mediawiki/extensions/WikiShare has been archived in 2017 via T178771 because it was marked archived on www.mediawiki.org
Eventually @Varnent requested on https://www.mediawiki.org/wiki/Gerrit/New_repositories/Requests/Entries to enable again the repository.
So I guess it is all about marking it active again and catch up with 3 years of development to bring it up :]
**To-do list**
- This task
-- [X] Add maintainers of that extension/skin as subscribers to this task (if they have no apparent Phabricator account, notify them on-wiki or via email if possible and note it here).
-- [X] Add Phabricator project #MediaWiki-extensions-WikiShare as a tag for this task
- On-wiki documentation
-- [X] Unarchive documentation on `mediawiki.org` (provide URL):
-- [X] Update Wikidata item (provide URL) associated with documentation page
--- [X] remove statement `Abandonware (Q281039)` from `instance of (P31)` (the Wikidata item was archived the old way, and never had an abandonware claim)
--- [X] remove qualifier `end time (P582)` from `instance of (P31) = MediaWiki extension (Q6805426)`
- Phabricator
-- [X] Unarchive Phabricator project #MediaWiki-extensions-WikiShare for the extension/skin.
- Translatewiki.net/translations
-- [X] Add to `translatewiki.net` ([[ https://gerrit.wikimedia.org/r/plugins/gitiles/translatewiki/+/refs/heads/master/groups/MediaWiki/mediawiki-extensions.txt | groups/MediaWiki/mediawiki-extensions.txt ]])
- Configuration/tests/integrations/etc.
-- [ ] Re-add tests in [[ https://gerrit.wikimedia.org/g/integration/config | integration/config ]] ([[ https://gerrit.wikimedia.org/r/plugins/gitiles/integration/config/+/master/zuul/layout.yaml | zuul/layout.yaml ]]).
- Repositories
-- [x] Add content to repository
-- [x] Add to [[ https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/+/master | mediawiki/extensions ]] (along with in `.gitmodules`).
-- [x] Unmark the repository as read-only in Gerrit (also edit description to remove "[ARCHIVED]"): ( https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/WikiShare).
-- [x] Unarchive the Diffusion repository for the extension/skin: rEWSH
-- [x] Recreate the GitHub mirror: https://github.com/wikimedia/mediawiki-extensions-WikiShare