DEPRECATION WARNING: Sprockets method `register_engine` is deprecated.

Explanation of DEPRECATION WARNING in Ruby

Step 1: The Sprockets method register_engine is being used in the Ruby code.

Step 2: This method is deprecated, which means it is no longer recommended for use in the current version of Sprockets.

Step 3: Deprecated methods are still functional in the current version but are likely to be removed in future versions.

Step 4: Developers are advised to find an alternative method or approach to achieve the same functionality to avoid issues in future versions.