AK0031

Signal set() called during computation

What happened

You called .set() on a signal while inside a computed() callback or during an effect's tracking phase. Writing to signals during computation can cause infinite re-evaluations.

How to fix

Move signal writes to event handlers, onMount(), or wrap them in batch() to defer the update.

Example

// Bad — writing a signal inside computed()
const count = signal(0);
const doubled = computed(() => {
  count.set(count() * 2); // writing during computation!
  return count();
});

// Good — derive values without side effects
const count = signal(0);
const doubled = computed(() => count() * 2);

// Good — write signals in event handlers
function handleClick() {
  batch(() => {
    count.set(count() + 1);
  });
}