From the prio session:

"Didn't vue3 say it dropped support for IE?"

Also, is this even under our control? We use the vue ResourceLoader package provided by MediaWiki core…

In T273592#6795736, @Addshore wrote:

From the prio session:

"Didn't vue3 say it dropped support for IE?"

I think it went from IE11 compat build in July 2020 -> Q4 2020 -> soon™

Apparently, vuetify has a page about how to make it IE11 compatible: https://vuetifyjs.com/en/getting-started/browser-support/#ie11-and-safari-9-support

Alternatively, we can also just consider this task to be blocked by T178356: Raise Grade A JavaScript requirement from ES5 (2009) to ES6 (2015). Then we can tackle the upgrade when IE 11 is no longer a Grade A browser.

In T273592#6795813, @Lucas_Werkmeister_WMDE wrote:

Also, is this even under our control? We use the vue ResourceLoader package provided by MediaWiki core…

Wikibase could just ship its own vue3 package. Or we could add a vue3 package to core, I would hope that this won't be a big deal either way

It was also raised in 2 prio sessions that we probably don't want to do this until the migration path / compat layer has been created by the vue core team.