chore(internal API): introduce an internal API for ngtools. (#13415)

modules/@angular/compiler-cli/integrationtest/ngtools_src/feature/lazy-feature.module.ts

@@ -0,0 +1,20 @@
+import {NgModule, Component} from '@angular/core';
+import {RouterModule} from '@angular/router';
+
+@Component({
+  selector: 'lazy-feature-comp',
+  template: 'lazy feature!'
+})
+export class LazyFeatureComponent {}
+
+@NgModule({
+  imports: [
+    RouterModule.forChild([
+      {path: '', component: LazyFeatureComponent, pathMatch: 'full'},
+      {path: 'feature', loadChildren: './feature.module#FeatureModule'}
+    ])
+  ],
+  declarations: [LazyFeatureComponent]
+})
+export class LazyFeatureModule {
+}