syncdoc.ts

import { doc, getFirestore } from "firebase/firestore"
import { defineStore } from "pinia"

type ExampleDoc = {
  name: string,
  age: number
}

export type State = {
  docData: ExampleDoc | null,
}

export const useExampleStore = defineStore('expamle', {
  state: (): State => {
    return {
      docData: null,
    }
  },
  actions: {
    async setup() {
      // Get Document reference
      const store = getFirestore()
      const docRef = doc(store, 'Examples/id')

      // Do the magic
      this.sync('docData', docRef)
    }
  }
})