I started using node v12 in my branch because I use some killer bleeding-edge features (array.flat lol) and jest wouldn't let me use it otherwise. But since then our unit tests started failing. The cause is change dsort algo (it is stable now 🎉) in the V8, shipped in Node.js v11.

I will fix the tests in my branch and after merging the branch we can bump the required node version to 12.

https://www.reddit.com/r/javascript/comments/9sb87m/chrome_70_and_nodejs_11_no_longer_sort_arrays/
nodejs/node#22754 (comment)