Why did firestore move from firestore.collection() to collection(firestore)?-CodePudding

It used to be

db.collection("customersData").add({
      name: customerName,
      password: customerPassword,
    });

Now it is

async function getCities(db) {
  const citiesCol = collection(db, 'cities');
  const citySnapshot = await getDocs(citiesCol);
  const cityList = citySnapshot.docs.map(doc => doc.data());
  return cityList;
}

And you have to import the methods seperately import { getFirestore, collection, getDocs } from 'firebase/firestore/lite';.

What was the reason for this?
Is it possible to use the old way of writing still?

CodePudding user response：

What was the reason for this?

You can read about it in the release notes for version 9.

This release introduces the new modular API, which enables tree-shaking, bundle size reduction, and other benefits. See SDK versions 8 and 9 for more details.

Is it possible to use the old way of writing still?

Yes, you can use any prior version of the SDK before the changes in 9.