最近我一直在努力学习ngrx，我跟着一个指南。我所遵循的指南的代码与我的相同，但我得到了这个错误：

Type 'Observable<void>' is not assignable to type 'Observable<IComment[]>'.
  Type 'void' is not assignable to type 'IComment[]'.

字符串
我在commentComponent的构造函数中的isLoading$和comments$处都得到了错误：

import { Component, OnInit } from '@angular/core';
import { Store, select } from '@ngrx/store';
import { Observable } from 'rxjs';
import * as CommentActions from './store/comment.actions'
import { AppStateInterface } from 'src/app/types/appState.interface';
import { commentsSelector, isLoadingSelector } from './store/comment.selector';
import { IComment } from 'src/app/shared/interfaces/comment';

@Component({
  selector: 'app-comment',
  templateUrl: './comment.component.html',
  styleUrls: ['./comment.component.css'],
})
export class CommentComponent implements OnInit  {
  isLoading$: Observable<boolean>
  comments$: Observable<IComment[]>;

  constructor(private store: Store<AppStateInterface>) {
    this.isLoading$ = this.store.pipe(select(isLoadingSelector))
    this.comments$ = this.store.pipe(select(commentsSelector))
  }

  
  ngOnInit(): void {
    this.store.dispatch(CommentActions.getComments())
  }

}

型
我想我的问题在于选择器的某个地方，但我找不到它。

import { createSelector, select } from '@ngrx/store';
import { AppStateInterface } from 'src/app/types/appState.interface';

export const selectFeature = (state: AppStateInterface) => state.comments;

export const isLoadingSelector = createSelector(selectFeature, (state) => {
  state.isLoading;
});

export const commentsSelector = createSelector(selectFeature, (state) => {
  state.comments;
});

export const errorSelector = createSelector(selectFeature, (state) => {
  state.error;
});

型
由于它的代码太多，我将在这里粘贴仓库，所以任何人都可以检查出来。ngrx代码主要在./movies/comment/store文件夹中。https://github.com/kris34/Movies/tree/main/Client/movies-project/src/app/movie