified whenever the value changes. If relevant, the following pattern can be used to only expose the subscribe function:

class Foo {
  #notifier: ValueNotifier<number> = new ValueNotifier(0)
   get notifier(): ObservableValue<number> {
       return this.#notifier
   }
}
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or

class Test {
   readonly #notifier: ValueNotifier<number> = new ValueNotifier(0)
   readonly observer = this.#notifier as ObservableValue<number>
}
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