/* App */
const myWorker = new SharedWorker('script.js');

myWorker.port.onmessage
        .port.postMessage

/* SharedWorker */ 


// self -- is the workers-scope
onconnect = function (e) {
  var newPort = e.ports[0];
  
  newPort.onmessage = function (e) {
   //Incoming message
  }

  newPort.postMessage('Outgoing message');
}