// @flow type TransformConfig = { whitelist?: Array, blacklist?: Array, } export default function createTransform( // @NOTE inbound: transform state coming from redux on its way to being serialized and stored inbound: ?Function, // @NOTE outbound: transform state coming from storage, on its way to be rehydrated into redux outbound: ?Function, config: TransformConfig = {} ) { let whitelist = config.whitelist || null let blacklist = config.blacklist || null function whitelistBlacklistCheck(key) { if (whitelist && whitelist.indexOf(key) === -1) return true if (blacklist && blacklist.indexOf(key) !== -1) return true return false } return { in: (state: Object, key: string, fullState: Object) => !whitelistBlacklistCheck(key) && inbound ? inbound(state, key, fullState) : state, out: (state: Object, key: string, fullState: Object) => !whitelistBlacklistCheck(key) && outbound ? outbound(state, key, fullState) : state, } }