You are exporting the symbol * — this is not a wildcard, this is the name of the multiplication function.
Julia doesn’t have “wildcard” (globbing/pattern-matching) export and import, unlike Python.
Do export functionA, functionB explicitly in the module. To use all of the exported symbols of a module, do using .ModuleA
(Somebody did make a package ExportAll.jl to export everything from a module, but I don’t think it’s widely used.)