@magnetarjs/plugin-firestore/dist/actions/fetchAggregate.js

Magnetar plugin firestore

import { getFirestoreCollectionPath } from '@magnetarjs/utils-firestore';
import { average, getAggregateFromServer, sum } from 'firebase/firestore';
import { getQueryInstance } from '../helpers/getFirestore.js';
export function fetchAggregateActionFactory(kind, firestorePluginOptions) {
    return async function ({ payload, collectionPath, pluginModuleConfig, }) {
        const { db, debug } = firestorePluginOptions;
        // in case of a doc module
        const _collectionPath = getFirestoreCollectionPath(collectionPath, pluginModuleConfig, firestorePluginOptions); // prettier-ignore
        const query = getQueryInstance(_collectionPath, pluginModuleConfig, db, debug);
        // see https://firebase.google.com/docs/firestore/query-data/aggregation-queries#web-modular-api_2
        const querySnapshot = await getAggregateFromServer(query, {
            TEMP_FIELD_NAME: kind === 'sum' ? sum(payload) : average(payload),
        });
        const result = querySnapshot.data()['TEMP_FIELD_NAME'];
        return result;
    };
}