Do you mean this?
help?> Core.TypeName
No documentation found.
Summary
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mutable struct Core.TypeName <: Any
Fields
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name :: Symbol
module :: Module
names :: Core.SimpleVector
wrapper :: Type
cache :: Core.SimpleVector
linearcache :: Core.SimpleVector
hash :: Int64
mt :: Any
julia> Base.typename(Vector{Int})
Array
julia> typeof(ans)
Core.TypeName
julia> Base.typename(Vector{Int}).wrapper
Array
julia> typeof(ans)
UnionAll
Core.TypeName.wrapper
seems to be what you want.