Describing internal function via JSDoc - jsdoc

Question

I have such code:
var f = function(){
var obj = {};
obj.keyA = "val";
obj.keyB = function(arg2){}
return obj;
}
arg2 is a {string}.
Is it possible to describe this code fine using JSDoc?
As you see, this code is attemption to implement smth like an object-oriented code. It is because I should work with old JavaScript engine (ECMA 262 Edition 3, parts of Edition 4, 5 and 6). It seems, this engine does not support classes (an interpreter thrown a syntax error).
So, is it possible to describe the code above in a way that JSDoc generates readable documentation?

Answer 1

I'd suggest using a custom tag typedef which will allow you to describe inner type in the first place e.g.
/**
* Definition for keyB
* #callback KeyBCallback
* #param {*} arg2
* #returns {void}
*/
/**
* Definition of an internal obj
* #typedef {Object} InternalObj
* #property {string} keyA - some property
* #property {KeyBCallback} keyB - a callback stored in keyB
*/
Lastly, you need to put InternalObj as a return value for your function e.g.
/**
* Function f
* #returns {InternalObj}
*/
var f = function(){
var obj = {};
obj.keyA = "val";
obj.keyB = function(arg2){}
return obj;
}