[Angular] TypeError: Cannot read property 'value' of undefined

Describe the bug When using a decorator to provide required modules to an angular component, storybook throws the error below:

TypeError: Cannot read property 'value' of undefined
    at extractNgModuleMetadata (VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:89276)
    at VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:89296
    at Array.some (<anonymous>)
    at getExistenceOfComponentInModules (VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:89295)
    at initModule (VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:89312)
    at push../node_modules/@storybook/angular/dist/client/preview/angular/helpers.js.exports.renderNgApp (VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:89346)
    at render (VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:89468)
    at renderMain (VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:91789)
    at StoryStore.renderUI (VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:91813)
    at StoryStore.emit (VM82 vendors~main.a7bca498af84c7b1b5b6.bundle.js:116462)

To Reproduce Steps to reproduce the behavior:

1. Create an Angular component
2. Create an Angular module which declares and exports the component and additionally imports other required modules from Angular
3. Create a story with a decorator to provide the module
4. Start storybook and select the story, error is shown on screen and in the console.

Expected behavior The component is shown as expected

Screenshots https://ibb.co/zmBBPgv

Code snippets

Module

@NgModule({
  declarations: [
    MapComponent
  ],
  imports: [
    CommonModule,
    NgxMapboxGLModule
  ],
  exports: [
    MapComponent,
    NgxMapboxGLModule
  ]
})
export class MapModule { }

Story

storiesOf('Map|Map', module)
  .addDecorator(
    moduleMetadata({
      imports: [
        MapModule,
      ]
    })
  )
  .add('Simple map without parameters', () => ({
    component: MapComponent
  }))

System:

• OS: Windows10
• Browser: chrome
• Framework: angular 7.2.0
• Version: 5.2.0-alpha.23

[ManuelRauber]

A current workaround for me seems to be to do:

storiesOf('core | core/MyComponent', module)
  .add('default', () => ({
    component: MyComponent,
    moduleMetadata: {
      declarations: [MyComponent], // Adding this brings it back to live
      imports: [
        TranslateModule.forRoot(),
      ],
    },
  }));

[pascaliske]

FYI: My PR (#7224) for this bug was recently merged into next! 🎉😄