diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..42bfb25
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,10 @@
+{
+    "presets": [
+      [
+        "@babel/preset-env",
+        {
+          "useBuiltIns": "entry"
+        }
+      ]
+    ]
+  }
\ No newline at end of file
diff --git a/.browserslistrc b/.browserslistrc
new file mode 100644
index 0000000..bd9fb77
--- /dev/null
+++ b/.browserslistrc
@@ -0,0 +1,2 @@
+> 0.25%
+not dead
\ No newline at end of file
diff --git a/lib/index.js b/lib/index.js
new file mode 100644
index 0000000..0c808c8
--- /dev/null
+++ b/lib/index.js
@@ -0,0 +1,52 @@
+/*!
+ * assign-deep <https://github.com/jonschlinkert/assign-deep>
+ *
+ * Copyright (c) 2017-present, Jon Schlinkert.
+ * Released under the MIT License.
+ */
+'use strict';
+
+function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+var assignSymbols = require('assign-symbols');
+
+var toString = Object.prototype.toString;
+
+var assign = module.exports = function (target) {
+  var i = 0;
+
+  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    args[_key - 1] = arguments[_key];
+  }
+
+  if (isPrimitive(target)) target = args[i++];
+  if (!target) target = {};
+
+  for (; i < args.length; i++) {
+    if (isObject(args[i])) {
+      var _arr = Object.keys(args[i]);
+
+      for (var _i = 0; _i < _arr.length; _i++) {
+        var key = _arr[_i];
+
+        if (isObject(target[key]) && isObject(args[i][key])) {
+          assign(target[key], args[i][key]);
+        } else {
+          target[key] = args[i][key];
+        }
+      }
+
+      assignSymbols(target, args[i]);
+    }
+  }
+
+  return target;
+};
+
+function isObject(val) {
+  return typeof val === 'function' || toString.call(val) === '[object Object]';
+}
+
+function isPrimitive(val) {
+  return _typeof(val) === 'object' ? val === null : typeof val !== 'function';
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index 35d6533..d862e28 100644
--- a/package.json
+++ b/package.json
@@ -14,19 +14,24 @@
   },
   "license": "MIT",
   "files": [
-    "index.js"
+    "lib/index.js"
   ],
-  "main": "index.js",
+  "main": "lib/index.js",
   "engines": {
     "node": ">=6"
   },
   "scripts": {
-    "test": "mocha"
+    "test": "mocha",
+    "prepublish": "npm run build",
+    "build": "babel -d lib/ index.js"
   },
   "dependencies": {
     "assign-symbols": "^2.0.2"
   },
   "devDependencies": {
+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.1",
+    "@babel/preset-env": "^7.0.0",
     "gulp-format-md": "^1.0.0",
     "mocha": "^5.2.0"
   },