yEd Live postMessage GraphML

send-graphml.ts

const YED_LIVE_URL = 'https://www.yworks.com/yed-live/'
const yedLive = window.open(YED_LIVE_URL)!

// wait for page load before sending the data (i.e. 'yed-live-listening')
const messageHandler = async (e: MessageEvent) => {
  if (
	YED_LIVE_URL.startsWith(e.origin) &&
	e.data === 'yed-live-listening'
  ) {
	// send the actual graphml
	setTimeout(async () => {
	  yedLive.postMessage(
		{
		  source: 'an-external-application-name', // a hint to where it came from
		  graphml: '<?xml ...... >',
		},
		YED_LIVE_URL
	  )
	}, 500)
  }
  window.removeEventListener('message', messageHandler)
}
window.addEventListener('message', messageHandler)