No pipe named '' was discovered

I have created a custom pipe in Angular, but when I try to use it, I keep receiving the error message: "No pipe found with name 'RefPipe'". I have searched for solutions online and they all suggest importing the pipe. However, I have tried importing it in different folders without success. Initially, I imported the pipe in app.module.ts so that it could be accessed globally, but that didn't work either. Then, I attempted to import it directly into the ts file of the component where I am trying to use the pipe, but I still encounter errors. Any assistance on this matter would be greatly appreciated.

<p>Book ID: {{bookParent.id_book | RefPipe}}</p>
import { CommonModule } from '@angular/common';
import { Component, Input, Output, EventEmitter } from '@angular/core';
import { Book } from '../module/book';
import { NgClass, UpperCasePipe } from '@angular/common';

@Component({
  selector: 'app-card',
  standalone: true,
  imports: [
    NgClass,
    UpperCasePipe,
    CommonModule

  ],
  templateUrl: './card.component.html',
  styleUrl: './card.component.css'
})
import { RefPipe } from './pipes/ref.pipe';

@NgModule({
  declarations: [
    AppComponent,
    HeaderComponent,
    FooterComponent,
    HomeComponent,
    FormRegisterComponent,
    ProfileComponent,
    RefPipe,
    CommonModule
    
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    FormsModule,
    AddBookComponent,
    UpdateBookComponent,
  ],
  providers: [
    provideClientHydration(),
    BooksService,
    RefPipe 
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

The code for the pipe is as follows:

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
   name: 'ref',
   standalone: true
})
export class RefPipe implements PipeTransform {
   transform(value: string, count:number):string {
     let result = "";
     
     for(let i = 0; i<count;i++){
         result += "-ref" +  value
     }
 
     return result;                          
   }
}

Answer №1

Based on the code in your pipe, it appears that you should utilize ref within the template (i.e. the pipe's name) rather than the class name RefPipe.

Additionally, since you are using standalone components and pipes, there is no need for any modules; simply add your RefPipe to the imports array of your module.

So your setup would look like this:
ts

@Component({
  imports: [
    ... your imports,
    RefPipe
  ],
  standalone: true,
  ...
})

template

<p>Book ID: {{bookParent.id_book | ref}}</p>

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