Cloud Firestore

エラー内容

TypeError: firebase_compat_app__WEBPACK_IMPORTED_MODULE_0__.default.firestore is not a function

import firebase from "firebase/app";
import "firebase/firestore";
import firebaseConfig from "./config";

firebase.initializeApp(firebaseConfig);
export const db = firebase.firestore();

修正後

import firebase from "firebase/compat/app";
import "firebase/compat/firestore";
import firebaseConfig from "./config";

firebase.initializeApp(firebaseConfig);
export const db = firebase.firestore();