How can I return a reference to a subject from a service without allowing the receiver to call .next() on the subject?
Let's say there is a service with a subject that triggers new events.
class ExampleService {
private exampleSubject = new Subject<boolean>;
// Method to trigger next on the subject
doNext() {
this.exampleSubject.next(true);
}
getSubject() {
// Return reference to the subject for subscribing only, not modifying
return this.exampleSubject;
}
}
I want other components to be able to subscribe and listen for changes but prevent them from making changes to the subject directly.
ExampleService.getSubject().subscribe(() => {
//do something
}) // allowed
ExampleService.getSubject().next(true) // not allowed/error