Function trackPromise

lib/internal/async_hooks.js:315–327

(promise, parent)

}

function trackPromise(promise, parent) {
  if (promise[async_id_symbol]) {
    return;
  }

  // Get trigger id from parent async id before making the async id of the
  // child so if a new one must be made it will be lower than the child.
  const triggerAsyncId = parent ? getOrSetAsyncId(parent) :
    getDefaultTriggerAsyncId();

  promise[async_id_symbol] = newAsyncId();
  promise[trigger_async_id_symbol] = triggerAsyncId;
}

function promiseInitHook(promise, parent) {
  trackPromise(promise, parent);