testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/broadcastchannel-sharedworker.js


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const channel = new BroadcastChannel("anne was here");
channel.onmessageerror = ({ data }) => {
  if(data === null) {
    channel.postMessage("sw-success");
  }
}
channel.postMessage("hi");