From a9348b983b17902e8c7ace8aaa2b5c8823e5cb47 Mon Sep 17 00:00:00 2001
From: Moti Zilberman <motiz88@gmail.com>
Date: Sat, 4 Jun 2016 12:55:41 +0300
Subject: [PATCH] fix(enhancer): Don't blow up when Web MIDI API unavailable

---
 src/index.js                   | 4 +++-
 test/specs/makeMidiEnhancer.js | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 685a206..f38485b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -62,7 +62,9 @@ import observeStore from './observeStore';
 import sortBy from 'lodash.sortby';
 import deepEqual from 'deep-equal';
 
-const defaultRequestMIDIAccess = global && global.navigator && global.navigator.requestMIDIAccess.bind(global.navigator);
+const defaultRequestMIDIAccess = (global && global.navigator && global.navigator.requestMIDIAccess.bind(global.navigator)) || (
+  () => Promise.reject(new Error('Web MIDI API not available'))
+);
 
 /**
  * Create a Redux {@link https://github.com/reactjs/redux/blob/master/docs/Glossary.md#store-enhancer|store enhancer} wrapping MIDI I/O and device discovery.
diff --git a/test/specs/makeMidiEnhancer.js b/test/specs/makeMidiEnhancer.js
index 14c6581..a74c9d1 100644
--- a/test/specs/makeMidiEnhancer.js
+++ b/test/specs/makeMidiEnhancer.js
@@ -1,6 +1,7 @@
 /* eslint-env mocha */
 
 import { makeMidiEnhancer } from '../../src';
+import { createStore } from 'redux';
 
 describe('makeMidiEnhancer', () => {
   it('should be a function', () => {
@@ -9,4 +10,7 @@ describe('makeMidiEnhancer', () => {
   it('should be callable with no arguments', () => {
     (() => makeMidiEnhancer()).should.not.throw;
   });
+  it('should work as a store enhancer', () => {
+    createStore(x => (x || {}), makeMidiEnhancer());
+  });
 });