I can't remember the last time PR comments addressed minor formatting issues at all, in any language. If something is hard to grok it usually has to do with logic, not if there's a space between `if` and `(`.
For example
git blame a1b2c4 -- foo.js
Where a1b2c4 is the commit hash. Could even tag the commit to make it more convenient: git tag beforeRefmt a1b2c4
git blame beforeRefmt —- foo.js
and push the tag up for everyone to have access to it git push —-tags