Improvement
- Set minimum Node version to 12.x.x fc712f7
Upgrade required
Node 12 has been out for a while now and since this is a standalone tool (not a library that’s used as a dependency of some larger application) there’s no real reason to support old Node versions.
As a bonus, Node 12 has Array.prototype.flat() and Array.prototype.flatMap() so now we can drop the core-js dependency.