map -package:containers -package:base-prelude -package:basement -package:case-insensitive -package:aeson -package:imports -package:amazonka-core -package:base -package:base-compat -package:os-string -package:conduit -package:pipes -package:insert-ordered-containers -package:psqueues -package:text -package:filepath -package:dense-linear-algebra -package:invertible -package:unordered-containers -is:exact -package:bytestring -package:vector is:module package:optics-core

This module defines mapping, which turns an Optic' k NoIx s a into an Optic' (MappedOptic k) NoIx (f s) (f a), in other words optic operating on values in a Functor.