Apparently, wikibase are replacing their JS data model, and we're using it in wikibase.mediainfo.statements (introduced in https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikibaseMediaInfo/+/491288)
Should we localise our own version of the WB datamodel?
Should we try to keep up-to-date with upstream changes?
Just use plain JS literals that represent valid API output?
Let's figure out exactly what's changing (@Jdforrester-WMF may know more?) and come up with a plan.