NG6002 error: This error is showing up in the imports of AppModule, even though it has its own set of issues

Running Angular 12 locally is smooth with no errors in the project build.

Local Configuration:

Angular CLI: 12.0.5  
Node: 12.16.3  
Package Manager: npm 6.14.4  
OS: win32 x64  
Angular: 12.0.5

However, when attempting to build the project on a Linux server, an error occurs with limited information for troubleshooting.

Server Configuration:

Angular CLI: 12.0.5  
Node: 14.18.1  
Package Manager: npm 6.14.15  
OS: linux x64  
Angular: 12.0.5
Error: src/app/app-routing.module.ts:34:14 - error NG6002: Appears in the NgModule.imports of AppModule, but itself has errors  
34 export class AppRoutingModule { }

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { HomeComponent } from './home/home.component';
import { HeaderComponent } from './header/header.component';
import { FooterComponent } from './footer/footer.component';
import { NotifyFormComponent } from './notify-form/notify-form.component';
import { LoginComponent } from './login/login.component';

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent,
    HeaderComponent,
    FooterComponent,
    NotifyFormComponent,
    LoginComponent
  ],
  imports: [
    AppRoutingModule,
    BrowserModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

app-routing.module.ts

import { LoginComponent } from './login/login.component';
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { NotifyFormComponent } from './notify-form/notify-form.component';
import { HomeComponent } from './home/home.component';

const routes: Routes = [
  {path:'',redirectTo:'/',pathMatch: 'full'},
  {
    path:'', 
    component: HomeComponent,
    children:[
      
    ]
  },
  {
    path:'notify', 
    component: NotifyFormComponent
  },
  {
    path:'login', 
    component: LoginComponent
  }

];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2017",
    "module": "es2020",
    "lib": [
      "es2018",
      "dom"
    ]
  }, 
  "angularCompilerOptions": {
    "enableI18nLegacyMessageIdFormat": false,
    "strictInjectionParameters": true,
    "strictInputAccessModifiers": true,
    "strictTemplates": true
  }
}

If there are any glaring issues I'm missing, please offer your assistance as this is just a basic test project. Thank you in advance.

Answer №1

After extensive research, I came across an official issue related to this topic on GitHub. Additionally, here is another question discussing the issue on StackOverflow. Despite these resources, I will provide a summary of the findings.

  • Some users have reported success by simply restarting and rebuilding the project or performing a full npm cache clear with reinstallation of node_modules.

  • Others have recommended disabling "ivy" in the tsconfig file as a workaround, although it may not be the recommended solution.

  • This issue can also arise if components are added to imports instead of declarations.

  • Sometimes, the error occurs when packages are installed as root or if incorrect permissions are set on the packages directory. This was resolved by adjusting ownership permissions, but the ideal solution is to install packages properly and configure npm to avoid installing with root permissions.

  • The error has been linked to mistakenly adding a service to imports instead of providers.

  • Misnaming packages, such as using "SomeComponent" instead of "SomeComponentModule," can trigger this error.

  • In certain cases, importing the app router before the browser module may lead to issues. It is advisable to swap their order if nothing else resolves the problem.

This summarizes the key information gathered.

Answer №2

Make sure to verify that the paths specified in 'templateUrl' and 'styleUrls' are accurate for the components associated with this module experiencing issues,

@Component({
    selector: 'app-navigation-menu-item',
    templateUrl: './yyy.component.html',
    styleUrls: ['./yyy.component.scss']
})

In my situation, this turned out to be the root cause of the bug.

Answer №3

The issue was resolved by running the ng serve command. This problem occurs when making changes to the configurations in the angular.json file.

Answer №4

Recently transitioned from Angular 11 to version 15 and encountered frequent "error NG6002: This import contains errors, which may affect components" messages in a functioning project

The solution that worked for me was updating the angular.json file:

.... "aot": false, "buildOptimizer": false, ...

Answer №5

If you're facing a similar situation, make sure to adjust the AOT configuration in your angular.json file for your specific environment:

"projects": {
  "YOUR_PROJECT_NAME": {
    "architect": {
      "build": {
        "configurations": {
          "production": {
            // include production settings here
          },
          "development": {
            // include development settings here
            "aot": false
          }
        }
      }
    }
  }
}

Hopefully this solution works for you.

Answer №6

Make sure to confirm all necessary imports are included in the app.module.ts file and review the Linux system for any additional components that may need to be added. Following these steps should ensure smooth functionality.

Answer №7

To ensure compatibility, aim for npm version higher than 8.1.0 and node version greater than v16.13.0

Answer №8

Encountered this issue during the transition of a project from Windows to Linux.
The problem lay in the capital letters used in the paths of my module imports, causing failures in Linux but functioning correctly in Windows.
For instance, on Windows both versions below would function:

import { switchMap, tap } from 'rxjs/operators';
import { switchMap, tap } from 'rxjs/Operators';

However, only the lowercase version is operational in Linux:

import { switchMap, tap } from 'rxjs/operators';

Answer №9

The issue that I encountered was due to an incompatible version of Nodejs. To check if the installed node version is compatible with angular version, you can run ng version. If the node version is not supported, the output will look like Node: 16.x.x (Not Supported)

Solving the problem involved uninstalling the unsupported node version and installing a compatible one.

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