Unable to add lazy loading in an Angular 5 + ASP.NET Core 2 app on production

Question

I followed this tutorial to add lazy loading to my app. Everything works fine on local server but when I publish my app I get error module cannot be found.I am using Angular Compiler Plugin.Here is my package.json "dependencies": { "@angular/animations": "^5.0.0", "@angular/cdk": "^5.0.0", "@angular/common": "^5.0.0", "@angular/compiler": "^5.0.0", "@angular/compiler-cli": "^5.0.0", "@angular/core": "^5.0.0", "@angular/forms": "^5.0.0", "@angular/http": "^5.0.0", "@angular/material": "^5.0.0", "@angular/material-moment-adapter": "^5.0.0", "@angular/platform-browser": "^5.0.0", "@angular/platform-browser-dynamic": "^5.0.0", "@angular/platform-server": "^5.0.0", "@angular/router": "^5.0.0", "@ngtools/webpack": "^1.9.0", "@types/webpack-env": "1.13.0", "angular-router-loader": "^0.8.0", "angular2-infinite-scroll": "^0.3.5", "angular2-template-loader": "0.6.2", "aspnet-prerendering": "^3.0.1", "aspnet-webpack": "^2.0.1", "awesome-typescript-loader": "3.2.1", "bootstrap": "^3.3.7", "bootstrap-select": "^1.12.4", "css": "2.2.1", "css-loader": "0.28.4", "es6-shim": "0.35.3", "event-source-polyfill": "0.0.9", "expose-loader": "0.7.3", "extract-text-webpack-plugin": "2.1.2", "file-loader": "0.11.2", "font-awesome": "^4.7.0", "hammerjs": "^2.0.8", "html-loader": "0.4.5", "isomorphic-fetch": "2.2.1", "jquery": "^3.2.1", "json-loader": "0.5.4", "moment": "^2.19.4", "ng2-auto-complete": "^0.12.0", "ngx-bootstrap": "^1.9.3", "preboot": "4.5.2", "raw-loader": "0.5.1", "reflect-metadata": "0.1.10", "rxjs": "^5.5.2", "select2": "^4.0.4", "style-loader": "0.18.2", "to-string-loader": "1.1.5", "typescript": "2.4.2", "url-loader": "0.5.9", "webpack": "2.5.1", "webpack-hot-middleware": "2.18.2", "webpack-merge": "4.1.0", "zone.js": "0.8.12" }

I also tried to load my components with a difrent approach like this:

path: 'hero', loadChildren: () => {
    return Promise.resolve(require('./components/hero/hero.module')['HeroModule']);
}

but then I get error Index signature of object type implicitly has an 'any' type.

Community · Accepted Answer · 2020-06-20 09:12:55Z

I have created 4 modules which all are lazy loaded in Angular

First thing you have to remove your module which you want to lazy load from app.module.ts file , here is the example and i am lazy loading HomePage module

app.module.ts

   import { NgModule} from '@angular/core';


//modules

   import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
   import { BrowserModule } from '@angular/platform-browser';



  //routing modules

    import { AppRoutingModule } from './app-routing.module';



   @NgModule({
     declarations: [ ],

     imports: [
     BrowserModule,
     BrowserAnimationsModule,
     AppRoutingModule, ],

      bootstrap: [AppComponent] 
      })
     export class AppModule {}

The module which you want to lazy load will come in app-routing-module

app-routing-module.ts

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



 const routes: Routes = [
 { path: "", component: LandingComponent },

 {
  path: "homepage",
  loadChildren: "./homepage/homepage.module#HomePageModule"
 },

 ];

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

load children is property we use when we want to lazy load any module in our app and #HomePageModule is the name of the module which i want to lazy load

To check that module has been lazy loaded , when you build your angular app it will give you chunk like this

chunk {homepage.module} homepage.module.chunk.js, 
homepage.module.chunk.js.map () 6.41 kB  [rendered]
chunk {inline} inline.bundle.js, inline.bundle.js.map (inline) 5.83 kB 
[entry] [rendered]
chunk {polyfills} polyfills.bundle.js, polyfills.bundle.js.map 
(polyfills) 215 kB [initial] [rendered]
chunk {styles} styles.bundle.js, styles.bundle.js.map (styles) 177 kB 
[initial] [rendered]
chunk {vendor} vendor.bundle.js, vendor.bundle.js.map (vendor) 5.31 MB 
[initial] [rendered]

It shows your module has been lazy loaded successfully

I hope this will help you

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