From fb6f990b538bda1beac2115a3077a51e6597c62a Mon Sep 17 00:00:00 2001
From: Mark Birbeck <mark.birbeck@gmail.com>
Date: Tue, 7 Mar 2017 14:29:34 +0000
Subject: [PATCH 1/2] add failing test

---
 test/yargs-parser.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/yargs-parser.js b/test/yargs-parser.js
index 5b59c615..6356c3ab 100644
--- a/test/yargs-parser.js
+++ b/test/yargs-parser.js
@@ -444,6 +444,18 @@ describe('yargs-parser', function () {
       argv.should.have.property('foo').and.deep.equal('baz')
     })
 
+    it('should combine values from config file and argv, if argv value is an array', function () {
+      var argv = parser(['--foo', 'bar'], {
+        config: ['settings'],
+        array: ['foo'],
+        default: {
+          settings: jsonPath
+        }
+      })
+
+      argv.should.have.property('foo').and.deep.equal(['bar', 'baz'])
+    })
+
     it('should use value from config file, if argv key is a boolean', function () {
       var argv = parser([], {
         config: ['settings'],

From e3b3629799c93e243de8f5673f3ead6cc20c2c73 Mon Sep 17 00:00:00 2001
From: Mark Birbeck <mark.birbeck@gmail.com>
Date: Tue, 7 Mar 2017 14:37:11 +0000
Subject: [PATCH 2/2] merge config file values with argv if item is an array
 (rather than overwriting)

---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index b71faf58..79922307 100644
--- a/index.js
+++ b/index.js
@@ -468,7 +468,7 @@ function parse (args, opts) {
       } else {
         // setting arguments via CLI takes precedence over
         // values within the config file.
-        if (!hasKey(argv, fullKey.split('.')) || (flags.defaulted[fullKey])) {
+        if (!hasKey(argv, fullKey.split('.')) || (flags.defaulted[fullKey]) || (flags.arrays[fullKey])) {
           setArg(fullKey, value)
         }
       }