optimization code

index.d.ts

@@ -1,3 +1,10 @@
+interface MapLike<K, V> {
+  get(key: K): Promise<any>;
+  set(key: K, value: V): Promise<boolean>;
+  delete(key: K): Promise<boolean>;
+  clear(): Promise<void>;
+}
+
 interface iOptions {
   /** Namespace for the current instance. */
   prefix?: string;
@@ -6,7 +13,7 @@ interface iOptions {
   /** A custom deserialization function. */
   deserialize?: (data: string) => any;
   /** The storage adapter instance to be used by MaybeStore. */
-  store?: any;
+  store?: MapLike<string, any>;
   /** Default TTL. Can be overridden by specififying a TTL on `.set()`. */
   ttl?: number;
 }

index.js

@@ -9,11 +9,7 @@ const defaultOption = {
   }),
 };
 
-function pTry(cb) {
-  return new Promise((resolve) => {
-    resolve(cb());
-  });
-}
+const pTry = cb => new Promise(resolve => resolve(cb()));
 
 class MaybeStore {
   constructor(opts = {}) {

test/index.js

@@ -113,3 +113,14 @@ test('MaybeStore throw Error', async (t) => {
   const error = await t.throws(mStore.set('foo', 'bar'));
   t.is(error.message, 'serialize error');
 });
+
+test('MaybeStore throw Error store.set', async (t) => {
+  const store = {
+    set() {
+      throw Error('store.set error');
+    },
+  };
+  const mStore = new MaybeStore({ store });
+  const error = await t.throws(mStore.set('foo', 'bar'));
+  t.is(error.message, 'store.set error');
+});