From 9e9949c5b0ababa9207ec1f5d916feeb6ae49e6f Mon Sep 17 00:00:00 2001
From: Andrew Leedham <AndrewLeedham@Outlook.com>
Date: Tue, 19 Mar 2019 16:03:49 +0000
Subject: [PATCH] fix(node-fetch): make systemError optional

---
 types/node-fetch/index.d.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/types/node-fetch/index.d.ts b/types/node-fetch/index.d.ts
index 03ae639d26..8883dc1b9d 100644
--- a/types/node-fetch/index.d.ts
+++ b/types/node-fetch/index.d.ts
@@ -4,6 +4,7 @@
 //                 Niklas Lindgren <https://github.com/nikcorg>
 //                 Vinay Bedre <https://github.com/vinaybedre>
 //                 Antonio Román <https://github.com/kyranet>
+//                 Andrew Leedham <https://github.com/AndrewLeedham>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /// <reference types="node" />
@@ -134,7 +135,7 @@ export class Body {
 
 export class FetchError extends Error {
     name: "FetchError";
-    constructor(message: string, type: string, systemError: string);
+    constructor(message: string, type: string, systemError?: string);
     type: string;
     code?: string;
     errno?: string;