dreyliky / ngx-local-injector

The function injectLocal allows you to inject a dependency without adding it to the providers.

Local Injector 🪄 [Angular 14+]

The function injectLocal allows you to inject a dependency without adding it to the providers.

Use for local dependencies you need only in the specific class as low-level dependencies.

Install

npm i ngx-local-injector

Why?

Allows you better encapsulate your low-level Injectable dependencies.

Description

Works in context of Component, Directive, Injectable, Pipe, Module.

Examples

Organize your Service following the Single Responsibility principle and with encapsulation of low-level services:

window.service.ts

import { injectLocal } from 'ngx-local-injector';
import {
    WindowOrderingService,
    WindowCoordinatesService,
    WindowActivityService,
    WindowConfigService
} from './my-private-services';

/** @public */
@Injectable()
export class WindowService {
    // Each of these services will be injected
    // in the context of our WindowService.
    // You don't need to add these services to the providers.
    private readonly orderingService = injectLocal(WindowOrderingService);
    private readonly coordinatesService = injectLocal(WindowCoordinatesService);
    private readonly activityService = injectLocal(WindowActivityService);
    private readonly configService = injectLocal(WindowConfigService);

    constructor() {
        // All your private services available here
        console.log(this.orderingService);
    }

    public create(): void {
        this.orderingService.doSomething();
        this.coordinatesService.doSomething();
        this.activityService.doSomething();
        this.configService.doSomething();
    }
}

window-ordering.service

import { OPENED_WINDOW } from '../tokens';
import { DynamicWindow } from '../interaces';

/** @private */
@Injectable()
export class WindowOrderingService {
    constructor(
        // You can use default DI features as well
        @Inject(OPENED_WINDOW) private readonly openedWindow: DynamicWindow
    ) {}
}

Provide single public WindowService on some level, instead of providing all those services.

So, in this case all other services will be private.

window.module.ts

@NgModule({
    providers: [WindowService]
})
export class WindowModule {}