d336239de07407a578593d111db9723d08122aa7 Typescript: use method did…

… not explicity set return types

https://datatables.net/forums/discussion/79516/

Sync to source repo @d336239de07407a578593d111db9723d08122aa7

datatables.json

@@ -14,5 +14,5 @@
     ],
     "src-repo": "http://github.com/DataTables/DataTablesSrc",
     "last-tag": "2.1.2",
-    "last-sync": "f98cbb2a61e6b26e769bb2c3321ad262875b64f9"
+    "last-sync": "d336239de07407a578593d111db9723d08122aa7"
 }