使用 Typescript 的 CombineReducers 返回错误“类型参数不能分配给类型为“ReducersMapObject”的参数”

Question

我正在尝试使用 react + redux + typescript 设置前端环境，但我正在努力使其与 combineReducers 一起工作。我收到一个错误：类型参数不能分配给“ReducersMapObject”类型的参数。请参阅代码下方的完整错误消息。

状态：（类型/index.tsx）

export namespace StoreState {

  export type Enthusiasm = {
    languageName: string;
    enthusiasmLevel: number;
  }

  export type All = {
    enthusiasm: Enthusiasm
  }
}

商店：（商店.tsx）

import { createStore } from 'redux';
import reducers from './reducers/index';
import { StoreState } from './types/index';

let devtools: any = window['devToolsExtension'] ? window['devToolsExtension']() : (f:any)=>f;

const Store = createStore<StoreState.All>(reducers, devtools);
export default Store;

减速器：（/减速器/HelloReducer.tsx）

    import { EnthusiasmAction } from '../actions';
    import { StoreState } from '../types/index';
    import { INCREMENT_ENTHUSIASM, DECREMENT_ENTHUSIASM } from '../constants/index';

    export const enthusiasm = (state: StoreState.Enthusiasm, 
action: EnthusiasmAction): StoreState.Enthusiasm => {
      switch (action.type) {
        case INCREMENT_ENTHUSIASM:
            return { ...state, enthusiasmLevel: state.enthusiasmLevel + 1 };
        case DECREMENT_ENTHUSIASM:
            return { ...state, enthusiasmLevel: Math.max(1, state.enthusiasmLevel - 1) };
        default:
            return state;
     }
   }

组合减速器 (/reducers/index.tsx)

import { StoreState } from '../types/index';
import * as enthusiasmReducer from './HelloReducer';

import { combineReducers } from 'redux';

const reducer = combineReducers<StoreState.All>({
    enthusiasm: enthusiasmReducer
});

export default reducer;

Answer 1

您正在传递带有所有导出的对象，HelloReducer而不仅仅是减速器。有几种方法可以修复它。您可以选择减速机：

const reducer = combineReducers<StoreState.All>({
    enthusiasm: enthusiasmReducer.enthusiasm
});

或仅导入减速器：

import {enthusiasm} from './HelloReducer';
..
const reducer = combineReducers({enthusiasm});

或添加export default enthusiasm;并将HelloReducer.tsx导入更改为

import enthusiasmReducer from './HelloReducer';