Using copilot to refactor entire files?

Say you have a function called findBoobies() beneath it I can for example write: // rewrite findBoobies to use .filter() function findBoobies2 ... and it will do just that. But lets say I want to change something fundamental about a file For example during this days advent of code challenge I wanted Items to be represented as objects. Say I want copilot to rewrite the entire flie to use an Array for each item instead of my current Interface. In principle that should be possible with GPT3 - How would you approach that?