angular-docs-cn/public/docs/_examples/testing/ts/app/my-uppercase.pipe.ts

// #docregion
// #docregion depends-on-angular
import {Pipe, PipeTransform} from '@angular/core';
// #enddocregion depends-on-angular

@Pipe({ name: 'my-uppercase' })
export class MyUppercasePipe implements PipeTransform {
  // #docregion uppercase
  transform(value: string) {
    return value.toUpperCase();
  }
  // #enddocregion uppercase
}