type `configUnion` is confusing, fed into layout function?

[ajvincent]

Playground Link

The intersection type is a bit confusing. I'm new to dagre, and I see the width and height types on three different interfaces. So what is the width property of the configUnion applied to - the graph, the nodes, or the edges?

If it was something like this:

export interface ConfigInterface {
  graphConfig: GraphLabel;
  defaultNodeConfig: NodeConfig;
  defaultEdgeConfig: EdgeConfig
  layoutConfig: LayoutConfig
}

that would make sense.

I'm just confused by this type definition.