Use the runtime transform instead of the polyfill.

.babelrc

@@ -1,3 +1,4 @@
 {
-  "presets": ["es2015"]
+  "presets": ["es2015"],
+  "plugins": ["transform-runtime"]
 }

package.json

@@ -9,7 +9,7 @@
     "nodegit",
     "regret"
   ],
-  "repository" : {
+  "repository": {
     "type": "git",
     "url": "https://github.com/github/ohnogit.git"
   },
@@ -24,8 +24,9 @@
   "license": "BSD",
   "devDependencies": {
     "babel-cli": "^6.7.5",
-    "babel-polyfill": "^6.7.4",
+    "babel-plugin-transform-runtime": "^6.7.5",
     "babel-preset-es2015": "^6.6.0",
+    "babel-runtime": "^6.6.1",
     "jasmine": "^2.4.1",
     "temp": "^0.8.3",
     "tslint": "^3.7.4",

spec/resource-pool-spec.ts

@@ -1,5 +1,3 @@
-require('babel-polyfill')
-
 import ResourcePool from '../lib/resource-pool'
 
 import {asyncIt, wait} from './async-spec-helpers'