From 5c24342a54f06dc15f557bc03d44b49225270e77 Mon Sep 17 00:00:00 2001
From: Ilya Semenov <ilya@semenov.co>
Date: Wed, 7 Jun 2023 01:51:35 +0700
Subject: [PATCH] fix: pass empty object to headers initializer to prevent
 crash on chrome 49 (#235)

---
 src/fetch.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/fetch.ts b/src/fetch.ts
index cd9ebf5..4487df9 100644
--- a/src/fetch.ts
+++ b/src/fetch.ts
@@ -160,7 +160,8 @@ export function createFetch(globalOptions: CreateFetchOptions): $Fetch {
 
         // Set Content-Type and Accept headers to application/json by default
         // for JSON serializable request bodies.
-        context.options.headers = new Headers(context.options.headers);
+        // Pass empty object as older browsers don't support undefined.
+        context.options.headers = new Headers(context.options.headers || {});
         if (!context.options.headers.has("content-type")) {
           context.options.headers.set("content-type", "application/json");
         }