Type error when saving FormData when using Redux toolkit

I've tried to save FormData(Javascript's standard API) using redux toolkit.

const initialState{
 myFile: FormData | null
}


const controllerSlice = createSlice({
  name: 'controller',
  initialState,
  reducers: {
    test: (state, action) => ({
      ...state,
    }),
//...

It complains

Types of property 'myFile' are incompatible. Type 'WritableDraft<FormData> | null' is not assignable to type 'FormData | null'

I don't know why it complains exactly, but redux toolkit uses immerjs inside of it so seems it wraps FormData with WritableDraft.

The only solution what I've found is changing FormData | null to any

const initialState{
 myFile: any
}

But I want to use FormData | null as a type of myFile. Any ideas?