import {Partial as OPartial} from '../Object/Partial'
import {Depth} from '../Object/_Internal'
import {Cast} from '../Any/Cast'
import {List} from './List'

/**
Make all fields of `O` optional (deeply or not)
@param L to make optional
@param depth (?=`'flat'`) to do it deeply
@returns [[List]]
@example
```ts
import {O} from 'ts-toolbelt'

type L = [1, 2, 3, [4, [5]]]

type test0 = O.Partial<L>
type test1 = O.Partial<L, 'deep'>
```
*/
export type Partial<L extends List, depth extends Depth = 'flat'> =
    Cast<OPartial<L, depth>, List>