Function producerAddLiveConsumer

packages/core/primitives/signals/src/graph.ts:523–544

* Add `consumer` as a live consumer of this node. * * Note that this operation is potentially transitive. If this node becomes live, then it becomes * a live consumer of all of its current producers.

(node: ReactiveNode, link: ReactiveLink)

 * a live consumer of all of its current producers.
 */
function producerAddLiveConsumer(node: ReactiveNode, link: ReactiveLink): void {
  const consumersTail = node.consumersTail;
  const wasLive = consumerIsLive(node);
  if (consumersTail !== undefined) {
    link.nextConsumer = consumersTail.nextConsumer;
    consumersTail.nextConsumer = link;
  } else {
    link.nextConsumer = undefined;
    node.consumers = link;
  }
  link.prevConsumer = consumersTail;
  node.consumersTail = link;
  if (!wasLive) {
    for (
      let link: ReactiveLink | undefined = node.producers;
      link !== undefined;
      link = link.nextProducer
    ) {
      producerAddLiveConsumer(link.producer, link);
    }
  }
}

function producerRemoveLiveConsumerLink(link: ReactiveLink): ReactiveLink | undefined {
  const producer = link.producer;