use promise polyfill

index.js

@@ -1,5 +1,6 @@
 "use strict"
 
+var Promise = require("./promise/promise")
 var m = require("./render/hyperscript")
 var renderService = require("./render/render")(window)
 var redrawService = require("./api/pubsub")()

promise/promise.js

@@ -1,8 +1,9 @@
 "use strict"
-{
-function Promise(executor) {
+
+if (typeof Promise === "undefined") {
+	var Promise = function(executor) {
 		if (!(this instanceof Promise)) throw new Error("Promise must be called with `new`")
-	if (typeof executor !== "function") throw new Error("executor must be a function")
+		if (typeof executor !== "function") throw new TypeError("executor must be a function")
 		
 		var self = this, resolvers = [], rejectors = [], resolveCurrent = handler(resolvers, true), rejectCurrent = handler(rejectors, false)
 		var instance = self._instance = {resolvers: resolvers, rejectors: rejectors}
@@ -93,6 +94,5 @@ Promise.race = function(list) {
 			}
 		})
 	}
-
-module.exports = Promise
 }
+module.exports = Promise