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

Magnetar plugin firestore-admin

import { getFirestoreCollectionPath } from '@magnetarjs/utils-firestore';
import { AggregateField } from 'firebase-admin/firestore';
import { getQueryInstance } from '../helpers/getFirestore.js';
export function fetchAggregateActionFactory(kind, firestorePluginOptions) {
    return async function ({ payload, 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#web-modular-api_2
        const querySnapshot = await queryInstance
            .aggregate({
            TEMP_FIELD_NAME: kind === 'sum' ? AggregateField.sum(payload) : AggregateField.average(payload),
        })
            .get();
        const result = querySnapshot.data()['TEMP_FIELD_NAME'];
        return result;
    };
}