您可以使用extraReducer来实现这一点。
你可以传递任意的有效载荷（比如{"a": 2, "b": "bar"}）给创建的动作。使用createAction，你可以拥有不“属于”特定切片的动作，请参见：https://redux-toolkit.js.org/api/createAction，并在两个分片中实现extraReducer，这些分片仅使用其有效负载部分。

根据定义，Reducer只能访问他们拥有的状态部分。用户减速器，立柱：postsReducer}，则usersReducer根本无法访问posts状态切片。How can I access state of another slice in redux with redux-toolkit?。
因此，您必须分派两个切片的两个动作，每个单独的减速器将单独更新其状态。

正如Dermeck建议的那样，您确实可以将extraReducers * 与 * typesafety一起使用。
一个最小的例子是：

import {combineReducers, configureStore, createAction, createSlice, PayloadAction} from "@reduxjs/toolkit";

export const replaceWith = createAction<RootState>('REPLACE_WITH');

const initialState: { a: number } = {
  a: 0
}

export const aSlice = createSlice({
  name: 'a-slice',
  initialState,
  reducers: {
    reduce(state, action: PayloadAction<number>) {
      return {a: action.payload}
    }
  },
  extraReducers: (builder) => {
    builder.addCase(replaceWith, (_, action) => {
      return {
        ...action.payload.aReducer,
      };
    });
  },
});

export const bSlice = createSlice({
  name: 'b-slice',
  initialState: {},
  reducers: {/* TODO */},
  extraReducers: (builder) => {/* TODO */},
});

const rootReducer = combineReducers({
  aReducer: aSlice.reducer,
  bReducer: bSlice.reducer
});

const store = configureStore({
  reducer: rootReducer,
});

export type RootState = ReturnType<typeof rootReducer>;

最后，在React组件中，您可以执行以下操作：

const dispatch = useDispatch();
dispatch(replaceWith(newState));