Merge pull request #5613 from chrootsu/lodash-identity

lodash: changed _.identity() method

lodash/lodash-tests.ts

@@ -1650,8 +1650,6 @@ var testAttempFn: TestAttemptFn;
 result = <TResult|Error>_.attempt<TResult>(testAttempFn);
 result = <TResult|Error>_(testAttempFn).attempt<TResult>();
 
-result = <{ name: string }>_.identity({ 'name': 'moe' });
-
 _.mixin({
     'capitalize': function (string) {
         return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
@@ -1907,6 +1905,22 @@ result = <() => boolean>_(true).constant<boolean>();
 result = <() => any[]>_(['a']).constant<any[]>();
 result = <() => {}>_({}).constant<{}>();
 
+// _.identity
+{
+    let testIdentityValue: TResult;
+    let result: TResult;
+    result = _.identity<TResult>(testIdentityValue);
+    result = _(testIdentityValue).identity();
+}
+{
+    let result: number;
+    result = _(42).identity();
+}
+{
+    let result: boolean[];
+    result = _<boolean>([]).identity();
+}
+
 // _.method
 class TestMethod {
     a = {

lodash/lodash.d.ts

@@ -8055,13 +8055,34 @@ declare module _ {
     //_.identity
     interface LoDashStatic {
         /**
-        * This method returns the first argument provided to it.
-        * @param value Any value.
-        * @return value.
-        **/
+         * This method returns the first argument provided to it.
+         * @param value Any value.
+         * @return Returns value.
+         */
         identity<T>(value?: T): T;
     }
 
+    interface LoDashWrapper<T> {
+        /**
+         * @see _.identity
+         */
+        identity(): T;
+    }
+
+    interface LoDashArrayWrapper<T> {
+        /**
+         * @see _.identity
+         */
+        identity(): T[];
+    }
+
+    interface LoDashObjectWrapper<T> {
+        /**
+         * @see _.identity
+         */
+        identity(): T;
+    }
+
     //_.method
     interface LoDashStatic {
         /**