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[英]Redux Thunk Typescript Error On mapDispatchToProps
[英]Error using createStore with typescript and thunk
我是打字稿的新手,我正在嘗試將反應應用程序轉換為使用打字稿。 當我在index.tsx文件中使用'redux'中的createStore函數時,我收到以下錯誤。
Type '{}' is missing the following properties from type '{ customersLoading: boolean; customersLoadError: boolean; customers: {}; editCustomerInProgress: boolean; editCustomerSuccess: boolean; editCustomerFail: boolean; addCustomerInProgress: boolean; ... 6 more ...; searchResults: {}; }': customersLoading, customersLoadError, customers, editCustomerInProgress, and 10 more. TS2345
似乎狀態被定義為{}的類型,但我已經為狀態對象定義了一個接口。
Index.js
import ReactDOM from 'react-dom';
import App from './App';
import {Provider} from 'react-redux';
import {createStore, applyMiddleware, compose} from 'redux';
import thunk from 'redux-thunk';
import reducer from './store/reducer';
import * as serviceWorker from './serviceWorker';
const composeEnhancers = compose;
const rootReducer = reducer;
const store = createStore(rootReducer, composeEnhancers(applyMiddleware(thunk)));
const app = (
<Provider store={store}>
<App />
</Provider>
);
ReactDOM.render(app, document.getElementById('root'));
// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
serviceWorker.unregister();
Reducer.tsx
import {stateShape, actionShape} from '../types/index';
const initialState = {
customersLoading: false,
customersLoadError: false,
customers: {},
editCustomerInProgress: false,
editCustomerSuccess: false,
editCustomerFail: false,
addCustomerInProgress: false,
addCustomerSuccess: false,
addCustomerFail: false,
deleteCustomerInProgress: false,
deleteCustomerSuccess: false,
deleteCustomerFail: false,
searchMode: false,
searchResults: {}
};
const updateObject = (oldObject: {}, updatedProperties: {}) => {
return {
...oldObject,
...updatedProperties
};
};
const editCustomer = (state: stateShape, action: actionShape) => {
let updatedState = {
editCustomerInProgress: false,
editCustomerFail: false,
editCustomerSuccess: true,
customers: {
...state.customers,
[action.payload.customerId]: action.payload.customerDetails
},
searchResults: {...state.searchResults}
};
if (state.searchMode){
updatedState = {
...updatedState,
searchResults: {
...state.searchResults,
[action.payload.customerId]: action.payload.customerDetails
}
}
};
return updateObject(state, updatedState);
};
const addCustomer = (state: stateShape, action: actionShape) => {
const updatedState = {
addCustomerInProgress: false,
addCustomerFail: false,
addCustomerSuccess: true,
customers: {
...state.customers,
[action.payload.customerId]: action.payload.customerData
}
};
return updateObject(state, updatedState);
};
const deleteCustomer = (state: stateShape, action: actionShape) => {
const updatedState = {
deleteCustomerInProgress: false,
deleteCustomerFail: false,
deleteCustomerSuccess: true,
customers: {
...state.customers,
[action.payload.customerId]: null
}
};
return updateObject(state, updatedState);
};
const searchCustomers = (state: stateShape, action: actionShape) => {
interface arrayInterface {
[key: number]: any
};
//filter matching customers from list of customers by search term
const matchingCustomers = Object.entries(state.customers).filter((current: arrayInterface) => {
let firstname = current[1].firstName.toLowerCase();
let lastname = current[1].lastName.toLowerCase();
let searchTerm = action.payload.searchTerm.toLowerCase();
return firstname === searchTerm || lastname === searchTerm;
});
let matchingCustomersObject;
matchingCustomers.forEach((current: arrayInterface) => {
matchingCustomersObject[current[0]] = current[1];
});
const updatedState = {
searchMode: true,
searchResults: matchingCustomersObject
};
return updateObject(state, updatedState);
};
let reducer = (state = initialState, action: actionShape) => {
switch (action.type){
case actionTypes.LOAD_CUSTOMERS_START:
return updateObject(state, {customersLoading: true});
case actionTypes.LOAD_CUSTOMERS_FAIL:
return updateObject(state, {customersLoading: false, customersLoadError: true});
case actionTypes.LOAD_CUSTOMERS_SUCCESS:
return updateObject(state, {customersLoading: false, customers: action.payload.customers});
case actionTypes.EDIT_CUSTOMER_START:
return updateObject(state, {editCustomerInProgress: true, editCustomerSuccess: false});
case actionTypes.EDIT_CUSTOMER_FAIL:
return updateObject(state, {editCustomerInProgress: false, editCustomerFail: true});
case actionTypes.EDIT_CUSTOMER_SUCCESS:
return editCustomer(state, action)
case actionTypes.ADD_CUSTOMER_START:
return updateObject(state, {addCustomerInProgress: true});
case actionTypes.ADD_CUSTOMER_FAIL:
return updateObject(state, {addCustomerInProgress: false, addCustomerFail: true});
case actionTypes.ADD_CUSTOMER_SUCCESS:
return addCustomer(state, action);
case actionTypes.DELETE_CUSTOMER_START:
return updateObject(state, {deleteCustomerInProgress: true});
case actionTypes.DELETE_CUSTOMER_FAIL:
return updateObject(state, {deleteCustomerInProgress: false, deleteCustomerFail: true});
case actionTypes.DELETE_CUSTOMER_SUCCESS:
return deleteCustomer(state, action);
case actionTypes.SEARCH_CUSTOMER_START:
return searchCustomers(state, action)
case actionTypes.SEARCH_CUSTOMER_END:
return updateObject(state, {searchMode: false, searchResults: []})
default:
return state;
}
};
export default reducer;
由reducer.tsx導入的動作和狀態形狀
customersLoading: boolean,
customersLoadError: boolean,
customers: {},
editCustomerInProgress: boolean,
editCustomerSuccess: boolean,
editCustomerFail: boolean,
addCustomerInProgress: boolean,
addCustomerSuccess: boolean,
addCustomerFail: boolean,
deleteCustomerInProgress: boolean,
deleteCustomerSuccess: boolean,
deleteCustomerFail: boolean,
searchMode: boolean,
searchResults: {}
};
export interface actionShape {
type: string,
payload: {
customerId: string,
customerData: Object,
customerDetails: Object,
customers: Object,
searchTerm: string
}
};
有人能夠指出我正確的方向來解決這個問題嗎?
問題源於reducer
簽名不兼容。 讓我們看看如何定義createStore
。
export interface StoreCreator {
<S, A extends Action, Ext, StateExt>(
reducer: Reducer<S, A>,
enhancer?: StoreEnhancer<Ext, StateExt>
): Store<S & StateExt, A> & Ext
<S, A extends Action, Ext, StateExt>(
reducer: Reducer<S, A>,
preloadedState?: DeepPartial<S>,
enhancer?: StoreEnhancer<Ext>
): Store<S & StateExt, A> & Ext
}
本質上它是重載函數,我們對第一個參數的類型感興趣, reducer
。
export type Reducer<S = any, A extends Action = AnyAction> = (
state: S | undefined,
action: A
) => S
Reducer
接受S
類型(用於state
)和類型A
(用於操作)的兩個參數,並返回類型S
值。
但您的reducer
定義如下
let reducer = (state = initialState, action: actionShape) => { /*...*/ }
對於所有操作,它返回updateObject(state, { /*...*/ })
,后者又定義為
const updateObject = (oldObject: {}, updatedProperties: {}) =>
{
return {
...oldObject,
...updatedProperties
}
}
因此,TS推斷返回類型的updateObject
為{}
並且它與在您的情況下為stateShape
S
stateShape
。
為解決此問題,我建議對updateObject
使用以下簽名
const updateObject = (oldObject: stateShape, updatedProperties: Partial<stateShape>): stateShape => {/*...*/}
所以它需要第一個參數類型為stateShape
,第二個參數為Partial<stateShape>
。 這允許您僅使用原始stateShape
某些屬性傳遞第二個參數,但禁止向狀態添加不存在的屬性。
更新reducer
函數的簽名以使其僅返回stateShape
也是個好主意
let reducer = (state = initialState, action: actionShape): stateShape
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