This extension is no longer an extension, part of the code has been moved to Wikibase, some to a JS npm packages and the rest will be a composer library.
Related Gerrit Patches:
|mediawiki/tools/release : master||Remove DataTypes extension from make-wmf-branch script|
|Resolved||Addshore||T173818 [Epic] Kill the Wikidata build step|
|Resolved||WMDE-leszek||T180454 Sort out the mess that is the DataTypes extension / library / npm packages in order to kill the build|
|Resolved||Addshore||T180455 Remove DataTypes extension from make-wmf-branch script|