untracked<T> function

T untracked<T>(UntrackedCallback<T> callback)

In case when you're receiving a callback that can read some signals, but you don't want to subscribe to them, you can use untracked to prevent any subscriptions from happening.

final counter = signal(0);
final effectCount = signal(0);
final fn = () => effectCount.value + 1;

effect(() {
	print(counter.value);

	// Whenever this effect is triggered, run `fn` that gives new value
	effectCount.value = untracked(fn);
});

Implementation

T untracked<T>(UntrackedCallback<T> callback) {
  if (_untrackedDepth > 0) {
    return callback();
  }
  final prevContext = _evalContext;
  _evalContext = null;
  _untrackedDepth++;
  try {
    return callback();
  } finally {
    _untrackedDepth--;
    _evalContext = prevContext;
  }
}