Function createLinkedSignal

packages/core/primitives/signals/src/linked_signal.ts:67–104

(
  sourceFn: () => S,
  computationFn: ComputationFn<S, D>,
  equalityFn?: ValueEqualityFn<D>,
)

};

export function createLinkedSignal<S, D>(
  sourceFn: () => S,
  computationFn: ComputationFn<S, D>,
  equalityFn?: ValueEqualityFn<D>,
): LinkedSignalGetter<S, D> {
  const node: LinkedSignalNode<S, D> = Object.create(LINKED_SIGNAL_NODE);

  node.source = sourceFn;
  node.computation = computationFn;
  if (equalityFn != undefined) {
    node.equal = equalityFn;
  }

  const linkedSignalGetter = () => {
    // Check if the value needs updating before returning it.
    producerUpdateValueVersion(node);

    // Record that someone looked at this signal.
    producerAccessed(node);

    if (node.value === ERRORED) {
      throw node.error;
    }

    return node.value;
  };

  const getter = linkedSignalGetter as LinkedSignalGetter<S, D>;
  getter[SIGNAL] = node;
  if (typeof ngDevMode !== 'undefined' && ngDevMode) {
    getter.toString = () =>
      `[LinkedSignal${node.debugName ? ' (' + node.debugName + ')' : ''}: ${String(node.value)}]`;
  }

  runPostProducerCreatedFn(node);

  return getter;
}

export function linkedSignalSetFn<S, D>(node: LinkedSignalNode<S, D>, newValue: D) {
  producerUpdateValueVersion(node);