integrationTests: test package with TS 4.2 (#3036)

Author: IvanGoncharov

integrationTests/ts/package.json

@@ -9,6 +9,7 @@
     "typescript-3.8": "npm:typescript@3.8.x",
     "typescript-3.9": "npm:typescript@3.9.x",
     "typescript-4.0": "npm:typescript@4.0.x",
-    "typescript-4.1": "npm:typescript@4.1.x"
+    "typescript-4.1": "npm:typescript@4.1.x",
+    "typescript-4.2": "npm:typescript@4.2.x"
   }
 }