delivery.HTTP(publicMux, delivery.Service{
    CalculateSaleEvent: usecase.NewCalculateSaleEvent(saleCalculator),
    TmEnrichMany:       usecase.NewTmEnrichMany(saleCalculator),
})

var obj = {
    prop: 1,
    getProp: function(){
         return function() { console.log(this.prop) };
    },
};

obj.getProp()();

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var obj = {
    prop: 1,
    getProp: function(){
         return function () {
              console.log(this.prop);
         }
    },
};