import {Iteration} from './Iteration'
import {Formats} from './_Internal'

/** Is **`Key`** and **`Pos`** in a single type
 * @param I to query
 * @param fmt output
 * @returns **`string | number`**
 * @example
 * ```ts
 * import {I} from 'ts-toolbelt'
 *
 * /// Let's make '20' an iteration
 * type i = I.IterationOf<'20'> // [...]

 * type fmtS = I.Fmt<i, 's'> // '20'
 * type fmtN = I.Fmt<i, 'n'> //  20
 * ```
 */
export type Format<I extends Iteration, fmt extends Formats> = {
    's': I[2]
    'n': I[3]
}[fmt]