webworker example

example.worker.js

// example.worker.js
onmessage = e => {
  const data = JSON.parse(e.data);
  switch (data.type) {
    case 'init':
      // set up data or something
      break;
    case 'filter':
      // some long running task possibly
      const result = doSomethingAsyncOrWhatever(...);
      postMessage(result);
      break;
  }
}

// then in the component using it, following best practices from article
exampleWorker.postMessage(JSON.stringify({type: 'filter', message: 'whatever'});