diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 4c587b57b..a6c2d4719 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -3345,11 +3345,37 @@ module TestShuffle {
     }
 }
 
-result = <number>_.size([1, 2]);
-result = <number>_([1, 2]).size();
-result = <number>_.size({ 'one': 1, 'two': 2, 'three': 3 });
-result = <number>_({ 'one': 1, 'two': 2, 'three': 3 }).size();
-result = <number>_.size('curly');
+// _.size
+module TestSize {
+    type SampleType = {a: string; b: number; c: boolean;};
+
+    let array: SampleType[];
+    let list: _.List<SampleType>;
+    let dictionary: _.Dictionary<SampleType>;
+
+    {
+        let result: number;
+
+        result = _.size<SampleType>(array);
+        result = _.size<SampleType>(list);
+        result = _.size<SampleType>(dictionary);
+        result = _.size('');
+
+        result = _(array).size();
+        result = _(list).size();
+        result = _(dictionary).size();
+        result = _('').size();
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<number>;
+
+        result = _(array).chain().size();
+        result = _(list).chain().size();
+        result = _(dictionary).chain().size();
+        result = _('').chain().size();
+    }
+}
 
 // _.some
 module TestSome {
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index 98d8bf55d..067efa9b7 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -6423,47 +6423,62 @@ declare module _ {
     //_.size
     interface LoDashStatic {
         /**
-        * Gets the size of the collection by returning collection.length for arrays and array-like
-        * objects or the number of own enumerable properties for objects.
-        * @param collection The collection to inspect.
-        * @return collection.length
-        **/
-        size<T>(collection: Array<T>): number;
+         * Gets the size of collection by returning its length for array-like values or the number of own enumerable
+         * properties for objects.
+         *
+         * @param collection The collection to inspect.
+         * @return Returns the size of collection.
+         */
+        size<T>(collection: List<T>|Dictionary<T>): number;
 
         /**
-        * @see _.size
-        **/
-        size<T>(collection: List<T>): number;
+         * @see _.size
+         */
+        size(collection: string): number;
+    }
 
+    interface LoDashImplicitWrapper<T> {
         /**
-        * @see _.size
-        * @param object The object to inspect
-        * @return The number of own enumerable properties.
-        **/
-        size<T extends {}>(object: T): number;
-
-        /**
-        * @see _.size
-        * @param aString The string to inspect
-        * @return The length of aString
-        **/
-        size(aString: string): number;
+         * @see _.size
+         */
+        size(): number;
     }
 
     interface LoDashImplicitArrayWrapper<T> {
         /**
          * @see _.size
-         **/
+         */
         size(): number;
     }
 
     interface LoDashImplicitObjectWrapper<T> {
         /**
          * @see _.size
-         **/
+         */
         size(): number;
     }
 
+    interface LoDashExplicitWrapper<T> {
+        /**
+         * @see _.size
+         */
+        size(): LoDashExplicitWrapper<number>;
+    }
+
+    interface LoDashExplicitArrayWrapper<T> {
+        /**
+         * @see _.size
+         */
+        size(): LoDashExplicitWrapper<number>;
+    }
+
+    interface LoDashExplicitObjectWrapper<T> {
+        /**
+         * @see _.size
+         */
+        size(): LoDashExplicitWrapper<number>;
+    }
+
     //_.some
     interface LoDashStatic {
         /**