mergeMap effects example

pokemon.effects.ts

 @Effect()
  loadAllBlogPosts$: Observable<any> = this.actions$.pipe(
    ofType(PokemonActions.loadPokemon),
    mergeMap(() =>
      this.postsService.getAll().pipe(
        map(posts => PokemonActions.loadPokemonSuccess({ posts })),
        catchError(message => of(PokemonActions.loadPostsFailed({ message })))
      )
    )
  );