ngx-fire

A small, declarative, signal-based way to work with Firebase in Angular. It uses Angular signals for ergonomic state and real-time updates. Today it focuses on Firestore; Auth support is planned ASAP.

Features

• Declarative signals for real-time Firestore data
• Minimal API surface
• Emulator support via configuration
• Auto-cleanup on component destroy

Install

From npm:

- npm install ngx-fire firebase

Peer requirements:

- Angular 17+ (works great with 18/19/20)
- Firebase JS SDK 10+

If you’re developing locally against the source (monorepo), map the library path in your root tsconfig instead of installing from npm:

{
  "compilerOptions": {
    "paths": {
      "ngx-fire": ["projects/ngx-fire/src/public-api.ts"]
    }
  }
}

Quick Start

1. Provide Firestore in your app config

   // app.config.ts import { ApplicationConfig } from '@angular/core' import { provideRouter } from '@angular/router' import { provideFirestore } from 'ngx-fire'

   export const appConfig: ApplicationConfig = { providers: [ provideRouter([]), provideFirestore({ firebaseConfig: { apiKey: '...', authDomain: '...', projectId: '...', appId: '...' }, // Optional: connect to emulator // useEmulator: true // or with options: // useEmulator: { host: 'localhost', port: 8080 } }) ] }

Supported config shapes:

// Simplest:
provideFirestore({ firebaseConfig })

// Enable emulator with defaults (localhost:8080):
provideFirestore({ firebaseConfig, useEmulator: true })

// Custom emulator:
provideFirestore({
  firebaseConfig,
  useEmulator: { host: '127.0.0.1', port: 8080 }
})

2. Use injectCollection in a component

   import { Component, ChangeDetectionStrategy } from '@angular/core' import { injectCollection } from 'ngx-fire'

   type Post = { id: string title: string content: string createdAt: Date }

   @Component({ selector: 'app-posts', template: ` @if (posts.error()) {

   Error: {{ posts.error()?.message }}

   }

    <ul>
      @for (p of posts.data(); track p.id) {
        <li>{{ p.title }} — {{ p.content }}</li>
      }
    </ul>
   
    <button (click)="add()">Add</button>
   

   `, changeDetection: ChangeDetectionStrategy.OnPush }) export class PostsComponent { posts = injectCollection('posts')

   async add() { await this.posts.insert({ title: 'Hello', content: 'World', createdAt: new Date() }) } }

API

provideFirestore(config)

Initializes Firebase App and registers a Firestore instance in Angular DI.

• firebaseConfig: FirebaseOptions

• useEmulator:

  • boolean — true uses localhost:8080
  • { host?: string; port?: number } — custom emulator Examples:

  provideFirestore({ firebaseConfig }) provideFirestore({ firebaseConfig, useEmulator: true }) provideFirestore({ firebaseConfig, useEmulator: { host: 'localhost', port: 8080 } })

injectCollection(collectionPath: string)

Subscribes to a Firestore collection with real-time updates and exposes signals.

Returns:

• data: ReadonlySignal<T[]>

• error: ReadonlySignal<Error | null>

• hasError: ReadonlySignal

• insert(doc: Omit<T, 'id'>): Promise

• update(id: string, changes: Partial): Promise

• remove(id: string): Promise Notes:

• Each document in data() includes id as a field.

• Timestamps are normalized to Date for template friendliness.

• Cleanup happens automatically on component destroy. Example:

  type Todo = { id: string; title: string; done: boolean; createdAt: Date }

  const todos = injectCollection('todos')

  todos.data() // Todo[] todos.error() // Error | null todos.hasError() // boolean

  await todos.insert({ title: 'Buy milk', done: false, createdAt: new Date() }) await todos.update('docId', { done: true }) await todos.remove('docId')

Using Zod (optional)

import { z } from 'zod'

const PostSchema = z.object({
  id: z.string(),
  title: z.string(),
  content: z.string(),
  createdAt: z.date()
})

type Post = z.infer<typeof PostSchema>

const posts = injectCollection<Post>('posts')

Validation at runtime is up to you; ngx-fire uses the inferred types for compile-time safety.

Firestore Emulator with Docker (optional)

version: '3.8'
services:
  firebase-emulator:
    image: google/cloud-sdk:emulators
    command: >
      bash -lc "
      gcloud config set project your-project &&
      gcloud beta emulators firestore start --host-port=0.0.0.0:8080 --quiet
      "
    ports:
      - '8080:8080'

Start:

docker compose up -d

Enable in app:

provideFirestore({ firebaseConfig, useEmulator: true })

Roadmap

• Firebase Auth support with signal-based session state
• Document-level helpers (injectDoc)
• Query helpers (constraints, pagination)
• Transaction and batch utilities

License

MIT