IEdge

// add label with given text, default style, and default placement
// and determine the preferred size automatically

const label1 = graph.addLabel(node, 'Some Label')

// add label with given text, placement, style, size, and tag (user object)
const label2 = graph.addLabel(
  node,
  'Some Label',
  InteriorNodeLabelModel.CENTER,
  new LabelStyle(),
  new Size(10, 150),
  userObject,
)

// add label with given text and style but default placement
// and determine the preferred size automatically
const label3 = graph.addLabel({
  owner: node,
  text: 'Some Label',
  style: new LabelStyle(),
})

for (const label of node.labels) {
  // ...
}

graph.remove(label)

// add a port at x,y with default style
const port1 = graph.addPortAt(node, new Point(x, y))

const portStyle = new ShapePortStyle({
  shape: ShapeNodeShape.ELLIPSE,
  renderSize: new Size(3, 3),
})

// add a port at x,y with the given style and tag (user object)
const port2 = graph.addPortAt(
  node,
  new Point(x, y),
  portStyle,
  userObject,
)

// add a port at the center of the node with default style
const port3 = graph.addPort(node, FreeNodePortLocationModel.CENTER)

// add a port at the center of the node with the given style and tag (user object)
const port4 = graph.addPort(
  node,
  FreeNodePortLocationModel.CENTER,
  portStyle,
  userObject,
)

for (const port of node.ports) {
  // ...
}

graph.remove(port)

const sourcePort = edge.sourcePort

const sourceNode = edge.sourceNode
// is the same as
const sameSourceNode = edge.sourcePort.owner

graph.setEdgePorts(edge, newSourcePort, newTargetPort)

graph.setStyle(edge, new PolylineEdgeStyle())

const style = edge.style

owner.tag = newTag

const tag = owner.tag