Angular 4 Circular dependency detected

As the warning says, work-session-list.routing.ts depends on index.ts:

import { WorkSessionListComponent } from './index';

And index.ts depends on work-session-list.routing.ts:

export * from './work-session-list.routing';

The first dependency is not necessary, since you could import WorkSessionListComponent directly from its source file:

import { WorkSessionListComponent } from './work-session-list.component';

This change should fix the problem.

Ján Halaša answer is correct. I wanna explain some stuff to make things clear.

index.ts should not be removed, it should still be used.

I had the same problem, in my case I had a cards main modules with many submodules within it. (based on https://medium.com/@tomastrajan/the-best-way-to-architect-your-angular-libraries-87959301d3d3)

so in my tsconfig.ts I had

"@com-tuxin/cards/*": [ "projects/cards/*", "projects/cards"],"@com-tuxin/cards": [ "dist/cards/*", "dist/cards"]

and under projects/cards/src/lib I have a directory for each off my modules, and each one of them has index.ts file.

the reason that I would get a circular dependencies warnings is because I would use barrels includes of a component in the same module that I'm in.

for example I had the sub-module article-card, and I had this code:

import { NgModule } from '@angular/core';import { CommonModule } from '@angular/common';import {ArticleCardComponent} from '@com-tuxin/cards/src/lib/article-card;import {MatCardModule} from '@angular/material/card';import {MatButtonModule} from '@angular/material/button';@NgModule({  declarations: [    ArticleCardComponent  ],  imports: [    CommonModule,    MatCardModule,    MatButtonModule,  ],  exports: [    ArticleCardComponent  ]})export class ArticleCardModule { }

so the problem is with import {ArticleCardComponent} from '@com-tuxin/cards/src/lib/article-card; since I'm in that exact module I should use exact path instead of barrels so I switched it with

import {ArticleCardComponent} from '@com-tuxin/cards/src/lib/article-card/article-card.component';

and that's it, problem is resolved.

and in my case in other libraries where I needed article-card component, I would just need to include @com-tuxin/cards/src/lib/article-card and I would get no circular dependencies.

hope this cleared things up.