Mojito currently requires the yui3 package, which is only available on Linux and Mac. It ships YUI 3.4.X for nodejs. However, there are yui 3.5 packages that can be installed on Windows systems: http://search.npmjs.org/#/yui https://github.com/davglass/nodejs-yui3/issues/20
I did not test Mojito with those, but it might be worth a shot. I don't have a Windows system at hand, where I could try it.