Angular Custom Pipes and How it works https://embarkcode.com/angular-custom-pipes/

angular-custom-pipes-8.ts

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'myCustomPipe'
})
export class MyCustomPipe implements PipeTransform {
  transform(value: any, args?: any): any {
    return value;
  }
}