From 677d85de1c04f7fc5ddabe31fb4b7815afd068e4 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Sat, 13 May 2017 02:01:22 -0700
Subject: [PATCH] node: make plugin methods optional.

---
 lib/node/node.js | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/lib/node/node.js b/lib/node/node.js
index d7014239..e600741e 100644
--- a/lib/node/node.js
+++ b/lib/node/node.js
@@ -296,8 +296,10 @@ Node.prototype.use = function use(plugin) {
 
   instance = plugin.init(this);
 
-  assert(typeof instance.open === 'function', '`open` must be a function.');
-  assert(typeof instance.close === 'function', '`close` must be a function.');
+  assert(!instance.open || typeof instance.open === 'function',
+    '`open` must be a function.');
+  assert(!instance.close || typeof instance.close === 'function',
+    '`close` must be a function.');
 
   if (plugin.id) {
     assert(typeof plugin.id === 'string', '`id` must be a string.');
@@ -407,7 +409,8 @@ Node.prototype.openPlugins = co(function* openPlugins() {
 
   for (i = 0; i < this.stack.length; i++) {
     plugin = this.stack[i];
-    yield plugin.open();
+    if (plugin.open)
+      yield plugin.open();
   }
 });
 
@@ -421,7 +424,8 @@ Node.prototype.closePlugins = co(function* closePlugins() {
 
   for (i = 0; i < this.stack.length; i++) {
     plugin = this.stack[i];
-    yield plugin.close();
+    if (plugin.close)
+      yield plugin.close();
   }
 });