Firestoreでドキュメントに一括で書き込む（500件を超える場合にも対応） - Qiita

const admin = require('firebase-admin'); admin.initializeApp(); const firestore = admin.firestore(); async function updateDocuments(collectionName, batchSize = 500) { const collectionRef = firestore.collection(collectionName); const query = collectionRef.orderBy('timestamp').limit(batchSize); const documents = await query.get(); let batch = firestore.batch(); documents.forEach(document => { batch.