You generate an effect by typing the following:

ng generate effect jedis

This will produce the files:

• jedis.effect.ts
• jedis.effect.spec.ts

The effects file looks like this:

import { Injectable } from '@angular/core';
import { Actions, Effect } from '@ngrx/effects';

@Injectable()
export class JedisEffects {
  constructor(private actions$: Actions) {}
}