import VueFire from '@vuefire/vuefire'

Vue.use(VueFire, {
  project: {
    apiKey: "<API_KEY>",
    authDomain: "<PROJECT_ID>.firebaseapp.com",
    databaseURL: "https://<DATABASE_NAME>.firebaseio.com",
    storageBucket: "<BUCKET>.appspot.com",
    messagingSenderId: "<SENDER_ID>",
    projectId: '<PROJECT_ID>',
  }
})

// In components
methods: {
    this.$firebase.database().ref('/users')
    this.$firebase.auth()
}

Vue.use(VueFire, {
  project: {
    // ...
  },
  mixins: [
      function specialFirebaseAction({firebase}, params){
        // What will you create ?
        console.log(params   ' I see you')
        return firebase.auth().currentUser
      }
  ]
})

// in components
computed: {
  user() {
    this.$firebase.specialFirebaseAction('params')
  }
}

import VueFire from '@vuefire/vuefire'

Vue.use(VueFire, {
  project: {
    apiKey: "<API_KEY>",
    authDomain: "<PROJECT_ID>.firebaseapp.com",
    databaseURL: "https://<DATABASE_NAME>.firebaseio.com",
    storageBucket: "<BUCKET>.appspot.com",
    messagingSenderId: "<SENDER_ID>",
    projectId: '<PROJECT_ID>',
  },
  vuex: {
    namespaces: ['firebase'],
    store: store
  }
})

// firebase namespaced module
export default {
  namespaced: true,
  /**
    * ...your state, getter, and mutations are here
    */  
  actions: {
    // and now the magic
    saveToFirebase ({commit, rootState, state}, {firebase, database}, payload) {
      // firebase.database() or just
      database().ref('a/path/on/firebase'). // you know the rest
    }
  }
}

// just add 'root' to namespaces array to have your root action have a firebase parameter
vuex: {
  namespaces: ['root', 'firebase'],
  store: store
}