我知道Redux Toolkit中的Immer库会把所有可变代码转换成createSlice（）中的不变代码，但是我还是想写不变的reducer。这个代码是不变的吗？如果不是，如何修正它？Redux Toolkit中的不变性是什么？如何实现？

import { createSlice, PayloadAction } from '@reduxjs/toolkit'
import { Tab } from '../../logic/types'
import { TabsState, updateTabPayload } from '../types'

const initialState: TabsState = {
  tabs: []
}

export const tabsSlice = createSlice({
  name: 'tabs',
  initialState,
  reducers: {
    loadTabs: (state, tabs: PayloadAction<Tab[]>) => {
      state.tabs = [...state.tabs, ...tabs.payload]
    },
    createTab: (state, tab: PayloadAction<Tab>) => {
      state.tabs = [...state.tabs, tab.payload]
    },
    updateTab: (state, data: PayloadAction<updateTabPayload>) => {
      const index = state.tabs.findIndex((tab) => tab.id === data.payload.id)
      state.tabs[index] = { ...state.tabs[index], ...data.payload.update }
    },
    deleteTab: (state, id: PayloadAction<number>) => {
      state.tabs = state.tabs.filter((tab) => tab.id !== id.payload)
    }
  }
})

export const { loadTabs, createTab, updateTab, deleteTab } = tabsSlice.actions

export default tabsSlice.reducer

我试着去寻找这方面的信息，但还是没有找到。