Unable to theme the sockets of nodes.
Please use map the sockets to the corresponding node colors:
Color socket to Node Editor > Color Node
Vector socket to Node Editor > Vector Node
Shader socket to Node Editor > Shader node
I don’t know yet what will be the best color to use for the Number socket since there is really no such node. I’m thinking the Node Editor > Wires color makes the most sense if we don’t want to add an extra option in the Theme Editor. Any thoughts?
And does anyone know what the Node Editor > Selected Text controls?