Getting edge attribute in custom edge function

[vetertann]

I am trying to construct polyline edge from control points stored in edge attributes.
It is like this edges: [
{
source: '-1',
target: '1',
points: [
{ x: 475, y: 65 },
{ x: 475, y: 85 },
{ x: 366, y: 155 },
{ x: 366, y: 168 }
]

In version 4x it would work like this:

G6.registerEdge('custom-polyline', {
draw(cfg, group) {
const points = cfg.points;

Here I was trying the following:
class PolylineEdge extends BaseEdge {
getKeyPath(attributes) {
// Retrieve points from the edge's model
const points = attributes.model.points;

But it does not work.
Please advise.