type FormState = {
    option1: number,
    option2: number,
    option3: number,
    option4: number,
    option5: number,
}

type ReduxState = {
    option1: [number, string, string], // mozesz miec tablice typowana na dokladnie 3 elementy
    option2: number,
    option3: number,
    option4: number,
    option5: number,
    // option6
}

const func = (state: ReduxState, form: FormState) =>  {
    const {option1, option2, option3, ...formRest} = form;

    return {
        option1: [option1, option2, option3],
        ...formRest
    }
}