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