如何在firestore / nodejs中存储/使用Decimal和money值

const admin = require('firebase-admin');
admin.initializeApp();

const db = admin.firestore();

async function saveMoney(userId, amountInCents) {
  await db.collection('users').doc(userId).set({
    balance: BigInt(amountInCents)
  });
}

async function getMoney(userId) {
  const userDoc = await db.collection('users').doc(userId).get();
  if (userDoc.exists) {
    return userDoc.data().balance;
  }
  return null;
}

npm install decimal.js

const Decimal = require('decimal.js');

async function saveDecimal(userId, decimalValue) {
  const decimal = new Decimal(decimalValue);
  await db.collection('users').doc(userId).set({
    value: decimal.toString()
  });
}

async function getDecimal(userId) {
  const userDoc = await db.collection('users').doc(userId).get();
  if (userDoc.exists) {
    const decimal = new Decimal(userDoc.data().value);
    return decimal.toNumber();
  }
  return null;
}