class myNs.MyClass, header: "my_macro.h":
   proc myMethod: void

## Generates
type MyClass {.header: "my_macro.h", importc: "myNs::MyClass".} = object


## Or
using myNs
class MyClass, header: "my_macro.h":
   proc myMethod: void

## Generates
{.emit: "using namespace myNs;".}
type MyClass {.header: "my_macro.h", importc: "MyClass".} = object