As of my knowledge cutoff in September 2021, the unique filter provided by AngularUI for AngularJS is not officially deprecated. However, it's important to note that AngularJS itself has been officially deprecated by the Angular team in favor of Angular (also known as Angular 2+).

Since AngularJS is in a maintenance mode, it means that there won't be any new features or major updates, and only critical bug fixes and security updates will be provided. As a result, it's recommended to migrate to the latest version of Angular to take advantage of the latest features, performance improvements, and long-term support.

If you're still using AngularJS and the unique filter from AngularUI, you might want to consider migrating your application to Angular (the latest version) for continued support and access to a broader ecosystem of libraries, tools, and resources.

When migrating from AngularJS to Angular, be aware that many concepts and APIs are different between the two frameworks. You'll need to rewrite your code and familiarize yourself with Angular's architecture and best practices. The good news is that Angular has provided guidance and tools to help with the migration process, such as the "ngMigration Assistant" and the "UpgradeModule."

Before starting the migration, carefully plan your approach and conduct thorough testing to ensure a smooth transition and minimize potential issues.

Keep in mind that software development is continuously evolving, and the status of libraries and frameworks might change after my knowledge cutoff date. Therefore, I recommend checking the latest official documentation and community discussions for the most up-to-date information regarding the unique filter from AngularUI and the current state of AngularJS.

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