Should I use node 12.x or stick with 10.x for my npm package?

I wrote a wrapper around api, this package has 8k overall downloads.I want to publish new version of it but I used `flat` and `flatmap` methods in that version, should I force users to use node 12.x (since it's recommended node version at the moment) or stick with 10.x and use polyfill?

Submitted December 03, 2019 at 12:51PM by ditrohurto