use Payload Creator

cartSlice.js

const todosSlice = createSlice({
  name: 'cart',
  initialState: [],
  reducers: {
    addItem: {
      reducer: (state, action) => {
        state.push(action.payload)
      },
      prepare: item => {
        const id = nanoid()
        return { payload: { id, ...item } }
      }
    }
  }
})