$ yarn add babel-preset-stage-3 --dev

package.json

@@ -17,6 +17,7 @@
     "babel-core": "^6.18.2",
     "babel-loader": "^6.2.7",
     "babel-preset-es2015": "^6.18.0",
+    "babel-preset-stage-3": "^6.17.0",
     "serverless": "^1.1.0",
     "serverless-webpack": "^1.0.0-rc.2",
     "webpack-node-externals": "^1.5.4",

yarn.lock

@@ -246,6 +246,14 @@ babel-generator@^6.18.0:
     lodash "^4.2.0"
     source-map "^0.5.0"
 
+babel-helper-builder-binary-assignment-operator-visitor@^6.8.0:
+  version "6.18.0"
+  resolved "https://registry.yarnpkg.com/babel-helper-builder-binary-assignment-operator-visitor/-/babel-helper-builder-binary-assignment-operator-visitor-6.18.0.tgz#8ae814989f7a53682152e3401a04fabd0bb333a6"
+  dependencies:
+    babel-helper-explode-assignable-expression "^6.18.0"
+    babel-runtime "^6.0.0"
+    babel-types "^6.18.0"
+
 babel-helper-call-delegate@^6.18.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babel-helper-call-delegate/-/babel-helper-call-delegate-6.18.0.tgz#05b14aafa430884b034097ef29e9f067ea4133bd"
@@ -264,6 +272,14 @@ babel-helper-define-map@^6.18.0, babel-helper-define-map@^6.8.0:
     babel-types "^6.18.0"
     lodash "^4.2.0"
 
+babel-helper-explode-assignable-expression@^6.18.0:
+  version "6.18.0"
+  resolved "https://registry.yarnpkg.com/babel-helper-explode-assignable-expression/-/babel-helper-explode-assignable-expression-6.18.0.tgz#14b8e8c2d03ad735d4b20f1840b24cd1f65239fe"
+  dependencies:
+    babel-runtime "^6.0.0"
+    babel-traverse "^6.18.0"
+    babel-types "^6.18.0"
+
 babel-helper-function-name@^6.18.0, babel-helper-function-name@^6.8.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babel-helper-function-name/-/babel-helper-function-name-6.18.0.tgz#68ec71aeba1f3e28b2a6f0730190b754a9bf30e6"
@@ -303,6 +319,16 @@ babel-helper-regex@^6.8.0:
     babel-types "^6.18.0"
     lodash "^4.2.0"
 
+babel-helper-remap-async-to-generator@^6.16.0, babel-helper-remap-async-to-generator@^6.16.2:
+  version "6.18.0"
+  resolved "https://registry.yarnpkg.com/babel-helper-remap-async-to-generator/-/babel-helper-remap-async-to-generator-6.18.0.tgz#336cdf3cab650bb191b02fc16a3708e7be7f9ce5"
+  dependencies:
+    babel-helper-function-name "^6.18.0"
+    babel-runtime "^6.0.0"
+    babel-template "^6.16.0"
+    babel-traverse "^6.18.0"
+    babel-types "^6.18.0"
+
 babel-helper-replace-supers@^6.18.0, babel-helper-replace-supers@^6.8.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babel-helper-replace-supers/-/babel-helper-replace-supers-6.18.0.tgz#28ec69877be4144dbd64f4cc3a337e89f29a924e"
@@ -342,6 +368,42 @@ babel-plugin-check-es2015-constants@^6.3.13:
   dependencies:
     babel-runtime "^6.0.0"
 
+babel-plugin-syntax-async-functions@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-async-functions/-/babel-plugin-syntax-async-functions-6.13.0.tgz#cad9cad1191b5ad634bf30ae0872391e0647be95"
+
+babel-plugin-syntax-async-generators@^6.5.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-async-generators/-/babel-plugin-syntax-async-generators-6.13.0.tgz#6bc963ebb16eccbae6b92b596eb7f35c342a8b9a"
+
+babel-plugin-syntax-exponentiation-operator@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-exponentiation-operator/-/babel-plugin-syntax-exponentiation-operator-6.13.0.tgz#9ee7e8337290da95288201a6a57f4170317830de"
+
+babel-plugin-syntax-object-rest-spread@^6.8.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-object-rest-spread/-/babel-plugin-syntax-object-rest-spread-6.13.0.tgz#fd6536f2bce13836ffa3a5458c4903a597bb3bf5"
+
+babel-plugin-syntax-trailing-function-commas@^6.3.13:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-syntax-trailing-function-commas/-/babel-plugin-syntax-trailing-function-commas-6.13.0.tgz#2b84b7d53dd744f94ff1fad7669406274b23f541"
+
+babel-plugin-transform-async-generator-functions@^6.17.0:
+  version "6.17.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-async-generator-functions/-/babel-plugin-transform-async-generator-functions-6.17.0.tgz#d0b5a2b2f0940f2b245fa20a00519ed7bc6cae54"
+  dependencies:
+    babel-helper-remap-async-to-generator "^6.16.2"
+    babel-plugin-syntax-async-generators "^6.5.0"
+    babel-runtime "^6.0.0"
+
+babel-plugin-transform-async-to-generator@^6.16.0:
+  version "6.16.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-async-to-generator/-/babel-plugin-transform-async-to-generator-6.16.0.tgz#19ec36cb1486b59f9f468adfa42ce13908ca2999"
+  dependencies:
+    babel-helper-remap-async-to-generator "^6.16.0"
+    babel-plugin-syntax-async-functions "^6.8.0"
+    babel-runtime "^6.0.0"
+
 babel-plugin-transform-es2015-arrow-functions@^6.3.13:
   version "6.8.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-arrow-functions/-/babel-plugin-transform-es2015-arrow-functions-6.8.0.tgz#5b63afc3181bdc9a8c4d481b5a4f3f7d7fef3d9d"
@@ -511,6 +573,21 @@ babel-plugin-transform-es2015-unicode-regex@^6.3.13:
     babel-runtime "^6.0.0"
     regexpu-core "^2.0.0"
 
+babel-plugin-transform-exponentiation-operator@^6.3.13:
+  version "6.8.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-exponentiation-operator/-/babel-plugin-transform-exponentiation-operator-6.8.0.tgz#db25742e9339eade676ca9acec46f955599a68a4"
+  dependencies:
+    babel-helper-builder-binary-assignment-operator-visitor "^6.8.0"
+    babel-plugin-syntax-exponentiation-operator "^6.8.0"
+    babel-runtime "^6.0.0"
+
+babel-plugin-transform-object-rest-spread@^6.16.0:
+  version "6.16.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-object-rest-spread/-/babel-plugin-transform-object-rest-spread-6.16.0.tgz#db441d56fffc1999052fdebe2e2f25ebd28e36a9"
+  dependencies:
+    babel-plugin-syntax-object-rest-spread "^6.8.0"
+    babel-runtime "^6.0.0"
+
 babel-plugin-transform-regenerator@^6.16.0:
   version "6.16.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-regenerator/-/babel-plugin-transform-regenerator-6.16.1.tgz#a75de6b048a14154aae14b0122756c5bed392f59"
@@ -555,6 +632,16 @@ babel-preset-es2015:
     babel-plugin-transform-es2015-unicode-regex "^6.3.13"
     babel-plugin-transform-regenerator "^6.16.0"
 
+babel-preset-stage-3:
+  version "6.17.0"
+  resolved "https://registry.yarnpkg.com/babel-preset-stage-3/-/babel-preset-stage-3-6.17.0.tgz#b6638e46db6e91e3f889013d8ce143917c685e39"
+  dependencies:
+    babel-plugin-syntax-trailing-function-commas "^6.3.13"
+    babel-plugin-transform-async-generator-functions "^6.17.0"
+    babel-plugin-transform-async-to-generator "^6.16.0"
+    babel-plugin-transform-exponentiation-operator "^6.3.13"
+    babel-plugin-transform-object-rest-spread "^6.16.0"
+
 babel-register@^6.18.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babel-register/-/babel-register-6.18.0.tgz#892e2e03865078dd90ad2c715111ec4449b32a68"