SVGO has been updated to new major version 2.x after some time without any updates.
It needs to be switched to JS configuration.
First exemplary configuration [[ https://gerrit.wikimedia.org/r/c/mediawiki/skins/Vector/+/674926 | is in Vector ]].
[[https://codesearch.wmcloud.org/deployed/?q=grunt-svgmin&i=nope&files=package%5C.json&excludeFiles=&repos=|Production uses]]:
[ ] MediaWiki
[ ] CentralNotice
[ ] Cite
[ ] Echo
[ ] GuidedTour
[ ] Kartographer
[x] MultimediaViewer - https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MultimediaViewer/+/678635
[ ] MobileFrontend - https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MobileFrontend/+/678403
[ ] Popups ("Page Previews")
[ ] RevisionSlider
[ ] TwoColConflict
[ ] UniversalLanguageSelector
[ ] MinervaNeue - https://gerrit.wikimedia.org/r/c/mediawiki/skins/MinervaNeue/+/678637
[ ] MonoBook
[ ] Timeless
[x] Vector – https://gerrit.wikimedia.org/r/c/mediawiki/skins/Vector/+/674926