Utilize only the necessary components from firebase-admin in Cloud Functions with Typescript

When I looked at my transpiled code from cloud functions, I noticed the following TypeScript import:

import { auth, firestore } from 'firebase-admin';

It gets transpiled to:

const firebase_admin_1 = require("firebase-admin");

Upon further examination, I realized that this imports the entire admin library instead of just the necessary components, which may lead to longer cold start times.

I attempted to require only specific parts using require in my TypeScript code like so:

const { auth, firestore } = require('firebase-admin');

However, this approach causes it to lose its type definitions.

I wanted to inquire if there is a way to use only the required components from the firebase-admin library without compromising the TypeScript definitions.

typescriptfirebasegoogle-cloud-functionsfirebase-admin

Answer №1

firebase-admin is not your typical package as it operates as a monolithic entity. It essentially exports only one thing, which is the admin namespace. This means that you cannot selectively import specific parts of it. However, the package has cleverly implemented lazy loading mechanisms internally to ensure that only the components that developers actually use are loaded.

const admin = require('firebase-admin');
// The admin namespace is now imported, but none of the API services 
// have been loaded yet.

admin.auth();
// This triggers the loading of the Auth service code and any related dependencies.

admin.firestore();
// This brings in the @google-cloud/firestore package.

When working in an environment like Cloud Functions, this approach guarantees that only the essential source files and dependencies are loaded. Therefore, all you need to do is import the admin namespace and utilize its methods, letting the SDK handle the on-demand importing of required services/components.

Answer №2

When it comes to firebase-admin, the documentation does not mention such a thing because the firebase-admin SDK is designed for the server side.

However, there is a client SDK available for firebase.


const firebase = require('firebase/app');
require('firebase/auth');
require('firebase/firestore');

Based on your question, it seems like you are in need of the client SDK.

Answer №3

When you use `require('firebase-admin')` in your code (or import it in TypeScript), the entirety of the module will be loaded regardless of which symbols you choose to import. Selectively importing symbols from the library does not affect this behavior; it simply determines which symbols are accessible in your code. In JavaScript, optimizing by selecting specific symbols to import is not a valid optimization technique. Instead, focus on avoiding using unnecessary parts of the SDK to streamline your code.

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