In T207169 we added eslint-plugin-compat to our eslint config, but that didn't catch all IE11 incompatibilities. We also discovered that wikimedia was in the process of updating their eslint configuration to ensure compatibility with IE11. This process is finished now (see [[ https://github.com/wikimedia/eslint-config-wikimedia/issues/113 | #113 ]]) and we should update the eslint config in our projects to use the new mediawiki config. See their [[ https://github.com/wikimedia/eslint-config-wikimedia#wikimedia-eslint-config | README ]].
**Note:** There is no new a release yet, but it should be come soon: https://github.com/wikimedia/eslint-config-wikimedia/issues/117
**Acceptance criteria:**
- [ ] Wikibase extends `mediawiki/client`
- [ ] WikibaseLexeme extends `mediawiki/client`
- [ ] WikibaseQualityConstraints extends `mediawiki/client`
- [ ] FIXME extends `mediawiki/client`