Angular 7 - ALERT: Circular dependency identified:

Question

Angular 7 - ALERT: Circular dependency identified:

Suddenly, a lightbulb went off in my head. I encountered two warnings while running ng serve:

WARNING in Circular dependency detected:
src\app\_services\ignore-interceptor.service.ts -> 
src\app\_services\index.ts -> src\app\_services\ignore- 
interceptor.service.ts

WARNING in Circular dependency detected:
src\app\_services\index.ts -> src\app\_services\ignore- 
interceptor.service.ts -> src\app\_services\index.ts
i ｢wdm｣: Compiled with warnings.

The code snippets involved are:

ignore-interceptor.service.ts

import { UserService } from '../_services';
...
...

index.ts:

export * from './alert.service';
export * from './authentication.service';
export * from './user.service';
export * from './ignore-interceptor.service'

Upon removing import { UserService } from '../_services'; from ignore-interceptor.service.ts, the warnings disappear.

Any suggestions?

Thank you

angular typescript

Answer 1

Answer №1

To prevent a circular dependency warning when importing services from other services that are exported by the same index.ts file, it is important to explicitly import the specific dependency by name.

For example:

import { UserService } from '../_services/user.service';

Instead of:

import { UserService } from '../_services';

Regards

Answer 2

To prevent a circular dependency warning when importing services from other services that are exported by the same index.ts file, it is important to explicitly import the specific dependency by name.

For example:

import { UserService } from '../_services/user.service';

Instead of:

import { UserService } from '../_services';

Regards

Answer 3

Answer №2

One common issue that can arise is circular dependency when exporting services using an index.ts file and then importing those services in another service also exported in the same index.ts file.

For example, if you are importing UserService from the index.ts file (where it is exported from the user-service file) into the ignore-interceptor.service, while also exporting both the 'user-service' and ignore-interceptor.service in the index.ts file, a circular dependency is formed.

This results in the following circular dependency:

ignore-interceptor.service → index.ts → ignore-interceptor.service

In such cases, it is recommended to import services using absolute paths instead of through the index.ts file. For instance:

import { UserService } from '../_services/user.service';

It is advisable to avoid using index.ts for exporting and importing services. This best practice also applies to components, models, or any other classes.

Answer 4

One common issue that can arise is circular dependency when exporting services using an index.ts file and then importing those services in another service also exported in the same index.ts file.

For example, if you are importing UserService from the index.ts file (where it is exported from the user-service file) into the ignore-interceptor.service, while also exporting both the 'user-service' and ignore-interceptor.service in the index.ts file, a circular dependency is formed.

This results in the following circular dependency:

ignore-interceptor.service → index.ts → ignore-interceptor.service

In such cases, it is recommended to import services using absolute paths instead of through the index.ts file. For instance:

import { UserService } from '../_services/user.service';

It is advisable to avoid using index.ts for exporting and importing services. This best practice also applies to components, models, or any other classes.

Angular 7 - ALERT: Circular dependency identified:

Answer №1

Answer №2

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