Function callbackTrampoline

lib/internal/async_hooks.js:119–139

(asyncId, resource, cb, ...args)

}

function callbackTrampoline(asyncId, resource, cb, ...args) {
  const index = async_hook_fields[kStackLength] - 1;
  execution_async_resources[index] = resource;

  if (asyncId !== 0 && hasHooks(kBefore))
    emitBeforeNative(asyncId);

  let result;
  if (asyncId === 0 && typeof domain_cb === 'function') {
    args.unshift(cb);
    result = ReflectApply(domain_cb, this, args);
  } else {
    result = ReflectApply(cb, this, args);
  }

  if (asyncId !== 0 && hasHooks(kAfter))
    emitAfterNative(asyncId);

  execution_async_resources.pop();
  return result;
}

const topLevelResource = {};