ionRefresh event does not work

Hello, i ve tried to use ion-refresher, here is simple code from my project(95% of it is from documentation) so @ionRefresh=“doRefresh($event)” not even triggered

<template>
  <ion-page>
    <ion-content>
      <ion-refresher slot="fixed" @ionRefresh="doRefresh($event)">
        <ion-refresher-content></ion-refresher-content>
      </ion-refresher>
      Hello
    </ion-content>
  </ion-page>
</template>

<script>
import { IonContent, IonRefresher, IonRefresherContent } from '@ionic/vue';
import { chevronDownCircleOutline } from 'ionicons/icons'
import { defineComponent } from 'vue';

export default defineComponent({
  components: { IonContent, IonRefresher, IonRefresherContent },
  setup() {
    const doRefresh = (event) => {
      console.log('Begin async operation');

      setTimeout(() => {
        console.log('Async operation has ended');
        event.target.complete();
      }, 2000);
    }
    return { chevronDownCircleOutline, doRefresh }
  }
});
</script>

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