The same way we can call a pattern from Twig template with {{ pattern() }}, would it be possible to have the same API for JavaScript?
In UI Suite Bootstrap, I am starting to have the need for example in https://git.drupalcode.org/project/ui_suite_bootstrap/-/blob/5.0.x/asset... there could be calls to 2 patterns instead of reproducing the pattern HTML in JavaScript.
The same way there is Drupal.theme, automatically provide a Drupal.ui_patterns.pattern() or Drupal.ui_patterns.[pattern_id]().
Maybe there are solutions that already exist, because we should use the backed rendering to still benefits from the exact Twig template and potential preprocess.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
In my humble opinion, we need to close thsi one, because must be done on Drupal Render API level, which need to provide a safe endpoint.