Handling global application state using Signals

To convert your state management solution so that it uses Signals instead of RxJS, you must change the BehaviorSubject classes in the ExpensesStore to Signals. You still want to ensure that the state only emits a new value when it’s set in the store; you don’t want to be able to set the state outside of the store.

To achieve this, we will create a private WritableSignal and a public Signal that is read-only. You can change all the BehaviorSubject classes to Signals using the following syntax:

private expensesState = signal<ExpenseModel[]>([]);
expenses = this.expensesState as Signal<ExpenseModel[]>;

Here, we declared a private Signal using the signal() function. Declaring a Signal in this manner will create WritableSignal. In the line after, we created a public property and assigned it with WritableSignal but cast it to a Signal type with the as keyword; here, the Signal type is read-only. After adjusting...