"In the combined declaration of 'DepartmentListComponent', all individual declarations must either be exported or kept local." - error message regarding routing components in TypeScript file

I followed a video tutorial to write this code, but it's not working as expected and is throwing some errors. Is it possible that the tutorial is outdated and using an older methodology? The code seems to be hard-coded without using any services.

Here is the code from app-routing.module.ts:

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { DepartmentListComponent } from './department-list/department-list.component';
import { EmployeeListComponent } from './employee-list/employee-list.component';


const routes: Routes = [
  { path: 'departments', component: DepartmentListComponent },
  { path: 'employees', component: EmployeeListComponent }

];

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

And here is the code from app.module.ts:

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

import { AppRoutingModule, routingComponents } from './app-routing.module';
import { AppComponent } from './app.component';


@NgModule({
  declarations: [
    AppComponent,
    routingComponents
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

In app.component.html:

<h1> Welcome to the Routing Example</h1>

<router-outlet></router-outlet>

I am a beginner and would appreciate any help in running the application with URLs changing to http://localhost:4200/employees and http://localhost:4200/departments. Thank you for your understanding.

Answer №1

In this particular file, the DepartmentListComponent is being exported and then imported locally within the same module.

Answer №2

Attempting to use the import and export statements for the same module within the same file will result in the following error.

Review all imports to confirm that they are not being exported from the same file.

Answer №3

Experiencing a similar issue here with a rather peculiar solution: Delete the export line (final line). Compile the code (without any errors) Re-insert the last line. Compile again... Problem solved. No need for explanations. I too am a beginner navigating through typescript and Angular :-)

Answer №4

When I encountered the issue with Webstorm, I found that a simple combination of restarting the program and clearing the cache resolved the problem instantly.

Answer №5

Encountering a similar issue, I recently faced an error with a freshly developed and exported interface. Resolving this hiccup was as simple as appending the 'Interface' suffix to the interface name.

From:

export interface Example {}

To:

export interface ExampleInterface {}

Answer №6

Encountered an error message due to mistakenly exporting duplicate interfaces from a single file.

Answer №7

It is not possible to re-export an import statement as a const. Therefore,

export const routingComponents  [DepartmentListComponent, EmployeeListComponent ]

should instead be written as

export const routingComponents = [DepartmentListComponent, EmployeeListComponent]

or

export { DepartmentListComponent, EmployeeListComponent }

Answer №8

After experimenting with intellij IDEs, I discovered that the solution to my issue was removing the export statement and then adding it back again (before the instance, not the class).

Initially, my code looked like this:

// x.ts
export class X {}
// y.ts
import {X} from "./x.ts"
export const instance = new X();  // I needed to remove this export statement in my case

Answer №9

An issue I encountered was trying to export a module with the same name as a constant variable.

Example:

export const ProductListComponent = [ProductListComponent]

Once I changed the name to something different, everything worked smoothly. I hope this tip proves helpful to others.

Answer №10

Encountered an error while trying to import an interface in a file that contained an exported React functional component with the same name.

import {Button} from "../../models";

export const Button: React.FC<Button> = () => {
  return (
    <>
      
    </>
  );
};

Resolved the issue by renaming the interface to ButtonConfig

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