Fix tslint error.
Fix tslint error.

NativeScript/NativeScript,hdeshev/NativeScript,hdeshev/NativeScript,genexliu/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript,genexliu/NativeScript,NativeScript/NativeScript,genexliu/NativeScript,NativeScript/NativeScript,hdeshev/NativeScript