I am trying to use once and some vanilla JS to eliminate our need for jQuery. However, I'm finding that I'm pulling once in through yarn as a dependency, then add it as a library in mytheme.libraries.yml. When that happens, it tells me it can't work because "require" is not defined. So then I add requiresJS as a dependency. Then it tells me "wrappy" is needed... I thought this was a no-dependency plugin?
Add to your theme as a library. Make it a dependency of another library (in our case, it was a dependency of some accordions functionality we were writing). Try to use `once('my-behavior', '.my-selector');`
Documentation on how to make this work / how it's intended to be used (or is it server-side only).
Fixed
Documentation
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
As we go from d9 to d10, modules are starting to remove the jquery.once dependency en masse. When a site has finally upgraded all of their modules, the dependency will be gone and any custom code that was using .once will no longer work. Anyone searching for this issue should refer to https://www.drupal.org/node/3158256 → where it shows us that it's not enough to just swap out the libraries reference, but also to change how the function is used in the code itself.