rplansky
diff --git a/‎type-definitions/Immutable.d.ts
Copy file name to clipboardExpand all lines: type-definitions/Immutable.d.ts
+2-2Lines changed: 2 additions & 2 deletions b/‎type-definitions/Immutable.d.ts
Copy file name to clipboardExpand all lines: type-definitions/Immutable.d.ts
+2-2Lines changed: 2 additions & 2 deletions
@@ -3878,15 +3878,15 @@ declare module Immutable {
      * In case the `Collection` is empty returns the optional default
      * value if provided, if no default value is provided returns undefined.
      */
-    first<NSV>(notSetValue?: NSV): V | NSV;
+    first<NSV = undefined>(notSetValue?: NSV): V | NSV;
 
     /**
      * In case the `Collection` is not empty returns the last element of the
      * `Collection`.
      * In case the `Collection` is empty returns the optional default
      * value if provided, if no default value is provided returns undefined.
      */
-    last<NSV>(notSetValue?: NSV): V | NSV;
+    last<NSV = undefined>(notSetValue?: NSV): V | NSV;
 
     // Reading deep values