ok, I got it . I will check it as soon as possible.

butterfly-dag@4.3.28 has fix it.

You can call 'edge.getBreakPoints' to get edge breakpoints data and save to backend. Next time draw you dag , you can put breakpoints data to you edge data, for example

canvas.draw({
  nodes: [],
  edges: [{id: 1, breakpoints:[...]}]
})

Can I get breakpoints and the edge info by dragging the edge with React? I don't use canvas.draw and I don't understand how to use 'edge.getBreakPoints' . I provide the state with options, edges, nodes as configuredData like this:

<ReactButterfly
	ref={ref}
	onCreateEdge={handleEdgeCreate}
	{...configuredData}
/>

Also I can see some info inside ref.current.canvas. But I can't get any info about Edge on the drag event, because it is simple without id or data attributes.

UPD:
ref.current.canvas.edges[index].getBreakPoints() works, but I still don't understand how to get the current dragged edge. Recording of whole edges array maybe a resolve.

em....We will abandone react-butterfly , I recommend you use butterfly-dag.

That's a pity(
Is it possible to use functional react components of nodes and edges inside batterfly-dag classes?
For example, I will use Node class:

const Node = require('butterfly-dag').Node;
class ANode extends Node {
  draw(obj) {
    // here my functional react logic
   
   return <CustomNode {...someProps} />
  }
}

or, I still use React-Butterfly, but I will use {Edge} from 'butterfly-dag' and provide edge data to React-Butterfly like this:

class СustomBaseEdge extends Edge {
	draw(obj) {
		let path = super.draw(obj);
		$(path).addClass('test-base-link');
		return path;
	}
}

edgeItem: {
	sourceNode: //
	targetNode: //
	source: //
	target: //
	id: //
	Class: СustomBaseEdge
}

it seems, it doesn't fully work