From 92a5cfc0e6960913ae892a1b7518e43b361d682f Mon Sep 17 00:00:00 2001
From: Wali Mohammad Kadri <kadriwalimohammad@gmail.com>
Date: Sun, 29 Jun 2025 04:33:36 +0530
Subject: [PATCH 1/4] fix(types): export FetcherResponse type

Fixes #3038
---
 src/index/index.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/index/index.ts b/src/index/index.ts
index 2ae26b143..559a5e418 100644
--- a/src/index/index.ts
+++ b/src/index/index.ts
@@ -32,5 +32,6 @@ export type {
   Middleware,
   Arguments,
   State,
-  ScopedMutator
+  ScopedMutator,
+  FetcherResponse
 } from '../_internal'

From 2bc18a217561ccd9720c001862e630d406789fe0 Mon Sep 17 00:00:00 2001
From: Wali Mohammad Kadri <kadriwalimohammad@gmail.com>
Date: Sun, 29 Jun 2025 04:47:27 +0530
Subject: [PATCH 2/4] fix(loading): Prevent isLoading from being true with
 fallbackData

When `fallbackData` is provided, `isLoading` should not be true initially.
Instead, `isValidating` should be true to indicate background revalidation.
This prevents a "flash of skeleton" UI when initial data is available.

Fixes #3046
---
 src/index/use-swr.ts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/index/use-swr.ts b/src/index/use-swr.ts
index 21c42a9c2..291f43ee2 100644
--- a/src/index/use-swr.ts
+++ b/src/index/use-swr.ts
@@ -195,7 +195,7 @@ export const useSWRHandler = <Data = any, Error = any>(
 
       return {
         isValidating: true,
-        isLoading: true,
+        isLoading: isUndefined(fallback),
         ...snapshot
       }
     }
@@ -278,8 +278,8 @@ export const useSWRHandler = <Data = any, Error = any>(
 
   const returnedData = keepPreviousData
     ? isUndefined(cachedData)
-      // checking undefined to avoid null being fallback as well
-      ? isUndefined(laggyDataRef.current)
+      ? // checking undefined to avoid null being fallback as well
+        isUndefined(laggyDataRef.current)
         ? data
         : laggyDataRef.current
       : cachedData
@@ -390,7 +390,7 @@ export const useSWRHandler = <Data = any, Error = any>(
       const initialState: State<Data, Error> = { isValidating: true }
       // It is in the `isLoading` state, if and only if there is no cached data.
       // This bypasses fallback data and laggy data.
-      if (isUndefined(getCache().data)) {
+      if (isUndefined(getCache().data) && isUndefined(fallback)) {
         initialState.isLoading = true
       }
       try {

From 03d953a702e475711664aa39f823aa358013aea4 Mon Sep 17 00:00:00 2001
From: Wali Mohammad Kadri <kadriwalimohammad@gmail.com>
Date: Sun, 29 Jun 2025 04:49:03 +0530
Subject: [PATCH 3/4] Revert "fix(loading): Prevent isLoading from being true
 with fallbackData"

This reverts commit 2bc18a217561ccd9720c001862e630d406789fe0.
---
 src/index/use-swr.ts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/index/use-swr.ts b/src/index/use-swr.ts
index 291f43ee2..21c42a9c2 100644
--- a/src/index/use-swr.ts
+++ b/src/index/use-swr.ts
@@ -195,7 +195,7 @@ export const useSWRHandler = <Data = any, Error = any>(
 
       return {
         isValidating: true,
-        isLoading: isUndefined(fallback),
+        isLoading: true,
         ...snapshot
       }
     }
@@ -278,8 +278,8 @@ export const useSWRHandler = <Data = any, Error = any>(
 
   const returnedData = keepPreviousData
     ? isUndefined(cachedData)
-      ? // checking undefined to avoid null being fallback as well
-        isUndefined(laggyDataRef.current)
+      // checking undefined to avoid null being fallback as well
+      ? isUndefined(laggyDataRef.current)
         ? data
         : laggyDataRef.current
       : cachedData
@@ -390,7 +390,7 @@ export const useSWRHandler = <Data = any, Error = any>(
       const initialState: State<Data, Error> = { isValidating: true }
       // It is in the `isLoading` state, if and only if there is no cached data.
       // This bypasses fallback data and laggy data.
-      if (isUndefined(getCache().data) && isUndefined(fallback)) {
+      if (isUndefined(getCache().data)) {
         initialState.isLoading = true
       }
       try {

From e2f11af62f712063022e8331e8931d6de24c9320 Mon Sep 17 00:00:00 2001
From: Wali Mohammad Kadri <kadriwalimohammad@gmail.com>
Date: Sun, 29 Jun 2025 04:49:47 +0530
Subject: [PATCH 4/4] fix(loading): Prevent isLoading from being true with
 fallbackData

When `fallbackData` is provided, `isLoading` should not be true initially.
Instead, `isValidating` should be true to indicate background revalidation.
This prevents a "flash of skeleton" UI when initial data is available.

Fixes #3046
---
 src/index/use-swr.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/index/use-swr.ts b/src/index/use-swr.ts
index 21c42a9c2..b660a054f 100644
--- a/src/index/use-swr.ts
+++ b/src/index/use-swr.ts
@@ -195,7 +195,7 @@ export const useSWRHandler = <Data = any, Error = any>(
 
       return {
         isValidating: true,
-        isLoading: true,
+        isLoading: isUndefined(fallback),
         ...snapshot
       }
     }
@@ -278,8 +278,8 @@ export const useSWRHandler = <Data = any, Error = any>(
 
   const returnedData = keepPreviousData
     ? isUndefined(cachedData)
-      // checking undefined to avoid null being fallback as well
-      ? isUndefined(laggyDataRef.current)
+      ? // checking undefined to avoid null being fallback as well
+        isUndefined(laggyDataRef.current)
         ? data
         : laggyDataRef.current
       : cachedData