Firestore のスナップショットをいい感じにキャッシュしてくれるライブラリの構想

findBooks.ts

import { getByQuery, strategies } from 'firestore-snapbox';

const maxEntries = 100;
const maxAgeSeconds = 60 * 60;
const expiredDate = new Date(2020, 0, 10, 15);
const snap = await getByQuery(query, strategies.CacheFirst, { maxEntries, maxAgeSeconds, expiredDate });

const books = snap.docs.map(doc => { ...doc, id: doc.id } as Book);