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Lithium for Angular (@lithiumjs/angular)

Reactive components made easy! Lithium provides utilities that enable seamless reactive state and event interactions for Angular components.

Features

• Reactive component state

  Lithium's ComponentStateRef service exposes a type-safe representation of component state properties as Subjects, allowing for observation of the component's full state automatically:

import { ComponentState, ComponentStateRef } from '@lithiumjs/angular';

@Component({
    ...
    providers: [ComponentState.create(MyComponent)]
})
class MyComponent {

    public value = 0;

    constructor (stateRef: ComponentStateRef<MyComponent>) {
        stateRef.get('value').subscribe(value => console.log("value: ", value));

        this.value = 100;
    }

    // Output:
    // value: 0
    // value: 100
}

• Reactive lifecycle decorators

  Lithium adds support for reactive component events, including decorators for component lifecycle events:

import { OnInit } from '@lithiumjs/angular';

@Component({...})
class MyComponent {

    @OnInit() 
    private readonly onInit$: Observable<void>;

    constructor () {
        this.onInit$.subscribe(() => console.log("Reactive ngOnInit!"));
    }
}

• Works with Angular component decorators

  You can use Angular's built-in component decorators with Lithium. Use an @Input as a Subject and listen to a @HostListener event as an Observable!

• OnPush components made easy

  By tracking component state changes automatically, Lithium's AutoPush feature allows you to easily write more performant components using OnPush.

• Beyond async

  Lithium automatically manages subscription lifetimes just like Angular's async pipe, without its syntax overhead (and ugly workarounds).

Intro guide

Read through the intro guide to get to know Lithium's core features.

Example app - [Live demo]

The example todo list app showcases real-world usages of Lithium.

API reference

Full API documentation is available for Lithium.

Installation

Lithium can be installed via npm using the following command:

npm install @lithiumjs/angular

FAQ and Other information

If you are upgrading from Lithium 6.x or earlier, read through the migration guide to see how to updgrade your app to use the latest features from Lithium.

FAQ

Does Lithium support Ivy (the default rendering engine for Angular 9+)?

Lithium fully supports Ivy-based applications. Note: Please be aware that Lithium currently uses features from the not-yet finialized Ivy API, so some features of Lithium could stop working in later versions of Angular before Lithium is updated to support them.

Does Lithium support the ViewEngine (pre-Ivy) applications?

Lithium 5.x.x is the last major version that supports ViewEngine-based applications. Lithium 6.x.x and above only supports Ivy-based applications.

Other information

• Migration guide for migrating from Lithium 6.x and below to newer versions of Lithium.
• @lithiumjs/ngx-material-theming - A theming utility for Angular Material built with Lithium.