bug: Ionic 4 lazy loaded route - module not found

[ionitron-bot]

Original issue by @rizzla22 on 2019-04-28T16:31:44Z

Im having a lot of issues with Ionic 4 and lazy loaded modules, for some reason it keeps reporting that the below login module cannot be found, if I edit the app-routing.module.ts file and save sometimes it finds it. anyone come across this issue yet and know how to fix ?

error in app.module.ts Error: Uncaught (in promise): Error: Cannot find module './pages/auth/login/login.module'
Error: Cannot find module './pages/auth/login/login.module'

// main app module

        import { ErrorHandler, NgModule } from '@angular/core';
        import { BrowserModule } from '@angular/platform-browser';
        import { RouteReuseStrategy } from '@angular/router';

        import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
        // AoT requires an exported function for factories
        export function HttpLoaderFactory(http: HttpClient) {
            return new TranslateHttpLoader(http, 'assets/i18n/')
        }



        class MyErrorHandler implements ErrorHandler {
        handleError(error) {
            console.log("error in app.module.ts", error);
        }
        }


        @NgModule({
        declarations: [AppComponent],
        entryComponents: [],
        imports: [ 
            BrowserModule,
            IonicModule.forRoot(),
            AppRoutingModule,
            HttpClientModule,
            TranslateModule.forRoot({
                loader: {
                    provide: TranslateLoader,
                    useFactory: HttpLoaderFactory,
                    deps: [HttpClient]
                }
            }),
            AngularFireModule.initializeApp({
            }),
            AngularFireDatabaseModule,
            // Put your custom imports below this line to make merges in Git easier   
            FormsModule,
            ReactiveFormsModule,
            ],   
        providers: [
                {provide: ErrorHandler, useClass: MyErrorHandler}, // had to add a custom error handler class here as IonicErrorHandler deprecated - 
                { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
        ],
        bootstrap: [AppComponent]
        })
        export class AppModule {}

// main Routes file lazy loading the login page that cant be found

        import { NgModule } from '@angular/core';
        import { PreloadAllModules, RouterModule, Routes } from '@angular/router';

        const routes: Routes = [
        { path: '', redirectTo: 'home', pathMatch: 'full' },
        { path: 'login', loadChildren: './pages/auth/login/login.module#LoginPageModule' },
        { path: 'home', loadChildren: './pages/home/home.module#HomePageModule' },
        ];

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

// login lazyloaded module that cant be found

        import { NgModule } from '@angular/core';
        import { CommonModule } from '@angular/common';
        import { FormsModule, ReactiveFormsModule } from '@angular/forms';
        import { Routes, RouterModule } from '@angular/router';
        import { TranslateModule} from "@ngx-translate/core"
        import { IonicModule } from '@ionic/angular';

        import { LoginPage } from './login.page';

        const routes: Routes = [
        {
            path: '',
            component: LoginPage
        }
        ];

        @NgModule({
        imports: [
            CommonModule,
            FormsModule,
            IonicModule,
            ReactiveFormsModule,    
            TranslateModule,
            RouterModule.forChild(routes)
        ],
        declarations: [LoginPage]
        })
        export class LoginPageModule {}