import { of } from 'rxjs'
import { concatMap } from 'rxjs/operators'

interface Product {
  title: string
}

class MyProductService {
  getProduct<T> () {
    return of(null)
  }

  withGeneric_notOk () {
    return of(null).pipe(
      concatMap(() => this.getProduct<Product>())
    )
  }

  noGeneric_ok () {
    return of(null).pipe(
      concatMap(() => this.getProduct())
    )
  }
}