Pre-process node_modules in Cypress Commands

[ickata]

I have a very strange setup due to legacy reasons. I need to run tests on Chrome 45, which is a pretty old version (~7 years). I found out that Cypress 2.1.0 works for me.

Now the problem comes with Cypress plugins having modern (ES6+) javascript. Chrome 45 does not understand it and throws. I need somehow to pre-process these files. I saw that Cypress plugins framework provides a "preprocess" hook, but unfortunately I couldn't make it work.

Any help/advice is appreciated.