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I'm having an issue with adding a data attribute to my preprocessed / aggregated javascript within my theme.

When I have preprocessing disabled, I am able to add a data attribute to individual files within the .libraries.yml file as suggested within the Drupal docs. {attributes: {data-example-attribute: true}}

However once I enable ['js']['preprocess'] = true; to the settings.php file instead of my theme JS being aggregated into a single file they do not get aggregated at all.

Is there a hook that I'm missing which I could use to just prepend a data attribute onto the preprocessed JS file.

Using Drupal 9

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  • What should happen to the attributes on a script tag that aggregates multiple files if two libraries specify different values for the same data- attribute?
    – cilefen
    Oct 24, 2022 at 15:42
  • @cilefen Thanks for your reply. In this instance all the files within the library require the same data attribute.
    – Ian
    Oct 24, 2022 at 16:37
  • This issue seems like it is related, although if I am reading it right it could cause issues with data- attributes if merged, because it does not account for attribute values: drupal.org/project/drupal/issues/1587536
    – cilefen
    Oct 24, 2022 at 17:26

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