Typescript utility for simplifying an object or array type recursively to its most basic representation

simplify.ts

/**
 * Simplifies an object or array type recursively to its most basic representation.
 *
 * @example
 * // Complex nested type
 * type Complex = Array<
 *   SerializeObject<{
 *     data: Array<SerializeObject<{ date: number } & { name: string } & { amount: number }>>;
 *     metadata: { date: Date } & { name: string } & { amount: number };
 *   }>
 * >;
 *
 * // Using Simplify to flatten the structure
 * type Simple = Simplify<Complex>;
 * // Result: {
 * //   data: { date: string; name: string; amount: number }[];
 * //   metadata: { date: string; name: string; amount: number };
 * // }[]
 */
export type Simplify<T> =
  T extends Array<infer Shape>
    ? Array<Simplify<Shape>>
    : T extends Date
      ? Date
      : T extends object
        ? {
            [K in keyof T]: Simplify<T[K]>;
          }
        : T;