[Solved] After migrating from observable to signal, this code throws an error:const data = signal(null); this.data$.subscribe(value => data.set(value));What is the issue? | Angular

Angular - Signals

After migrating from observable to signal, this code throws an error:

const data = signal(null);

this.data$.subscribe(value => data.set(value));

What is the issue?

AYou must use <code>update()</code> instead of <code>set()</code>.

BMixing observable subscription with signal defeats signal benefits.

CThe initial value of signal cannot be null.

DSignals cannot be set inside subscriptions.

Step-by-Step Solution

Solution:

Step 1: Identify mixing patterns
Subscribing to observable and setting signal manually mixes reactive patterns.
Step 2: Understand signal migration goal
Signals replace subscriptions by providing synchronous reactive values.
Final Answer:
Mixing observable subscription with signal defeats signal benefits. -> Option B
Quick Check:
Avoid mixing observables and signals = D [OK]

Quick Trick: Avoid subscribing to observables when using signals [OK]

Common Mistakes:

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