Angular5+ Error: Unable to retrieve summary for RouterOutlet directive due to illegal state

When attempting to build my Angular App using ng build --prod --aot, I consistently encounter the following error:

ERROR in : Illegal state: Could not load the summary for directive RouterOutlet in C:/Path-To-Project/node_modules/@angular/Router/router.d.ts.

Compiling the project with "ng serve" does not result in any error messages. I have experimented with various lazy loading implementations, but each one triggers the same error. Despite rebuilding the app from scratch and adhering strictly to Angular specifications, I always circle back to encountering this error message.

Here is my package.json:

{
  "name": "Name",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --prod",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
''' etc... '''

My app.module.ts :

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
  /* etc... */
@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    CoreModule,
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }
''' More code snippets follow '''

If anyone has a solution to this issue, please share!

Answer №1

Encountered a similar issue while running ng test in my Angular 5 project that included tests written using Jasmine. The error message I received was Error: Uncaught (in promise): Error: Illegal state: Could not load the summary for directive RegisterComponent.. After some investigation, I realized that I had forgotten to include the declarations for my RegisterComponent within the

TestBed.configureTestingModule({})
block. Once I added it, the error disappeared. Below is the corrected code snippet:

beforeEach(fakeAsync(() => {
    TestBed.configureTestingModule({
     declarations: [
      RegisterComponent
     ],
     providers: [
      ApiService,
      AuthService,
      FormBuilder
     ]
    }).overrideComponent(RegisterComponent, {
     set: {
      providers: [{
       provide: ApiService,
       useClass: MockApiService
      }]
     }
    }).compileComponents().then(() => {
     componentFixture = TestBed.createComponent(RegisterComponent);
     component = componentFixture.componentInstance;
    });

Answer №2

The error has been resolved.

Regrettably, I am unable to provide a detailed description of the issue. My approach involved meticulously deconstructing an identical project and executing the command ng build --prod --aot multiple times. Subsequently, I systematically reconstructed components and modules within the fragmented project.

One of the key issues discovered was a misconfiguration in my app-routing.module file where incorrectly referenced the AppComponent:

{path: '', component: AppComponent, pathMatch: 'full'}
. This was rectified by updating the entry to:
{path: '', redirectTo: '', pathMatch: 'full'}
,

Additional errors were attributed to incorrect imports and exports across various modules, as well as improper implementation of router imports. It took me approximately 3 hours to identify and resolve these issues, so for those encountering similar problems, I recommend following a similar investigative process to pinpoint the root cause of the problem.

I trust that this post will be beneficial to others facing similar challenges.

Answer №3

To address the error

An unexpected error occurred: Unable to retrieve the summary for directive MyComponent

Here is the solution that worked for me:

declarations:[
      ...components....
      MyComponent  // <- including this SOLVED the PROBLEM
]

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