From 59694fed4b972052fdf438037df1ef5205cc521d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gautier=20Ben=20A=C3=AFm?=
 <48261497+GauBen@users.noreply.github.com>
Date: Sat, 15 Jan 2022 18:39:24 +0100
Subject: [PATCH] [fix] make properties overwritable (#3356) (#3357)

---
 .changeset/cyan-schools-kiss.md   | 5 +++++
 packages/kit/src/install-fetch.js | 4 ++++
 2 files changed, 9 insertions(+)
 create mode 100644 .changeset/cyan-schools-kiss.md

diff --git a/.changeset/cyan-schools-kiss.md b/.changeset/cyan-schools-kiss.md
new file mode 100644
index 000000000000..da3cd06d3dfd
--- /dev/null
+++ b/.changeset/cyan-schools-kiss.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Allow \_\_fetch_polyfill() to run several times
diff --git a/packages/kit/src/install-fetch.js b/packages/kit/src/install-fetch.js
index 629e38884996..aee7971d76c5 100644
--- a/packages/kit/src/install-fetch.js
+++ b/packages/kit/src/install-fetch.js
@@ -5,18 +5,22 @@ export function __fetch_polyfill() {
 	Object.defineProperties(globalThis, {
 		fetch: {
 			enumerable: true,
+			configurable: true,
 			value: fetch
 		},
 		Response: {
 			enumerable: true,
+			configurable: true,
 			value: Response
 		},
 		Request: {
 			enumerable: true,
+			configurable: true,
 			value: Request
 		},
 		Headers: {
 			enumerable: true,
+			configurable: true,
 			value: Headers
 		}
 	});