make deserialize/serialize of config consistent; optimize if-else statement for getStoredState.js & createPersistoid.js

Author: scott1028

src/createPersistoid.js

@@ -16,9 +16,13 @@ export default function createPersistoid(config: PersistConfig): Persistoid {
     config.keyPrefix !== undefined ? config.keyPrefix : KEY_PREFIX
   }${config.key}`
   const storage = config.storage
-  let serialize = config.serialize === false ? x => x : defaultSerialize
-  if (typeof config.serialize === 'function') {
+  let serialize
+  if (!config.serialize) {
+    serialize = defaultSerialize
+  } else if (typeof config.serialize === 'function') {
     serialize = config.serialize
+  } else {
+    serialize = x => x
   }
   const writeFailHandler = config.writeFailHandler || null
 

src/getStoredState.js

@@ -13,9 +13,13 @@ export default function getStoredState(
   }${config.key}`
   const storage = config.storage
   const debug = config.debug
-  let deserialize = config.serialize === false ? x => x : defaultDeserialize
-  if (typeof config.deserialize === 'function') {
+  let deserialize
+  if (!config.deserialize) {
+    deserialize = defaultDeserialize
+  } else if (typeof config.deserialize === 'function') {
     deserialize = config.deserialize
+  } else {
+    deserialize = x => x
   }
   return storage.getItem(storageKey).then(serialized => {
     if (!serialized) return undefined

src/types.js

@@ -24,7 +24,7 @@ export type PersistConfig = {
   getStoredState?: PersistConfig => Promise<PersistedState>, // used for migrations
   debug?: boolean,
   serialize?: boolean | Function,
-  deserialize?: Function | null,
+  deserialize?: boolean | Function,
   timeout?: number,
   writeFailHandler?: Function,
 }