electron-node-red/appdmg.json

{
  "title": "Node-RED installer",
  "icon": "nodered.icns",
  "background": "appbkg.png",
  "icon-size": 80,
  "contents": [
    { "x": 448, "y": 344, "type": "link", "path": "/Applications" },
    { "x": 192, "y": 344, "type": "file", "path": "build/Node-RED-darwin-x64/Node-RED.app" }
  ]
}