Function deepCopy

src/shared/Util.ts:216–226

(source: T)

 * @returns New copy of source
 */
export function deepCopy<T>(source: T): T {
  const copy: any = Array.isArray(source) ? [] : {};
  for (const key in source) {
    let val = source[key];
    if (val !== null && typeof val === 'object') {
      val = deepCopy(val);
    }
    copy[key] = val;
  }
  return copy;
}

/**
 * Recursively go down a folder and call back for each file encountered