The edge type variant to get a label for
Short label string, or undefined for None edge type
edgeLabel({ type: "array_element", index: 0 }); // Returns "arr[0]"
edgeLabel({ type: "map_key_value" }); // Returns "kv"
edgeLabel({ type: "map_key" }); // Returns "key"
edgeLabel({ type: "map_value" }); // Returns "val"
edgeLabel({ type: "tagged_content" }); // Returns "content"
edgeLabel({ type: "none" }); // Returns undefined
Returns a short text label for the edge type, or undefined if no label is needed.
This is primarily used for tree formatting to identify relationships between elements.