typescript 没有过载匹配此调用。重载 1 of 2,
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No overload matches this call. Overload 1 of 2,
提问by Jesus
I have store.jsfile
我有store.js文件
import { createStore, combineReducers } from "redux";
import reducerADD from "../reducer/reducerADD"
export const store = createStore(combineReducers({ reducerADD}));
When I change format in store.tsxI'm getting an Error:
当我更改格式时store.tsx出现错误：
No overload matches this call.
Overload 1 of 2, '(reducers: ReducersMapObject<{ reducerADD: { lastName: string; firstName: string; password: string; email: string; }[]; }, any>): Reducer<{ reducerADD: { lastName: string; firstName: string; password: string; email: string; }[]; }, AnyAction>', gave the following error.
Type '(state: never[] | undefined, action: action) => { lastName: string; firstName: string; password: string; email: string; }[]' is not assignable to type 'Reducer<{ lastName: string; firstName: string; password: string; email: string; }[], any>'.
Types of parameters 'state' and 'state' are incompatible.
Type '{ lastName: string; firstName: string; password: string; email: string; }[] | undefined' is not assignable to type 'never[] | undefined'.
Type '{ lastName: string; firstName: string; password: string; email: string; }[]' is not assignable to type 'never[]'.
Type '{ lastName: string; firstName: string; password: string; email: string; }' is not assignable to type 'never'.
Overload 2 of 2, '(reducers: ReducersMapObject<{ reducerADD: { lastName: string; firstName: string; password: string; email: string; }[]; }, AnyAction>): Reducer<{ reducerADD: { lastName: string; firstName: string; password: string; email: string; }[]; }, AnyAction>', gave the following error.
Type '(state: never[] | undefined, action: action) => { lastName: string; firstName: string; password: string; email: string; }[]' is not assignable to type 'Reducer<{ lastName: string; firstName: string; password: string; email: string; }[], AnyAction>'.
Types of parameters 'state' and 'state' are incompatible.
Type '{ lastName: string; firstName: string; password: string; email: string; }[] | undefined' is not assignable to type 'never[] | undefined'.
Type '{ lastName: string; firstName: string; password: string; email: string; }[]' is not assignable to type 'never[]'.
What is the reason for this?
这是什么原因？
采纳答案by Andy
The state needs to be abit more strongly typed. Its trying to cast your initial state from type anyto type never.
状态需要更强的类型。它试图将您的初始状态从 type 转换any为 type never。
When creating the default state for the data you should define an interface for your state, here's an example for a todo list array:
在为数据创建默认状态时，您应该为您的状态定义一个接口，以下是待办事项列表数组的示例：
interface IAppState {
toDoList: any[];
}
const initialState: IAppState = {
toDoList: []
};
export default function reducer(state = initialState, action) {}
