From 8c7a81d31702c2aaf3dcd64c9f57c0359b6ab3b7 Mon Sep 17 00:00:00 2001
From: Nook Scheel <nook@live.ru>
Date: Sun, 29 Nov 2015 21:25:09 +0300
Subject: [PATCH 1/3] Optimizations for asyncToGenerator

Never use a bind!
Never use arguments as an array!
---
 packages/babel-helpers/src/helpers.js | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/packages/babel-helpers/src/helpers.js b/packages/babel-helpers/src/helpers.js
index 3774425b70..d62c7e215d 100644
--- a/packages/babel-helpers/src/helpers.js
+++ b/packages/babel-helpers/src/helpers.js
@@ -58,12 +58,12 @@ helpers.jsx = template(`
 helpers.asyncToGenerator = template(`
   (function (fn) {
     return function () {
-      var gen = fn.apply(this, arguments);
-
+      var args = new Array(arguments.length);
+      for(var i = 0; i < args.length; ++i) {
+        args[i] = arguments[i];
+      }
+      var gen = fn.apply(this, args);
       return new Promise(function (resolve, reject) {
-        var callNext = step.bind(null, "next");
-        var callThrow = step.bind(null, "throw");
-
         function step(key, arg) {
           try {
             var info = gen[key](arg);
@@ -76,11 +76,15 @@ helpers.asyncToGenerator = template(`
           if (info.done) {
             resolve(value);
           } else {
-            Promise.resolve(value).then(callNext, callThrow);
+            Promise.resolve(value).then(function (value) {
+              step.call(null, "next", value);
+            }, function (err) {
+              step.call(null, "throw", err);
+            });
           }
         }
 
-        callNext();
+        step.call(null, "next");
       });
     };
   })

From b2ff128e9424d729edb96c484599e3cfd6f84b2d Mon Sep 17 00:00:00 2001
From: Nook Scheel <nook@live.ru>
Date: Sun, 29 Nov 2015 21:28:14 +0300
Subject: [PATCH 2/3] Unnecessary #call

---
 packages/babel-helpers/src/helpers.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/babel-helpers/src/helpers.js b/packages/babel-helpers/src/helpers.js
index d62c7e215d..9a2b1e9f18 100644
--- a/packages/babel-helpers/src/helpers.js
+++ b/packages/babel-helpers/src/helpers.js
@@ -77,14 +77,14 @@ helpers.asyncToGenerator = template(`
             resolve(value);
           } else {
             Promise.resolve(value).then(function (value) {
-              step.call(null, "next", value);
+              step("next", value);
             }, function (err) {
-              step.call(null, "throw", err);
+              step("throw", err);
             });
           }
         }
 
-        step.call(null, "next");
+        step("next");
       });
     };
   })

From a81e11c4aeaf2850f8035af2753a3a6f11daa3ec Mon Sep 17 00:00:00 2001
From: Nook Scheel <nook@live.ru>
Date: Sun, 29 Nov 2015 21:47:04 +0300
Subject: [PATCH 3/3] Use arguments with #apply

---
 packages/babel-helpers/src/helpers.js | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/packages/babel-helpers/src/helpers.js b/packages/babel-helpers/src/helpers.js
index 9a2b1e9f18..5031b1eb0f 100644
--- a/packages/babel-helpers/src/helpers.js
+++ b/packages/babel-helpers/src/helpers.js
@@ -58,11 +58,7 @@ helpers.jsx = template(`
 helpers.asyncToGenerator = template(`
   (function (fn) {
     return function () {
-      var args = new Array(arguments.length);
-      for(var i = 0; i < args.length; ++i) {
-        args[i] = arguments[i];
-      }
-      var gen = fn.apply(this, args);
+      var gen = fn.apply(this, arguments);
       return new Promise(function (resolve, reject) {
         function step(key, arg) {
           try {