Function _cloneDeep

packages/vue-query/src/utils.ts:22–57

(
  value: MaybeRefDeep<T>,
  customize?: (
    val: MaybeRefDeep<T>,
    key: string,
    level: number,
  ) => T | undefined,
  currentKey: string = '',
  currentLevel: number = 0,
)

// Helper function for cloning deep objects where
// the level and key is provided to the callback function.
function _cloneDeep<T>(
  value: MaybeRefDeep<T>,
  customize?: (
    val: MaybeRefDeep<T>,
    key: string,
    level: number,
  ) => T | undefined,
  currentKey: string = '',
  currentLevel: number = 0,
): T {
  if (customize) {
    const result = customize(value, currentKey, currentLevel)
    if (result === undefined && isRef(value)) {
      return result as T
    }
    if (result !== undefined) {
      return result
    }
  }

  if (Array.isArray(value)) {
    return value.map((val, index) =>
      _cloneDeep(val, customize, String(index), currentLevel + 1),
    ) as unknown as T
  }

  if (typeof value === 'object' && isPlainObject(value)) {
    const entries = Object.entries(value).map(([key, val]) => [
      key,
      _cloneDeep(val, customize, key, currentLevel + 1),
    ])
    return Object.fromEntries(entries)
  }

  return value as T
}

export function cloneDeep<T>(
  value: MaybeRefDeep<T>,