angular-cn/packages/core/schematics/migrations/injectable-pipe/README.md

Injectable annotation on pipes

In ViewEngine it was possible to inject a class that was annotated as a Pipe, however this no longer works in Ivy if the class also doesn't have the Injectable decorator. This migration adds Injectable automatically to all Pipe classes.

Before

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

@Pipe({ name: 'myPipe' })
class MyPipe {}

After

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

@Injectable()
@Pipe({ name: 'myPipe' })
class MyPipe {}