Function cloneDeep

packages/apollo-utilities/src/util/cloneDeep.ts:6–8

(value: T)

 * Deeply clones a value to create a new instance.
 */
export function cloneDeep<T>(value: T): T {
  return cloneDeepHelper(value, new Map());
}

function cloneDeepHelper<T>(val: T, seen: Map<any, any>): T {
  switch (toString.call(val)) {