From 10faafd13853da8549a1bd9625208e5f026eb203 Mon Sep 17 00:00:00 2001
From: Jonathan Lonowski <coiscir@gmail.com>
Date: Sun, 3 Apr 2016 20:35:55 -0500
Subject: [PATCH 1/2] Avoid replacing existing `toJSON` definitions.

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

diff --git a/index.js b/index.js
index d92103f..8f54650 100644
--- a/index.js
+++ b/index.js
@@ -1,3 +1,4 @@
+if (!('toJSON' in Error.prototype))
 Object.defineProperty(Error.prototype, 'toJSON', {
     value: function () {
         var alt = {};

From f78f10f3a8548c2e085aa6c9baab9151ddc26ae0 Mon Sep 17 00:00:00 2001
From: Jonathan Lonowski <coiscir@gmail.com>
Date: Mon, 4 Apr 2016 21:43:41 -0500
Subject: [PATCH 2/2] Revise to exit module if `toJSON` is already defined.

AVVS/error-tojson#3
---
 index.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 8f54650..b4af5b7 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,7 @@
-if (!('toJSON' in Error.prototype))
+if ('toJSON' in Error.prototype) {
+  return;
+}
+
 Object.defineProperty(Error.prototype, 'toJSON', {
     value: function () {
         var alt = {};