import { UnionToIntersection, Stringify } from './types.js';

type Pretty<T> = {
    [P in keyof T]: T[P];
} & {};
type NestedObject<T = unknown> = {
    [_: ObjectKey]: T | NestedObject<T>;
};
/**
 * Flattening an object
 * input
 * const a = {
 *   b: { c: 'd' }
 * }
 *
 * output
 * const a = {
 *   b.c: 'd'
 * }
 */
declare function flattenObject<const T, T2 extends NestedObject<T>>(object: T2): FlattenObject<T2>;
/**
 * Flattening an object
 * input
 * const a = {
 *   b: { c: 'd' }
 * }
 *
 * output
 * const a = {
 *   b.c: 'd'
 * }
 */
type FlattenObject<T extends NestedObject, RestKey extends string = ""> = UnionToIntersection<T extends Record<infer Key, unknown> ? Key extends string | number ? T[Key] extends NestedObject ? FlattenObject<T[Key], RestKey extends "" ? Stringify<Key> : `${RestKey}.${Stringify<Key>}`> : Record<RestKey extends "" ? Stringify<Key> : `${RestKey}.${Stringify<Key>}`, T[Key]> : never : never>;

export { FlattenObject, NestedObject, Pretty, flattenObject };