Is TypeScript not using revealing module pattern for classes?

Question

Is TypeScript not using revealing module pattern for classes? I expected different result from this code.

class Test {

    private privateProperty: any;

    public publicProperty: any;     
}

generates this:

var Test = (function () {
    function Test() { }
    return Test;
})();

I expected something like this:

var test = (function(){
    var privateProperty;
    var publicProperty;

    return {
        publicProperty: publicProperty;
    };

})();

No, it’s not. private/public checking is just done by the compiler and doesn’t influence generated code. (But that’s just a guess. :)) Your second example wouldn’t be right, though; it doesn’t even return a function. — Ry-
– Ry- ♦, Commented Apr 1, 2013 at 16:36
The codegen for module is most similar to what you've posted — Ryan Cavanaugh
– Ryan Cavanaugh, Commented Apr 1, 2013 at 16:43
@minitech: No, it does not return function, it returns object literal. It is called revealing module pattern. See here: stackoverflow.com/questions/5647258/… — epitka
– epitka, Commented Apr 1, 2013 at 17:19
@epitka: Oh. Well that’s a module, not remotely a constructor. — Ry-
– Ry- ♦, Commented Apr 1, 2013 at 17:57
@minitech: What do you mean by "not remotely a constructor"? — epitka
– epitka, Commented Apr 2, 2013 at 15:08

Ryan Cavanaugh · Accepted Answer · 2013-04-01 17:33:07Z

9

RMP is not appropriate for class-based design. module does what you want:

module myMod {
    var x = 31;
    export var y = x + 15;
}

Generates:

var myMod;
(function (myMod) {
    var x = 31;
    myMod.y = x + 15;
})(myMod || (myMod = {}));

Salient features here:

Privates are captured with a closure
Public members are visible as own properties of the object
The object is created in an IIFE

answered Apr 1, 2013 at 17:33

Ryan Cavanaugh

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1 Comment

epitka Over a year ago

I thought that "class" in typescript correlates to what I consider a class in c#, meaning private and public members etc., and module more like a namespace

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