Due to the work on https://phabricator.wikimedia.org/T253334, the way that ResourceLoader processes single-file Vue components is about to change. Per @Catrope, this change will allow .vue files to use :foo and @bar short-hand properties, but self-closing component tags like <App /> will no longer be allowed.
The code in MachineVision's front-end will need to be migrated and linter rules updated to reflect the new parsing process.
Change 606378 had a related patch set uploaded (by Catrope; owner: Catrope):
[mediawiki/extensions/MachineVision@master] Ban self-closing tags in Vue files
Change 606553 had a related patch set uploaded (by Catrope; owner: Catrope):
[mediawiki/extensions/MachineVision@master] eslint: Require shorthand syntax for v-bind/v-on/v-slot
Change 606378 merged by jenkins-bot:
[mediawiki/extensions/MachineVision@master] eslint: Ban self-closing tags in Vue files
Change 606553 merged by jenkins-bot:
[mediawiki/extensions/MachineVision@master] eslint: Use shorthand syntax for v-bind/v-on/v-slot
As long as the UI continues to work after the change, everything is a-ok! Any noticeable change for the user indicates a bug.