@skunkteam/google-cloudevents-firestore

This module provides pre-compiled JavaScript classes and TypeScript types for decoding Google Cloud Events from Firestore, simplifying the development of Cloud Functions that respond to Firestore events.

Motivation

When building Google Cloud Functions triggered by Firestore events, you receive CloudEvents with binary payloads containing protobuf-encoded Firestore event data. Google's documentation suggests compiling protobuf decoders at runtime, which introduces complexities:

• You need to include .proto files in your application bundle.
• Runtime compilation adds overhead and potential errors.
• The resulting JavaScript classes lack TypeScript type definitions, hindering development and maintainability.

Solution

@skunkteam/google-cloudevents-firestore addresses these issues by:

1. Pre-compiling protobuf definitions: The necessary .proto files are compiled into JavaScript classes during the module's build process.
2. Including TypeScript types: Type definitions are generated alongside the JavaScript classes, providing a fully typed development experience.
3. Simplifying usage: You can directly import and use the pre-compiled classes in your Cloud Functions, eliminating runtime compilation and the need to manage .proto files.

This approach streamlines the development of Firestore-triggered Cloud Functions, improving code clarity, reducing errors, and enhancing maintainability.

Example Usage

import * as functions from '@google-cloud/functions-framework';
import { google } from '@skunkteam/google-cloudevents-firestore';
import assert from 'node:assert';

functions.cloudEvent('onTaskCreate', async function onTaskCreate(cloudEvent: functions.CloudEvent<Buffer>) {
    console.log(`Function triggered by event on: ${cloudEvent.source}`);
    console.log(`Event type: ${cloudEvent.type}`);

    console.log('Decoding data...');
    assert(Buffer.isBuffer(cloudEvent.data));
    const firestoreReceived = google.events.cloud.firestore.v1.DocumentEventData.decode(cloudEvent.data);

    console.log('\nOld value:');
    console.log(JSON.stringify(firestoreReceived.oldValue, null, 2));

    console.log('\nNew value:');
    console.log(JSON.stringify(firestoreReceived.value, null, 2));
});

Installation

npm install @skunkteam/google-cloudevents-firestore