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How to import pipe to 2 modules(AppModule and ChildModule)?

By : JBegin
Date : October 18 2020, 06:10 AM
it helps some times I've got my main module - app.module.ts and it's child reports.module.ts. , You should have 3 modules, your pipe being in the third one.
code :
  declaration: [MomentPipe],
  exports: [MomentPipe],
export class PipesModule {}

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Angular 2 error when declaring custom pipe on AppModule

By : Jake V
Date : March 29 2020, 07:55 AM
this one helps. You're missing the @ before Pipe({ name: 'blankIf' }). Without it, it doesn't get treated like a decorator, and doesn't add the required pipe metadata to the class. So when you try to add the pipe to the declarations, it isn't recognized as a pipe, as it doesn't have the pipe metadata.

Error: Unexpected value 'SocialmediaFeedComponent' declared by the module 'AppModule'. Please add a @Pipe/@Directive/@Co

By : Rajendra Pal
Date : March 29 2020, 07:55 AM
Hope that helps As I can see you are missing @Component decorator above your class declaration. Try to add @Component keyword directly above your class.
Something like:
code :
  selector: 'app-socialmedia-feed',
  templateUrl: './socialmedia-feed.component.html',
  styleUrls: ['./socialmedia-feed.component.scss']
export class SocialmediaFeedComponent implements OnInit {

  constructor() {

  ngOnInit() {

      // ...

      // ...

Modules imported in AppModule aren't visible in different modules

By : user3246884
Date : March 29 2020, 07:55 AM
To fix this issue Umm... A common misconception in Angular is that importing a module in a parent module (i.e. in your example, AppModule) creates a hierarchy of modules. Hence, people assume AppModule's child modules (i.e. HomeModule) should also inherit parent module's imported modules.
However, that is not the case. Modules do not inherit access to modules declared in parent modules. Imagine a module as a box. A box will only contain whatever you put inside of it.
code :
       CommonModule, FormsModule, ReactiveFormsModule, MaterialModule, 
       //... {other modules that will be shared between modules} ...,
        CommonModule, FormsModule, ReactiveFormsModule, MaterialModule,
        //... {other modules that will be shared between modules} ...,

Unexpected pipe imported by the module 'AppModule'. Please add a @NgModule annotation

By : user3729820
Date : March 29 2020, 07:55 AM
To fix this issue Pipes should be added only in declarations, so just remove your pipe from imports.

Does import of unnecessary modules in AppModule slow down the Angular 2 app?

By : akram rabee
Date : March 29 2020, 07:55 AM
Hope this helps Yomateo is correct to say that tree shaking will take care of unused modules/module operators when build is performed.
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