Per discussion in 🌱 Drupal 10 JavaScript dependency plan Fixed , the js-cookie library is unused in core after refactoring elsewhere. It is however used in multiple contrib modules.
We should deprecate it in 10.1.0 for removal in 11.0.0 to have one less external JavaScript dependency. Not sure if this also needs us to create a contrib module for it, but probably.
The js-cookie library is unused in core after refactoring. js-cookie has therefore been deprecated as a core dependency → and there is no replacement. Contributed modules or custom code relying on this library should declare their own dependency on it.
Fixed
10.1 ✨
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I have added a new module https://www.drupal.org/project/js_cookie → for this library dependency. I will work on updating the change record as appropriately with before/after instructions.
It looks to me like we've missed removing core/js-cookie from 11.x so far... what are the steps to get that to happen, or is it too late?