Angular · Middle · Question 70 of 75

What does `toSignal(obs$, { initialValue: [] })` change compared to `toSignal(obs$)`?

✓Correct answer: The signal starts with [] instead of undefined, so its type doesn't include undefined
2It makes the Observable hot
3It unsubscribes after the first value

Explanation

For Observables that emit synchronously (like a BehaviorSubject), requireSync: true removes undefined without an initial value.

Further reading

Angular: RxJS interop with signals ↗

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