Just found this debugger...

[Vladimir Panteleev]

On Wednesday, 3 October 2018 at 03:25:04 UTC, solidstate1991 
wrote:
> and I don't want to go back to VisualD after VSCode for either 
> a usable mago or VS native debug.

Visual Studio makes a decent stand-alone source-level debugger. 
Just select the .exe file, and right-click it in the 
project/solution pane to start a debugging session. (Of course, 
you need to build with -m32mscoff or -m64 as well as -g). VisualD 
isn't even needed, though VS by itself won't understand D types 
like arrays/strings.