Actually re-reading the article, I see this: Currently not optimizable: Generator functions Functions that contain a for-of statement Function

Actually re-reading the article, I see this: Currently not optimizable: Generator functions Functions that contain a for-of statement Functions that contain a try-catch statement Functions that contain a try-finally statement Functions that contain a compound let assignment Functions that contain a compound const assignment Functions that contain object literals that contain __proto__, or get or set declarations. Likely never optimizable: Functions that contain a debugger statement Functions that call literally eval() Functions that contain a with statement Which I now realize is sort of what I'm looking for.