fix v8 6.6 (Node 10 and Chrome 66) Promise bug with resolving custom thenables

Author: zloirock

modules/es6.promise.js

@@ -13,10 +13,13 @@ var task = require('./_task').set;
 var microtask = require('./_microtask')();
 var newPromiseCapabilityModule = require('./_new-promise-capability');
 var perform = require('./_perform');
+var userAgent = require('./_user-agent');
 var promiseResolve = require('./_promise-resolve');
 var PROMISE = 'Promise';
 var TypeError = global.TypeError;
 var process = global.process;
+var versions = process && process.versions;
+var v8 = versions && versions.v8 || '';
 var $Promise = global[PROMISE];
 var isNode = classof(process) == 'process';
 var empty = function () { /* empty */ };
@@ -31,7 +34,13 @@ var USE_NATIVE = !!function () {
       exec(empty, empty);
     };
     // unhandled rejections tracking support, NodeJS Promise without it fails @@species test
-    return (isNode || typeof PromiseRejectionEvent == 'function') && promise.then(empty) instanceof FakePromise;
+    return (isNode || typeof PromiseRejectionEvent == 'function')
+      && promise.then(empty) instanceof FakePromise
+      // v8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables
+      // https://bugs.chromium.org/p/chromium/issues/detail?id=830565
+      // we can't detect it synchronously, so just check versions
+      && v8.indexOf('6.6') !== 0
+      && userAgent.indexOf('Chrome/66') === -1;
   } catch (e) { /* empty */ }
 }();