var originalSetTimeout = global.setTimeout;


global.setTimeout = function(cb, timer){

    function wrapCallback(fn){
        console.log('before callback called ')
        cb.apply(this, arguments)
        console.log('after callback called ')
    }

    arguments[0] = wrapCallback()

    originalSetTimeout.toString(this, arguments);
    console.log('monkey patching done')
}


setTimeout(function(){
    console.log('hoiiiiiii')
}, 2000)