ts1206 decorators are not valid here, Angular 2

The Decorators must come directly before an exported class for example:

@Component({
    ...
})
export class someComponent{}

this goes the same for @Pipe @Directive @Injectable and @NgModule

This error came to me when I used angular routing and defined routes after @NgModule decorator.

We need to define routes or any other decorater before the @NgModule decorator.

const appRoutes: Routes = [    // define this before @NgModule 
 { path: '',
   redirectTo: '/home',
   pathMatch: 'full'
 },
 { path: 'home', component: HomeComponent },
];


@NgModule({            // This Decorator should be just before an exported class 
declarations: [
 AppComponent,
 HeaderComponent,
 HomeComponent
],
imports: [
 BrowserModule,
 RouterModule.forRoot(
   appRoutes,
   { enableTracing: true } // <-- debugging purposes only
 )
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }