promise.js

/* Initialize CSInterface */
var csInterface = new CSInterface();

/* Nested callbacks (callback hell) */
csInterface.evalScript('firstFunction()', function(firstResult){
    csInterface.evalScript(`secondFunction(${firstResult})`, function(secondResult){
        csInterface.evalScript(`thirdFunction(${secondResult})`, function(thirdResult){
            // more callbacks..!
        })
    })
})