missing

things/angular/src/app/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 { ToastComponent } from './toast/toast.component';
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+
+@NgModule({
+  declarations: [AppComponent, ToastComponent],
+  imports: [BrowserModule, AppRoutingModule, NgbModule],
+  providers: [],
+  bootstrap: [AppComponent],
+})
+export class AppModule {}

things/angular/src/app/toast.service.ts

@@ -4,6 +4,7 @@ export interface ToastInfo {
   id: number;
   header: string;
   body: string;
+  persist?: boolean;
   classname?: string;
 }