A new npm version has been released! This fixes some bugs, including no longer claiming to not support node v13.
Get it in the usual ways:
npm i -g npm@latest
6508e833d#269 add node v13 as a supported version (@ljharb)
b6588a8f7#265 Fix regression in lockfile repair for sub-deps (@feelepxyz)
d5dfe57a1#266 resolve circular dependency in pack.js (@addaleax)