feature module lazy loading not working

[av3ng3r]

Versions

Angular CLI: 6.0.0
Node: 8.11.1
OS: win32 x64
Angular: 6.0.0
... animations, cli, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.6.0
@angular-devkit/build-angular     0.6.0
@angular-devkit/build-optimizer   0.6.0
@angular-devkit/core              0.6.0
@angular-devkit/schematics        0.6.0
@angular/cdk                      6.0.1
@angular/material                 6.0.1
@ngtools/webpack                  6.0.0
@schematics/angular               0.6.0
@schematics/update                0.6.0
rxjs                              6.1.0
typescript                        2.7.2
webpack                           4.6.0

My code base

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule, Routes } from "@angular/router";
import { HomeComponent } from "./home/home.component";
import { AdminModule } from "./admin/admin.module";

const routes: Routes = [
{
path: 'admin',
loadChildren: './admin/admin.module#AdminModule'
},
{ path: '', redirectTo: '/home', pathMatch: 'full' },
{ path: 'home', component: HomeComponent },
];

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

###Error thrown

ERROR Error: Uncaught (in promise): TypeError: undefined is not a function
TypeError: undefined is not a function
    at Array.map (<anonymous>)
    at webpackAsyncContext ($_lazy_route_resource lazy namespace object:18)
    at SystemJsNgModuleLoader.push../node_modules/@angular/core/fesm5/core.js.SystemJsNgModuleLoader.loadAndCompile (core.js:5569)
    at SystemJsNgModuleLoader.push../node_modules/@angular/core/fesm5/core.js.SystemJsNgModuleLoader.load (core.js:5561)
    at RouterConfigLoader.push../node_modules/@angular/router/fesm5/router.js.RouterConfigLoader.loadModuleFactory (router.js:3294)
    at RouterConfigLoader.push../node_modules/@angular/router/fesm5/router.js.RouterConfigLoader.load (router.js:3282)
    at MergeMapSubscriber.project (router.js:1479)
    at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._tryNext (mergeMap.js:117)
    at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._next (mergeMap.js:107)
    at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next (Subscriber.js:93)
    at Array.map (<anonymous>)
    at webpackAsyncContext ($_lazy_route_resource lazy namespace object:18)
    at SystemJsNgModuleLoader.push../node_modules/@angular/core/fesm5/core.js.SystemJsNgModuleLoader.loadAndCompile (core.js:5569)
    at SystemJsNgModuleLoader.push../node_modules/@angular/core/fesm5/core.js.SystemJsNgModuleLoader.load (core.js:5561)
    at RouterConfigLoader.push../node_modules/@angular/router/fesm5/router.js.RouterConfigLoader.loadModuleFactory (router.js:3294)
    at RouterConfigLoader.push../node_modules/@angular/router/fesm5/router.js.RouterConfigLoader.load (router.js:3282)
    at MergeMapSubscriber.project (router.js:1479)
    at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._tryNext (mergeMap.js:117)
    at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._next (mergeMap.js:107)
    at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next (Subscriber.js:93)
    at resolvePromise (zone.js:814)
    at resolvePromise (zone.js:771)
    at zone.js:873
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:421)
    at Object.onInvokeTask (core.js:4062)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:420)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:188)
    at drainMicroTaskQueue (zone.js:595)
    at ZoneTask.push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (zone.js:500)
    at invokeTask (zone.js:1540)


````

[gaelmigliorini]

Same here.
This was working well on Angular 5, and after I've done the migration from 5 to 6 (as well as CLI from 1.6.3 to 6.0.0) the lazy loading is down.
*** Here *** is the line where the error occurs :

var map = {
  "./XXX/XXX.module": [
    "./src/app/components/XXX.module.ts"
  ],
};

function webpackAsyncContext(req) {
  var ids = map[req];
  if(!ids) {
    return Promise.resolve().then(function() {
      var e = new Error('Cannot find module "' + req + '".');
      e.code = 'MODULE_NOT_FOUND';
      throw e;
  });
}
	
return Promise.all(ids.slice(1).map(__webpack_require__.e)).then(function() {  ******* <-- HERE *******
  var module = __webpack_require__(ids[0]);
  return module;
  });
}
webpackAsyncContext.keys = function webpackAsyncContextKeys() {
  return Object.keys(map);
};
webpackAsyncContext.id = "./src/$$_lazy_route_resource lazy recursive";
module.exports = webpackAsyncContext;

[clydin]

This appears to be a bug but we will need to look at a reproduction to find and fix the problem. Can you setup a minimal reproduction please?

You can read here why this is needed. A good way to make a minimal reproduction is to create a new app via ng new repro-app and adding the minimum possible code to show the problem. Then you can push this repository to github and link it here.

[martin-g]

Duplicate of #9651

[martin-g]

Duplicate of #9488

[martin-g]

Duplicate of #9775

[alan-agius4]

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