:is
While this slightly reduces duplication in the CSS rules, some of the auto-formatting done by Prettier is perhaps not great. (Given the overall advantage of using Prettier, we'll probably have to simply accept this.)
no-var
prefer-spread
declaration-block-no-redundant-longhand-properties
for...of
ttx
class
test/add_test.js
verifyManifestFiles
"link": true
vars
no-unused-vars
rimraf
inset
unicorn/prefer-string-replace-all