Function ɵɵdeferPrefetchOnHover

packages/core/src/defer/instructions.ts:603–631

(triggerIndex: number, walkUpTimes?: number)

 * @codeGenApi
 */
export function ɵɵdeferPrefetchOnHover(triggerIndex: number, walkUpTimes?: number) {
  const lView = getLView();
  const tNode = getCurrentTNode()!;

  if (ngDevMode) {
    trackTriggerForDebugging(
      lView[TVIEW],
      tNode,
      `prefetch on hover${walkUpTimes === -1 ? '' : '(<target>)'}`,
    );
  }

  if (!shouldAttachTrigger(TriggerType.Prefetch, lView, tNode)) return;

  const tView = lView[TVIEW];
  const tDetails = getTDeferBlockDetails(tView, tNode);

  if (tDetails.loadingState === DeferDependenciesLoadingState.NOT_STARTED) {
    registerDomTrigger(
      lView,
      tNode,
      triggerIndex,
      walkUpTimes,
      onHover,
      () => triggerPrefetching(tDetails, lView, tNode),
      TriggerType.Prefetch,
    );
  }
}

/**
 * Creates runtime data structures for the `on hover` hydrate trigger.