Angular Service: Circular Dependency Problem Explained

Greetings, I am fairly new to the realm of Angular and have some background in AngualarJS (not very helpful here hahaha).

Currently, I am referring to this resource to implement a Service/State for a specific Module.

However, when attempting to use it within the same module, I encounter a circular dependency issue with the message:

Warning: Circular dependency detected

I'm puzzled about how to effectively utilize the providedIn property to specify a Module if this error persists.

home-store.service.ts

import { Injectable } from '@angular/core';
import { HomeModule } from './home.module';

export interface IHomeState {
  user?: any;
}

@Injectable({ providedIn: HomeModule }) // My intention is to confine this service to HomeModule
export class HomeStoreService {}

home-module.ts

import { CommonModule } from '@angular/common';
import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { HomeComponent } from './home.component';

@NgModule({
  declarations: [HomeComponent],
  imports: [CommonModule, RouterModule.forChild([])],
})
export class HomeModule {}

home-component.ts

import { Component } from '@angular/core';
import { HomeStoreService } from './home-store.service';

@Component({
  selector: 'home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.scss'],
})
export class HomeComponent {
  constructor(private homeStore: HomeStoreService) {}
}

Thank you for your assistance in advance.

Answer №1

It is advisable not to utilize the providedIn attribute, as it is unnecessary in this scenario. Therefore, you can modify your code in the following way to achieve the same outcomes.

home-store.service.ts

export interface IHomeState {
  user?: any;
}

export class HomeStoreService {}

home-module.ts

import { CommonModule } from '@angular/common';
import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { HomeComponent } from './home.component';
import { HomeStoreService } from 'path/to/service';

@NgModule({
  declarations: [HomeComponent],
  imports: [CommonModule, RouterModule.forChild([])],
  providers: [HomeStoreService]
})
export class HomeModule {}

home-component.ts Without alterations

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