Function createJSONStorage

src/middleware/persist.ts:31–61

(
  getStorage: () => StateStorage<R>,
  options?: JsonStorageOptions,
)

}

export function createJSONStorage<S, R = unknown>(
  getStorage: () => StateStorage<R>,
  options?: JsonStorageOptions,
): PersistStorage<S, unknown> | undefined {
  let storage: StateStorage<R> | undefined
  try {
    storage = getStorage()
  } catch {
    // prevent error if the storage is not defined (e.g. when server side rendering a page)
    return
  }
  const persistStorage: PersistStorage<S, R> = {
    getItem: (name) => {
      const parse = (str: string | null) => {
        if (str === null) {
          return null
        }
        return JSON.parse(str, options?.reviver) as StorageValue<S>
      }
      const str = storage.getItem(name) ?? null
      if (str instanceof Promise) {
        return str.then(parse)
      }
      return parse(str)
    },
    setItem: (name, newValue) =>
      storage.setItem(name, JSON.stringify(newValue, options?.replacer)),
    removeItem: (name) => storage.removeItem(name),
  }
  return persistStorage
}

export interface PersistOptions<
  S,