poll.js

import { useTask, timeout } from 'vue-concurrency; 

export default defineComponent({
setup() {
  const weatherData = ref(null);
  const pollTask = useTask(function*() {
    while (true) {
      weatherData.value = yield ajax('/api/weather');
      yield timeout(5000); // wait 5s
    }
  }).drop();
  
  pollTask.perform();

  return { pollTask, weatherData, pause, resume };
}
});