NgxSimpleSignalStore

A simple way to create signal stores with a read-only interface.

Compatibility with Angular Versions

ngx-simple-signal-store	Angular
2.x	>= 19
1.x	>= 18

Table of contents

• Installation
• Usage
  • Create global store
  • Create component store
• API

Installation

npm install ngx-simple-signal-store
# Or if you use yarn
yarn add ngx-simple-signal-store

Usage

Create global store

Add the store provider with an initial state and a unique token to your app.config.ts as a provider:

import { createInjectionToken, provideStore } from 'ngx-simple-signal-store';

export interface DemoState {
  theAnswerToLife: number;
}

export const initialDemoState: DemoState = {
  theAnswerToLife: 42
};

export const demoStateToken = createInjectionToken<DemoState>();

export const appConfig: ApplicationConfig = {
  providers: [
    provideStore(initialDemoState, demoStateToken),
  ],
};

Then, import and inject it into your components:

import { demoStateToken } from './app.config.ts';

@Component({})
export class DemoComponent {
  readonly #demoStore = inject(demoStateToken);
}

Create component store

Add the store provider with an initial state and a unique token to your component as a provider:

import { createInjectionToken, provideStore } from 'ngx-simple-signal-store';

export interface DemoComponentState {
  theAnswerToEverything: number;
}

export const initialDemoComponentState: DemoComponentState = {
  theAnswerToEverything: 42
};

export const demoComponentStateToken = createInjectionToken<DemoComponentState>();

@Component({
  providers: [provideStore(initialDemoComponentState, demoComponentStateToken)]
})
export class DemoComponent {
  readonly #demoComponentStore = inject(demoComponentStateToken);
}

API

T is the type of the state.

state: { [K in keyof T]: Signal<T[K]> };

const cookieExists: boolean = demoStore.state;

Return with the readonly state. The returned object keys are the referenced state keys, and the values are the read-only signals.

setState(key: K, data: T[K]): void;

demoStore.setState('key', 0);

Sets the state with a specified key and value.

patchState(key: K, data: T[K] | Partial<T[K]>): void;

// primitive:
demoStore.patchState('key', 0);
// The value before patch: 1
// The value after patch:  0

// array:
demoStore.patchState('key', [3]);
// The value before patch: [1, 2]
// The value after patch:  [1, 2, 3]

// object:
demoStore.patchState('key', {value: 0});
// The value before patch: {value: 1}
// The value after patch:  {value: 0}

Patch the state with a specified key and value.

A callback function can be used for the complex operations:

demoStore.patchState('key', state => ({value: state.value + 1}));

resetStore(): void;

demoStore.resetStore();

Reset the store to the initial state.