TypeScript type that removes nullable properties from a collection (object or array)

nonNullableCollection.ts

/**
 * Removes nullable properties (with `null` or `undefined` values) from an object or array.
 * @template T The object or array to remove nullable properties from.
 * @see https://gist.github.com/albertms10/fb5a6d87a97db584086241d5bad74a41
 * @example
 * type A = { a?: string; b: null; c?: number | null };
 * type B = NonNullableCollection<A>;
 * // { a: string; c: number; }
 * @example
 * type A = [string, undefined, number, null];
 * type B = NonNullableCollection<A>;
 * // (string | number)[]
 */
export type NonNullableCollection<T> = T extends (infer U)[]
  ? Exclude<U, null | undefined>[]
  : {
      [K in keyof T as NonNullable<T[K]> extends never ? never : K]-?: Exclude<
        T[K],
        null | undefined
      >;
    };