Modularize master branch.

defaults.js

@@ -0,0 +1,32 @@
+import apply from './_apply.js';
+import assignInWith from './assignInWith.js';
+import baseRest from './_baseRest.js';
+import customDefaultsAssignIn from './_customDefaultsAssignIn.js';
+
+/**
+ * Assigns own and inherited enumerable string keyed properties of source
+ * objects to the destination object for all destination properties that
+ * resolve to `undefined`. Source objects are applied from left to right.
+ * Once a property is set, additional values of the same property are ignored.
+ *
+ * **Note:** This method mutates `object`.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns `object`.
+ * @see _.defaultsDeep
+ * @example
+ *
+ * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+ * // => { 'a': 1, 'b': 2 }
+ */
+var defaults = baseRest(function(args) {
+  args.push(undefined, customDefaultsAssignIn);
+  return apply(assignInWith, undefined, args);
+});
+
+export default defaults;