From be4f7b33f4f0885f2c0f5f4d537f6e9793f3fa30 Mon Sep 17 00:00:00 2001
From: kumavis <aaron@kumavis.me>
Date: Fri, 6 Oct 2017 12:36:08 -0700
Subject: nodeify - allow callback to be optional

---
 app/scripts/lib/nodeify.js | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/app/scripts/lib/nodeify.js b/app/scripts/lib/nodeify.js
index 832d6c6d3..19c3c8337 100644
--- a/app/scripts/lib/nodeify.js
+++ b/app/scripts/lib/nodeify.js
@@ -1,10 +1,18 @@
 const promiseToCallback = require('promise-to-callback')
+const noop = function(){}
 
 module.exports = function nodeify (fn, context) {
   return function(){
     const args = [].slice.call(arguments)
-    const callback = args.pop()
-    if (typeof callback !== 'function') throw new Error('callback is not a function')
+    const lastArg = args[args.length-1]
+    const lastArgIsCallback = typeof lastArg === 'function'
+    let callback
+    if (lastArgIsCallback) {
+      callback = lastArg
+      args.pop()
+    } else {
+      callback = noop
+    }
     promiseToCallback(fn.apply(context, args))(callback)
   }
 }
-- 
cgit