use native check will always fail

[ishowshao]

var USE_NATIVE = !!function(){
  try {
    // correct subclassing with @@species support
    var promise     = $Promise.resolve(1)
      , FakePromise = (promise.constructor = {})[require('./_wks')('species')] = function(exec){ exec(empty, empty); };
    // unhandled rejections tracking support, NodeJS Promise without it fails @@species test
    return (isNode || typeof PromiseRejectionEvent == 'function') && promise.then(empty) instanceof FakePromise;
  } catch(e){ /* empty */ }
}();

this use native check will always fail because promise.then(empty) will throw error

so it will always use babel's Promise, but babel's Promise has bug in iOS9.3 webview, Promise.resolve not resolving when page scrolling

[zloirock]

Native check correctly fails because this promise implementation does not support @@species pattern and unhandled rejection tracking. If you have an issue with "babel's Promise bug in iOS9.3 webview" - please, open issue about it, add details and reproducible example.