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hook_menu_links_discovered_alter() not being called

I’m working on a theme for a Drupal 8.8 project. I’ve implemented hook_menu_links_discovered_alter() in my .theme file – but Drupal doesn’t seem to be invoking it, and I don’t understand why.

(For context: my goal is to make some modifications to the “Log in” and “Log out” links on the user account menu. I’ve found numerous examples online which say that this is the right hook to use for this purpose.)

Here’s what I’ve tried:

  • I’ve checked (a dozen times) that I’m using the correct function name, with the correct signature: mythemename_menu_links_discovered_alter(&$links)

  • I’ve added die('in hook') in my hook function to determine whether it’s even being called. (It’s not.)

  • I’ve cleared cache many times, from both the Drupal web dashboard and via drush cr. No luck.

  • I’ve noticed that Drupal sometimes takes a while to notice changes to .theme files, even after you’ve cleared cache. So, to be absolutely sure that Drupal is using the latest version of the file, I’ve added echo statements to other (already-working) hooks. This has confirmed that Drupal is using the latest version of the file – but mythemename_menu_links_discovered_alter() still isn’t being called.

Any ideas?

This article was republished from its original source.
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