How to manage circular dependencies in Angular services using dependency injection

Question

Can i know How to manage circular dependencies in Angular services using dependency injection?

Answer 1

Circular dependencies arise when multiple services rely on one another, forming a loop that Angular's dependency injection system cannot resolve. Here's how to address them:

Use Angular's @Inject and forwardRef

// service-a.service.ts

import { Injectable, Inject, forwardRef } from '@angular/core';

import { ServiceB } from './service-b.service';

@Injectable()

export class ServiceA {

  constructor(@Inject(forwardRef(() => ServiceB)) private serviceB: ServiceB) {}

}



// service-b.service.ts

import { Injectable, Inject, forwardRef } from '@angular/core';

import { ServiceA } from './service-a.service';

@Injectable()

export class ServiceB {

  constructor(@Inject(forwardRef(() => ServiceA)) private serviceA: ServiceA) {}

}