js/xpconnect/tests/mochitest/private_field_worker.js


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class A {
  #x;

  g(o) {
    return #x in o;
  }
}

let objects = [];

self.onmessage = function (e) {
  if (e.data === 'allocate') {
    objects.push(new A);
    return;
  }
  if (e.data == 'count') {
    postMessage(objects.length);
    return;
  }
  postMessage('Unknown message type.');
}