How to discover all package types at runtime?

Question

As far as I\'m aware (see here, and here) there is no type discovery mechanism in the reflect package, which expects that you already have an instance of the type or value y

Answer 1

Unfortunately, I don't think this is possible. Packages are not "actionable" in Go, you can't "call a function" on it. You can't call a function on a type either, but you can call reflect.TypeOf on an instance of the type and get reflect.Type which is a runtime abstraction of a type. There just isn't such mechanism for packages, there isn't a reflect.Package.

With that said, you could file an issue about the absence of (and practicality of adding) reflect.PackageOf etc.