rambda/_ts-toolbelt/src/String/Format.ts

Lightweight faster alternative to Ramda

import {Formats} from './_Internal'
import {Pos} from '../Iteration/Pos'
import {IterationOf} from '../Iteration/IterationOf'
import {False, True} from '../Boolean/Boolean'
import {Extends} from '../Any/Extends'

/** Change the format of a **`string`**
 * @param S to transform
 * @returns **`string | number | boolean`**
 * @example
 * ```ts
 * import {S} from 'ts-toolbelt'
 *
 * type test0 = S.Format<'30', 'b'> // True
 * type test1 = S.Format<'30', 'n'> // 30
 * ```
 */
export type Format<S extends string, fmt extends Formats> = {
    'b': {
        1: Boolean
        0: S extends 'false'
           ? False
           : True
    }[Extends<string, S>]
    'n': Pos<IterationOf<S>>
    's': S
}[fmt]