my reducers is not a function

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Summary

my Error is TypeError: middleware is not a function
9 | function initStore(initialState) {
10 | return createStore(

11 | reducers,
| ^
12 | initialState,
13 | composeWithDevTools(applyMiddleware(thunkMiddleware))
14 | )

Sorry for my bad English

Additional information

reducers|-auth.js
               -index.js
auth.js code is
const initialState = {
    user : null,
    isAuthenticated : null,
    loading : false
}

const authReducer = (state = initialState, action) => {
    const { type, payload } = action

    switch (type) {
        default:
            return state
    }
}
export default authReducer

index.js code is
import { combineReducers } from "redux"
import authReducer from './auth'

export default combineReducers({
    auth: authReducer
})

Example

No response