From f0e599fea1fbe34c69dbaf1f10d574a1961b3130 Mon Sep 17 00:00:00 2001
From: Braydon Fuller <braydon@bitpay.com>
Date: Tue, 27 Oct 2015 12:46:14 -0400
Subject: [PATCH] Return node version check and include additional v4 engine.

---
 index.js     | 11 +++++++++++
 package.json |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index da3b0539..4b2aa56a 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,17 @@
 'use strict';
 
+var semver = require('semver');
+var packageData = require('./package.json');
+
+function nodeVersionCheck(version, expected) {
+  if (!semver.satisfies(version, expected)) {
+    throw new Error('Node.js version ' + version + ' is expected to be ' + expected);
+  }
+}
+nodeVersionCheck(process.versions.node, packageData.engines.node);
+
 module.exports = require('./lib');
+module.exports.nodeVersionCheck = nodeVersionCheck;
 module.exports.Node = require('./lib/node');
 module.exports.Transaction = require('./lib/transaction');
 module.exports.Service = require('./lib/service');
diff --git a/package.json b/package.json
index b2bcfbf2..f3d17f90 100644
--- a/package.json
+++ b/package.json
@@ -78,7 +78,7 @@
     "bitcore-p2p": "~1.0.0"
   },
   "engines": {
-    "node": "^0.12"
+    "node": "^0.12 || ^4.2"
   },
   "os": [
     "darwin",