spec/fixtures/pages/shared_worker.html

<html>
<body>
<script type="text/javascript" charset="utf-8">
  const {ipcRenderer} = require('electron')
  // Pass a random parameter to create independent worker.
  let worker = new SharedWorker(`../workers/shared_worker_node.js?a={Math.random()}`)
  worker.port.onmessage = function (event) {
    ipcRenderer.send('worker-result', event.data)
  }
</script>
</body>
</html>