@rx-angular/state

Description

@rx-angular/state is a library designed to help developers effectively manage component-level state in Angular. It offers a lightweight and intuitive API and automatic subscription handling, making it a perfect solution for handling state in any Angular component, service or directive. This library offers unique features such as merging global state into local state, shared state selections, subscription-free interaction, and integration with imperative functions like component lifecycle and HostBindings. It is an ideal alternative or complimentary library to global state management solutions like Akita, NgRx, and NgXs.

Key features

• ⚡️ Fully reactive
• 🛡️ Strongly typed
• 🚀 Highly performant

Introduction Video

Installation

npm install @rx-angular/state

Usage

Functional Creation (NEW)

The new functional creation API lets you create and configure RxState in only one place.

import { rxState } from '@rx-angular/state';
import { RxFor } from '@rx-angular/template/for';

@Component({
  template: `<movie *rxFor="let movie of movies$" [movie]="movie" />`,
  imports: [RxFor],
})
export class MovieListComponent {
  private movieResource = inject(MovieResource);

  private state = rxState<{ movies: Movie[] }>(({ set, connect }) => {
    // set initial state
    set({ movies: [] });
    // connect data source to state
    connect('movies', this.movieResource.fetchMovies());
  });

  // select a property for the template to consume as an observable
  movies$ = this.state.select('movies');
  // select a property for the template to consume as a signal
  movies = this.state.signal('movies');
}

The functional approach will be the new default approach for newer versions.

Read the Migration Guide for a migration guide explaining how to upgrade your codebase to the new API.

Class Based

Local Provider: Use RxState as a local provider in your component to make use of Angular's Dependency Injection.

With the new inject method:

@Component({
  /*...*/
  providers: [RxState],
})
export class RxStateInjectionComponent {
  private state: RxState<{ foo: string }> = inject(RxState);

  state$ = this.state.select();
}

With constructor based injection:

@Component({
  /*...*/
  providers: [RxState],
})
export class RxStateInjectionComponent {
  state$ = this.state.select();

  constructor(private state: RxState<{ foo: string }>) {}
}

Inheritance: Use RxState by extending it in your component.

@Component({
  /*...*/
})
export class RxStateInheritanceClass extends RxState<{ foo: string }> {
  value$ = this.select();
}

• 📄 Detailed Usage Documentation
• 🧪 Extensive Testing Guide

API overview

With @rx-angular/state, you can easily manage your component state with a range of powerful methods. You can find a detailed API documentation here.

Addons

The following complimentary tools are recommended for use with RxState to improve the development experience and optimize application performance.

🚀 @rx-angular/template

Reduce the amount of boilerplate code required in templates and bring rendering performance to next level.

⚒️ @rx-angular/state/effects

Reactively handle side effects, forget about the subscribe API and potential memory leaks.

📡 @rx-angular/state/actions

Create composable action streams for user interaction and backend communication with a minimal memory footprint.

✨ @rx-angular/cdk/transformations

Simplify data structures management. Create, modify, convert arrays and objects with ease.

🔬 @rx-angular/eslint-plugin

Enforce best practices for building reactive, performant, and Zone-less Angular applications.

🧩 Selections

Optimize state selections and data transfer, ensure only the necessary data is transferred.

Version Compatibility

| RxAngular | Angular | | --------- | ---------- | | ^1.0.0 | >=12.0.0 | | ^2.0.0 | >=13.0.0 | | ^14.0.0 | ^14.0.0 | | ^15.0.0 | ^15.0.0 | | ^16.0.0 | ^16.0.0 |

Regarding the compatibility with RxJS, we generally stick to the compatibilities of the Angular framework itself, for more information about the compatibilities of Angular itself see the official guide.

Contribution

If you want to contribute to this project, please follow our guideline.

Additional materials

• 💾 Research on Reactive Ephemeral State
• 📜 Design Documents
• ✍️Tutorials
• 🍳 Recipes
• 💻Counter Demo
• 🎥 Tackling Component State Reactively (Live Demo at 24:47)
• 🎥 Extending Angular for the Reactive Web
• 🎥 Michael explains rx-state to webdave_de (Livestream, German)

OSS Example Applications

• ‍💻 Fully-reactive Zone-Less Angular/Ionic Progressive Web Application - Mike Hartington
• ‍💻 High performant zone-Less Angular Progressive Web Application - TasteJS
• ‍💻 Zone-Less Angular Application - Tour of heroes - Michael_Hladky
• ‍💻 Zone-Less Todo MVC - Edouard Bozon