async createUser() {
  try {
    await this.$fireAuth.createUserWithEmailAndPassword(
      'foo@foo.foo',
      'test'
    )
  } catch (e) {
    alert(e)
  }
}

This will throw a password error coming from Firebase, but proves the point.

async writeToFirestore() {
  const messageRef = this.$fireStore.collection('message').doc('message')
  try {
    await messageRef.set({
      message: 'Nuxt-Fire with Firestore rocks!'
    })
  } catch (e) {
  alert(e)
  return
  }
  alert('Success.')
}
      

async readFromFirestore() {
  const messageRef = this.$fireStore.collection('message').doc('message')
  try {
    const messageDoc = await messageRef.get()
    alert(messageDoc.data().message)
  } catch (e) {
  alert(e)
  return
  }
}

Might take some seconds.

async callTestFunction() {
  try {
    const res = await this.$fireFunc.httpsCallable('testFunction')()
    alert(res.data)
  } catch (e) {
    alert(e)
    return
  }
}

async writeToRealtimeDb() {
  const messageRef = this.$fireDb.ref('message')
  try {
    await messageRef.set({
      message: 'Nuxt-Fire with Firebase Realtime Database rocks!'
    })
  } catch (e) {
    alert(e)
    return
  }
  alert('Success.')
}

async readFromRealtimeDb() {
  const messageRef = this.$fireDb.ref('message')
  try {
    const snapshot = await messageRef.once('value')
    alert(snapshot.val().message)
  } catch (e) {
    alert(e)
    return
  }
}

async uploadFile() {
  const storageRef = this.$fireStorage.ref().child('message.txt')
  const message = 'Nuxt-Fire with Firebase Storage rocks!'
  try {
    const snapshot = await storageRef.putString(message)
    alert('File uploaded.')
  } catch (e) {
    alert(e.message)
  }
}
      

async getFileUrl() {
  const storageRef = this.$fireStorage.ref().child('message.txt')
  try {
    const url = await storageRef.getDownloadURL()
    alert(`The file can be found here: ${url}`)
  } catch (e) {
    alert(e.message)
  }
}
      

async logEvent() {
  try {
    await this.$fireAnalytics.logEvent('analytics_button_clicked')
  } catch (e) {
    alert(e)
  }
}

This will log an event in Firebase Analytics.

async readRemoteConfig() {
  try {
    await this.$fireConfig.fetchAndActivate();
  } catch (e) {
  alert(e);
  return;
  }
  const exampleMessage = await this.$fireConfig.getValue("exampleMessage");
  alert(
  `Success. Read RemoteConfig parameter 'exampleMessage' is: ${exampleMessage._value}`
  );
}