subscribeToNode method

@override void subscribeToNode(Node node)

Implementation

@override
void subscribeToNode(Node node) {
  if (targets == null) {
    flags |= OUTDATED | TRACKING;

    // A computed signal subscribes lazily to its dependencies when it
    // gets its first subscriber.
    for (var node = sources; node != null; node = node.nextSource) {
      node.source.subscribeToNode(node);
    }
  }
  internalSubscribe(node);
}