Query for Module.cwrap

I have one requirement on unity3d, we have received code related to unity where we have **.jsgz file under Release folder. Inside this .jsgz file there is another file *.js file where I have below function call. Module.cwrap("SendMessageString","void",["string","string","string"])(gameObject,func,param) I know that cwrap function is used to call C or C++ function from JavaScript but when I was checked syntax in google it have three parameters like below.

("SendMessageString","void",["string","string","string"])

But here in my code I can see there are another parameter passed in braces like below.

(gameObject,func,param) I have googled but not getting any help, any one helps me to understand below call

Module.cwrap("SendMessageString","void",["string","string","string"])(gameObject,func,param)

Regards, Ramesh