Angular LazyLoad with callback Function fails to c

问题:

I'm try to compile a test SPA with ng build --prod --build-optimizer

I'm experiencing this error:

expressions are not supported in decorators in 'ɵ0' angular loadchild

I found this https://github.com/angular/angular/issues/10789

where is suggested to change form this:

import {MainModule} from './../../main/main.module';

const sidenavRoutes: Routes = [

  {
    path: '',
    component: SidenavComponent,
   canActivateChild: [AuthGuard],
    children: [
      { path: '', loadChildren: () =>MainModule}
    ]

  },

];

to

import {MainModule} from './../../main/main.module';

export function loadMainModule() {
  return require('es6-promise!./../../main/main.module')('MainModule');
}

const sidenavRoutes: Routes = [

  {
    path: '',
    component: SidenavComponent,
   canActivateChild: [AuthGuard],
    children: [
      { path: '', loadChildren: loadMainModule}
    ]

  },

];

but I get this error:

MyPATH\node_modules\loader-runner\lib\loadLoader.js:35 throw new Error("Module '" + loader.path + "' is not a loader (must have normal or pitch function)"); ^

Error: Module 'MyPATH\node_modules\es6-promise\dist\es6-promise.js' is not a loader (must have normal or pitch function)

do you have any suggestions?