deps/v8/src/js/promise.js
function Promise(executor) {
  if (executor === promiseRawSymbol) {
    return %_NewObject(GlobalPromise, new.target);
  }
  if (IS_UNDEFINED(new.target)) throw MakeTypeError(kNotAPromise, this);
  if (!IS_CALLABLE(executor)) {
    throw MakeTypeError(kResolverNotAFunction, executor);
  }

  var promise = PromiseInit(%_NewObject(GlobalPromise, new.target));
  var callbacks = CreateResolvingFunctions(promise);
  var debug_is_active = DEBUG_IS_ACTIVE;
  try {
    if (debug_is_active) %DebugPushPromise(promise, Promise);
    executor(callbacks.resolve, callbacks.reject);
  } catch (e) {
    %_Call(callbacks.reject, UNDEFINED, e);
  } finally {
    if (debug_is_active) %DebugPopPromise();
  }

  return promise;
}
function Promise(executor) {
  if (executor === promiseRawSymbol) {
    return %_NewObject(GlobalPromise, new.target);
  }
  if (IS_UNDEFINED(new.target)) throw MakeTypeError(kNotAPromise, this);
  if (!IS_CALLABLE(executor)) {
    throw MakeTypeError(kResolverNotAFunction, executor);
  }

  var promise = PromiseInit(%_NewObject(GlobalPromise, new.target));
  var callbacks = CreateResolvingFunctions(promise);
  var debug_is_active = DEBUG_IS_ACTIVE;
  try {
    if (debug_is_active) %DebugPushPromise(promise, Promise);
    executor(callbacks.resolve, callbacks.reject);
  } catch (e) {
    %_Call(callbacks.reject, UNDEFINED, e);
  } finally {
    if (debug_is_active) %DebugPopPromise();
  }

  return promise;
}
ES#sec-promise-executor Promise ( executor )