پیاده سازی action و reducer در redux/toolkit

سلام استاد خسته نباشید. در پیاده سازی action و reducer برای user , course در پروژه تاپلرن اشکال دارم. ممکنه ببینید در کد زیر کجا اشکال هست؟ 

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

export const userSlice = createSlice({
    name: "user",
    initialState: {},
    reducers:{
        addUser: (state, action) => {
            state.user = action.payload
        },
        clearUse: (state) => {
            state.user = {}
        }
    },
});

export const { addUser, clearUser } = userSlice.actions
export default userSlice.reducer

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import {createAsyncThunk, createSlice} from '@reduxjs/toolkit';
import { getCourses } from "../services/courseService";

export const getAllCourses = createAsyncThunk("courses/getCourses", async () => {
    const { data } = await getCourses();
    return data.courses;
});



export const coursesSlice = createSlice({
    name: "courses",
    initialState: [],
    reducers:{},
    extraReducers: {
        [getAllCourses.pending.type]: (state) => {
          state = {
            status: "loading",
            data: [],
            error: {},
          };
        },
        [getAllCourses.fulfilled.type]: (state, action) => {
          state = {
            status: "done",
            data: action.payload,
            error: {},
          };
        },
        [getAllCourses.rejected.type]: (state, action) => {
          state = {
            status: "error",
            data: [],
            error: action.payload,
          };
        },
      },
});

export default coursesSlice.reducer