export function deepCopy<T>(obj: T, keys?: string[]): T {
  // Handle Object
  if (obj instanceof String) {
    return (obj + '') as unknown as T;
  } else if (obj instanceof Date) {
    return new Date(obj.getTime()) as unknown as T;
  } else if (obj instanceof Array) {
    const copy = Array(obj.length);
    for (let i = 0, len = obj.length; i < len; i++) {
      copy[i] = deepCopy(obj[i]);
    }
    return copy as unknown as T;
  } else if (obj instanceof Set) {
    const copy = new Set();
    obj.forEach(value => {
      copy.add(deepCopy(value));
    });
    return copy as unknown as T;
  } else if (obj instanceof Map) {
    const copy = new Map();
    obj.forEach((value, key) => {
      copy.set(key, deepCopy(value));
    });
    return copy as unknown as T;
  } else if (obj instanceof Object) {
    const copy: { [key: string]: any } = {};
    for (const attr in obj) {
      if (typeof keys !== 'undefined' && !keys.includes(attr)) {
        continue;
      }
      if (Object.getOwnPropertyNames(obj).includes(attr)) copy[attr] = deepCopy((obj as { [key: string]: any })[attr]);
    }
    return copy as unknown as T;
  } else {
    return obj;
  }
}