testing/web-platform/tests/workers/support/post-message-on-load-worker.js


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if ('DedicatedWorkerGlobalScope' in self &&
    self instanceof DedicatedWorkerGlobalScope) {
  postMessage('LOADED');
} else if (
    'SharedWorkerGlobalScope' in self &&
    self instanceof SharedWorkerGlobalScope) {
  self.onconnect = e => {
    e.ports[0].postMessage('LOADED');
  };
}