Chris Pojer’s Interface class mutates a class, and inforces a well architected interface on your class. The Interface is checked when the class’s “initialize” method is run. What we’re doing here is attaching a pre-defined interface to a new Module constructor. This module constructor ensures that the namespace property is declared - an is a string; Also it states that theother property is a function. This is how I enforce a particular class structure on the rest of the team for large scal projects.

For more information on this particular Interface mixin, look at this example and download Chris Pojer’s interface here.

var TheModuleInterface = new Interface({
      namespace: String,
      theother: Function
});

var Module = new Type('Module', function (params){
    // Mind the order.  Your Interface needs to be the first argument when appending.
    params = Object.append({ Interface: TheModuleInterface }, params || {} ) ;
    return new Class(params);
});

var aModuleInstance = new Module({
    theother: "some string",
    namespace: {some:'object'},
    initialize: function(){
        // Remember your module needs an initialize method...
    }
});
var theMod = new Mod(); // Uncaught Error: Property "namespace" is implemented but not an instance of "String"