firebase存储:存储.ref不是函数

所以我看了医生的报告 https://firebase.google.com/docs/storage/web/start

我确实:

管理员.js

const admin = require('firebase-admin');
const config = require('./config.js');

admin.initializeApp(config);

const db = admin.firestore();
const storage = admin.storage();

module.exports = { admin, db, storage };

const { admin, db, storage } = require('../util/admin');

exports.postAvatar = async (request, response) => {

  const storageRef = storage.ref();

}

但我有以下错误: storage.ref is not a function

文件中有什么遗漏吗?

Storage {
  INTERNAL: StorageInternals {},
  storageClient: Storage {...},
  appInternal: FirebaseApp {...}
}