export function setupImages<R extends ImageHolder<K>, K extends string>(item: R, keys: K[]): SetupImages<K> {
    return <any>undefined
}

const test: TestInterface = <any>undefined

const two_steps = setupImages(test, ['image'])
const {prepare: prepare_two_steps, ...two_steps_rest} = two_steps

const {prepare: prepare_one_step, ...one_step_rest} = setupImages(test, ['image']) // Error on `test`

export function setupImages<R extends ImageHolder<K>, K extends string>(item: R, keys: K[]): SetupImages<K> {
    return <any>undefined
}

const test: TestInterface = <any>undefined

const two_steps = setupImages(test, ['image'])
const {prepare: prepare_two_steps, ...two_steps_rest} = two_steps

const {prepare: prepare_one_step, ...one_step_rest} = setupImages(test, ['image'])


/********
 * Types
 */


export interface RouteRef {
    uuid: string
}

export interface FileItem {
    file: File
}

type ImageRefHolder<K extends string> = {
    [P in `${K}_ref`]: RouteRef
}
type ImageUuidHolder<K extends string> = {
    [P in `${K}_uuid`]: string
}
export type ImageHolder<K extends string> = ImageRefHolder<K> & ImageUuidHolder<K>
export type ImagesPrepared<I extends ImageHolder<K>, K extends string> = Omit<I, ImageOmitKeys<K>[number]> & ImageFinalHolder<K>
type ImageOmitKeys<K extends string> = (keyof ImageHolder<K>)[]
type ImageFinalFile<K extends string> = {
    [P in K]?: File
}
type ImageFinalDelete<K extends string> = {
    [P in `${K}__delete`]?: 1
}
type ImageFinalHolder<K extends string> = ImageFinalFile<K> & ImageFinalDelete<K>


type SetupImageRefsItem<K extends string> = {
    [P in K]: FileItem
}

interface PrepareImages<K extends string> {
    prepare: <R extends ImageHolder<K>>(data: R) => ImagesPrepared<R, K>
}

type SetupImageRefs<K extends string> = SetupImageRefsItem<K>

type SetupImages<K extends string> = SetupImageRefs<K> & PrepareImages<K>

export interface TestInterface {
    name: string
    image_ref: RouteRef
    image_uuid: string
}