List Signal

A ListSignal is a special signal that can be used to represent a list of values.

When you modify any element on the list, the ListSignal will automatically notify its observers.

final items = ListSignal([1, 2]);

items.observe((previousValue, value) {
  print("Items changed: $previousValue -> $value");
});

items.add(3); // prints "Items changed: [1, 2] -> [1, 2, 3]"
items[0] = 10; // prints "Items changed: [1, 2, 3] -> [10, 2, 3]"