(refactor): export AsyncLocalStorage as object

- will need to export more from here with TS, like an interface, so
  won't be able to `import * as` in the future
- also give it a default export

src/asyncLocalStorage.js

@@ -1,17 +1,16 @@
-export function clear () {
-  return callWithPromise(window.localStorage.clear)
-}
-
-export function getItem (key) {
-  return callWithPromise(window.localStorage.getItem, key)
-}
-
-export function removeItem (key) {
-  return callWithPromise(window.localStorage.removeItem, key)
-}
-
-export function setItem (key, value) {
-  return callWithPromise(window.localStorage.setItem, key, value)
+export const AsyncLocalStorage = {
+  clear () {
+    return callWithPromise(window.localStorage.clear)
+  },
+  getItem (key) {
+    return callWithPromise(window.localStorage.getItem, key)
+  },
+  removeItem (key) {
+    return callWithPromise(window.localStorage.removeItem, key)
+  },
+  setItem (key, value) {
+    return callWithPromise(window.localStorage.setItem, key, value)
+  }
 }
 
 function callWithPromise (func, ...args) {
@@ -21,3 +20,5 @@ function callWithPromise (func, ...args) {
     return Promise.reject(err)
   }
 }
+
+export default AsyncLocalStorage

src/index.js

@@ -1,6 +1,6 @@
 import { onSnapshot, applySnapshot } from 'mobx-state-tree'
 
-import * as AsyncLocalStorage from './asyncLocalStorage.js'
+import AsyncLocalStorage from './asyncLocalStorage.js'
 
 export const persist = (name, store, options = {}) => {
   let {storage, jsonify, whitelist, blacklist} = options