diff --git a/spec-mocha/.babelrc b/spec-mocha/.babelrc
new file mode 100644
index 0000000..bea32a4
--- /dev/null
+++ b/spec-mocha/.babelrc
@@ -0,0 +1,3 @@
+{
+  "presets": [ "es2015" ]
+}
diff --git a/src/.babelrc b/src/.babelrc
new file mode 100644
index 0000000..6365fbf
--- /dev/null
+++ b/src/.babelrc
@@ -0,0 +1,13 @@
+{
+  "presets": [
+    [
+      "es2015",
+      {
+        "modules": false
+      }
+    ]
+  ],
+  "plugins": [
+    "external-helpers"
+  ]
+}