import { Extends } from '../../commonness/Extends';
import { If } from '../../commonness/If';
/**
 *
 * Convert a union type to an object
 *
 * 유니온 타입을 객체로 변환하는 타입
 *
 * @param T Union type / 유니온 타입
 *
 * @returns Object / 객체
 *
 * @example
 * type cases = [
 *   Expect<Equal<ToObject<'a' | 'b' | 'c'>, { a: 'a'; b: 'b'; c: 'c' }>>,
 *   Expect<Equal<ToObject<'a'>, { a: 'a' }>>,
 *   Expect<Equal<ToObject<string>, { [x: string]: string }>>,
 *   Expect<Equal<ToObject<'a' | 1>, { a: 'a'; 1: 1 }>>,
 *   Expect<Equal<ToObject<never>, {}>>,
 * ]
 *
 * @link https://www.utilscript.site/docs/usage-union/to-object
 *
 */
export type ToObject<T extends PropertyKey> = {
    [K in T as If<Extends<K, PropertyKey>, K, never>]: K;
};