Function shouldAttachTrigger

packages/core/src/defer/triggering.ts:591–599

(triggerType: TriggerType, lView: LView, tNode: TNode)

 * to ensure the proper triggers for a given type are used.
 */
export function shouldAttachTrigger(triggerType: TriggerType, lView: LView, tNode: TNode): boolean {
  if (triggerType === TriggerType.Regular) {
    return shouldAttachRegularTrigger(lView, tNode);
  } else if (triggerType === TriggerType.Hydrate) {
    return !shouldAttachRegularTrigger(lView, tNode);
  }
  // TriggerType.Prefetch is active only on the client
  return !(typeof ngServerMode !== 'undefined' && ngServerMode);
}

/** Whether a given defer block has `hydrate` triggers. */
export function hasHydrateTriggers(flags: TDeferDetailsFlags | null | undefined): boolean {