Typescript、ReduxJS 工具包 - createSlice 生成的 reducer 不可分配给类型 'Reducer<unknown, AnyAction>' 的参数

Question

我是 typescript 新手，在理解错误时遇到问题。我正在尝试使用 @reduxjs/toolkit 的 createSlice 生成的 reducer ，并将其输入具有以下定义的函数中:

// .d.ts file
export default function persistReducer<S, A extends Action = Action>(
  config: PersistConfig<S>,
  baseReducer: Reducer<S, A>
): Reducer<S & PersistPartial, A>;

// function definition
export default function persistReducer<State: Object, Action: Object>(
  config: PersistConfig,
  baseReducer: (State, Action) => State
): (State, Action) => State & PersistPartial { /* ... */

返回以下错误:

Argument of type 'Reducer<CoreState, AnyAction>' is not assignable to parameter of type 'Reducer<unknown, AnyAction>'.
  Types of parameters 'state' and 'state' are incompatible.
    Type 'unknown' is not assignable to type 'CoreState | undefined'.
      Type 'unknown' is not assignable to type 'CoreState'.ts(2345)

但是，当我将 reducer 转换为 redux/toolkit 提供的 Reducer 类型时，它会起作用。

// fails
persistReducer( persistConfig, coreReducer )

// succeeds
persistReducer( persistConfig, coreReducer as Reducer)

据我所知，reducer 已经具有该类型，并且我不确定为什么需要在发送该值之前对其进行转换。我缺少什么？任何帮助将不胜感激!

这是我的切片定义

import { createSlice, PayloadAction } from '@reduxjs/toolkit';

export type User = {
  id: string,
  name: string,
  avatar: string,
  token: string
}

export type CoreState {
  isSignedIn: boolean,
  user: User | null
};

const defaultCoreState : CoreState = {
  isSignedIn: false,
  user: null
};

export const slice = createSlice({
  name: 'core',
  initialState: defaultCoreState,
  reducers: {
    setUser: (state: CoreState, action: PayloadAction<User | null>) => {
      state.user = action.payload;
      state.isSignedIn = action.payload ? true : false;
    }
  }
});

export const { setUser } = slice.actions;
export default slice.reducer;

编辑:使用combineReducers创建的reducer会触发相同的错误，并通过相同的解决方法得到缓解。在我看来，persistReducer 函数在推断类型时遇到了困难，即使它从同一库导入了相同的Reducer 类型定义。给出了什么？

Answer 1

感谢 @phryneas 对 Reactiflux 不和谐的慷慨帮助，问题已经解决。

export default function persistReducer<S, A extends Action = Action>

应该变成:

export default function persistReducer<S, A extends AnyAction>

在调试这个过程时，我在梳理的所有定义中多次看到“Action”和“Any”一词，我错过了其中的区别。 AnyAction 是正确的类型。