@magnetarjs/plugin-firestore-admin/dist/actions/fetchCount.js

Magnetar plugin firestore-admin

import { getFirestoreCollectionPath } from '@magnetarjs/utils-firestore';
import { getQueryInstance } from '../helpers/getFirestore.js';
export function fetchCountActionFactory(firestorePluginOptions) {
    return async function ({ collectionPath, pluginModuleConfig, }) {
        const { db } = firestorePluginOptions;
        // in case of a doc module
        const _collectionPath = getFirestoreCollectionPath(collectionPath, pluginModuleConfig, firestorePluginOptions); // prettier-ignore
        const queryInstance = getQueryInstance(_collectionPath, pluginModuleConfig, db);
        // see https://firebase.google.com/docs/firestore/query-data/aggregation-queries#use_the_count_aggregation
        const querySnapshot = await queryInstance.count().get();
        const count = querySnapshot.data().count;
        return count;
    };
}