// @flow import type { PersistConfig } from './types' import { KEY_PREFIX } from './constants' export default function getStoredState( config: PersistConfig ): Promise { const transforms = config.transforms || [] const storageKey = `${ config.keyPrefix !== undefined ? config.keyPrefix : KEY_PREFIX }${config.key}` const storage = config.storage const debug = config.debug let deserialize if (config.deserialize === false) { deserialize = x => x } else if (typeof config.deserialize === 'function') { deserialize = config.deserialize } else { deserialize = defaultDeserialize } return storage.getItem(storageKey).then(serialized => { if (!serialized) return undefined else { try { let state = {} let rawState = deserialize(serialized) Object.keys(rawState).forEach(key => { state[key] = transforms.reduceRight((subState, transformer) => { return transformer.out(subState, key, rawState) }, deserialize(rawState[key])) }) return state } catch (err) { if (process.env.NODE_ENV !== 'production' && debug) console.log( `redux-persist/getStoredState: Error restoring data ${serialized}`, err ) throw err } } }) } function defaultDeserialize(serial) { return JSON.parse(serial) }