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useFirestore

packages/firebase/useFirestore/index.md

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useFirestore

Reactive Firestore binding. Making it straightforward to always keep your local data in sync with remotes databases.

Usage

ts
import { useFirestore } from '@vueuse/firebase/useFirestore'
import { initializeApp } from 'firebase/app'
import { collection, doc, getFirestore, limit, orderBy, query } from 'firebase/firestore'
import { computed, shallowRef } from 'vue'

const app = initializeApp({ projectId: 'MY PROJECT ID' })
const db = getFirestore(app)

const todos = useFirestore(collection(db, 'todos'))

// or for doc reference
const user = useFirestore(doc(db, 'users', 'my-user-id'))

// you can also use ref value for reactive query
const postsLimit = shallowRef(10)
const postsQuery = computed(() => query(collection(db, 'posts'), orderBy('createdAt', 'desc'), limit(postsLimit.value)))
const posts = useFirestore(postsQuery)

// you can use the boolean value to tell a query when it is ready to run
// when it gets falsy value, return the initial value
const userId = shallowRef('')
const userQuery = computed(() => userId.value && doc(db, 'users', userId.value))
const userData = useFirestore(userQuery, null)

Return Value

  • For Document Reference: Returns Ref<T | null> (single document with id property)
  • For Query: Returns Ref<T[]> (array of documents, each with id property)

The document id is automatically added as a read-only property to each returned document.

Options

OptionTypeDefaultDescription
errorHandler(err: Error) => voidconsole.errorCustom error handler
autoDisposeboolean | numbertrueAuto-unsubscribe on scope dispose. Pass a number for delayed dispose (ms).

Error Handling

ts
const todos = useFirestore(collection(db, 'todos'), [], {
  errorHandler: (err) => {
    console.error('Firestore error:', err)
    // Handle error (e.g., show notification)
  },
})

Share across instances

You can reuse the db reference by passing autoDispose: false. You can also set an amount of milliseconds before auto disposing the db reference.

Note : Getting a not disposed db reference again don't cost a Firestore read.

ts
import { useFirestore } from '@vueuse/firebase/useFirestore'
import { collection } from 'firebase/firestore'
// ---cut---
const todos = useFirestore(collection(db, 'todos'), undefined, { autoDispose: false })

or use createGlobalState from the core package

ts
// @filename: store.ts
// ---cut---
// store.ts
import { createGlobalState } from '@vueuse/core'
import { useFirestore } from '@vueuse/firebase/useFirestore'

export const useTodos = createGlobalState(
  () => useFirestore(collection(db, 'todos')),
)
vue
<!-- app.vue -->
<script setup lang="ts">
// @include: store
// ---cut---
import { useTodos } from './store'

const todos = useTodos()
</script>