From d56562b3ac9777d3c35f94a72b1b9a80150ea159 Mon Sep 17 00:00:00 2001
From: Clawdbot <bot@clawdbot.dev>
Date: Wed, 18 Mar 2026 12:22:42 +0800
Subject: [PATCH] fix: useSWRImmutable should disable revalidation on focus

Fixes vercel/swr#4225

useSWRImmutable is documented to disable all automatic revalidation,
but revalidateOnFocus was not being set to false by default.

Changed the immutable middleware to create a new config object with
explicit overrides instead of mutating the config, ensuring:
- revalidateOnFocus
- revalidateIfStale
- revalidateOnReconnect
- refreshInterval

are all properly disabled.
---
 src/immutable/index.ts | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/immutable/index.ts b/src/immutable/index.ts
index 573eca3c3..3bad3caa7 100644
--- a/src/immutable/index.ts
+++ b/src/immutable/index.ts
@@ -4,11 +4,13 @@ import { withMiddleware } from '../_internal'
 
 export const immutable: Middleware = useSWRNext => (key, fetcher, config) => {
   // Always override all revalidate options.
-  config.revalidateOnFocus = false
-  config.revalidateIfStale = false
-  config.revalidateOnReconnect = false
-  config.refreshInterval = 0
-  return useSWRNext(key, fetcher, config)
+  return useSWRNext(key, fetcher, {
+    ...config,
+    revalidateOnFocus: false,
+    revalidateIfStale: false,
+    revalidateOnReconnect: false,
+    refreshInterval: 0
+  })
 }
 
 const useSWRImmutable = withMiddleware(useSWR, immutable)