Multiline.vue

<template>
  <div class="q-pa-md">
    <q-btn color="purple" @click="showNotif" label="Show Notification" />
  </div>
</template>

<script>
import { useQuasar } from 'quasar'

export default {
  setup () {
    const $q = useQuasar()

    return {
      showNotif () {
        $q.notify({
          message: 'Lorem ipsum dolor sit amet, consectetur adipisicing elit. Hic quisquam non ad sit assumenda consequuntur esse inventore officia. Corrupti reiciendis impedit vel, fugit odit quisquam quae porro exercitationem eveniet quasi.',
          color: 'primary',
          multiLine: true,
          avatar: 'https://cdn.quasar.dev/img/boy-avatar.png',
          actions: [
            { label: 'Reply', color: 'yellow', handler: () => { /* ... */ } }
          ]
        })
      }
    }
  }
}
</script>