Try names(module_name) :
help?> names
search: names fieldnames propertynames nameof NamedTuple dirname tempname fullname basename fieldname gethostname
names(x::Module; all::Bool = false, imported::Bool = false)
Get an array of the names exported by a Module, excluding deprecated names. If all is true, then the list also
includes non-exported names defined in the module, deprecated names, and compiler-generated names. If imported is
true, then names explicitly imported from other modules are also included.