How do I add a javascript file to all admin pages via a plugin?

The Plugin Developer Handbook recommends using plugins_url() to create the URL to the JS file. Try using that function inside your script loader, and using a different handle for the script depending on the context (like prefixing the admin script name with “admin-“) to avoid conflicting script registration.

Alternatively, you can register the script just once, and enqueue it when needed on the enqueue hooks.

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