How to run phantomjs with object.assign?

Question

PhantomJS

QQ colleagues.
When I run the phantomjs script for a site that loads a js script with the Object.assign function, I get an error:

TypeError:: undefined is not a function (evaluating 'Object.assign')

I quickly found the reason - phantomjs does not work according to the ES-2015 standard, therefore, it does not know the Object.assign function. I also found the supposed solution - add a polyfill ( https://github.com/chuckplantain/phantomjs-polyfil... ) .
I tried to include a js file in different ways - both through injectJs and includeJs, and wrote require with an absolute path, but I still get this error.
The question is: how to connect this polyfill?
Thank you.