From fa2c12df3bc65310807dae6d14be0acad78e1b73 Mon Sep 17 00:00:00 2001
From: Lucas Hilgert <77863078+lhilgert9@users.noreply.github.com>
Date: Thu, 30 Oct 2025 12:26:43 +0100
Subject: [PATCH 1/4] fix: fix SourceInspector works behind proxy on subpath

---
 packages/devtools/src/components/source-inspector.tsx | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/packages/devtools/src/components/source-inspector.tsx b/packages/devtools/src/components/source-inspector.tsx
index 88fb58ea..9791129a 100644
--- a/packages/devtools/src/components/source-inspector.tsx
+++ b/packages/devtools/src/components/source-inspector.tsx
@@ -78,11 +78,14 @@ export const SourceInspector = () => {
     e.preventDefault()
     e.stopPropagation()
 
-    fetch(
-      `${location.origin}/__tsd/open-source?source=${encodeURIComponent(
+    const baseUrl = new URL(import.meta.env.BASE_URL, location.origin)
+    const url = new URL(
+      `__tsd/open-source?source=${encodeURIComponent(
         highlightState.dataSource,
       )}`,
-    ).catch(() => {})
+      baseUrl,
+    )
+    fetch(url).catch(() => {})
   })
 
   const currentElementBoxStyles = createMemo(() => {

From e01c2b638d6f2d8a3d24077ff0614e260597ded5 Mon Sep 17 00:00:00 2001
From: Lucas Hilgert <77863078+lhilgert9@users.noreply.github.com>
Date: Thu, 30 Oct 2025 12:44:10 +0100
Subject: [PATCH 2/4] changeset

---
 .changeset/neat-spies-spend.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/neat-spies-spend.md

diff --git a/.changeset/neat-spies-spend.md b/.changeset/neat-spies-spend.md
new file mode 100644
index 00000000..0fcc04c3
--- /dev/null
+++ b/.changeset/neat-spies-spend.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/devtools': minor
+---
+
+fixed an issue where SourceInspector was not working when the app is served to a subpath

From 50cf80d635f706969cd3578f14781e9b6c9585c3 Mon Sep 17 00:00:00 2001
From: Lucas Hilgert <77863078+lhilgert9@users.noreply.github.com>
Date: Thu, 30 Oct 2025 12:45:25 +0100
Subject: [PATCH 3/4] fix changeset to patch

---
 .changeset/neat-spies-spend.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.changeset/neat-spies-spend.md b/.changeset/neat-spies-spend.md
index 0fcc04c3..f643437e 100644
--- a/.changeset/neat-spies-spend.md
+++ b/.changeset/neat-spies-spend.md
@@ -1,5 +1,5 @@
 ---
-'@tanstack/devtools': minor
+'@tanstack/devtools': patch
 ---
 
 fixed an issue where SourceInspector was not working when the app is served to a subpath

From 932cd46965c1c1acb2078ee5872f506d8f40501a Mon Sep 17 00:00:00 2001
From: Lucas Hilgert <77863078+lhilgert9@users.noreply.github.com>
Date: Thu, 30 Oct 2025 13:50:05 +0100
Subject: [PATCH 4/4] ensure changes work in none vite env

---
 packages/devtools/src/components/source-inspector.tsx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/devtools/src/components/source-inspector.tsx b/packages/devtools/src/components/source-inspector.tsx
index 9791129a..b5f51ecb 100644
--- a/packages/devtools/src/components/source-inspector.tsx
+++ b/packages/devtools/src/components/source-inspector.tsx
@@ -78,7 +78,8 @@ export const SourceInspector = () => {
     e.preventDefault()
     e.stopPropagation()
 
-    const baseUrl = new URL(import.meta.env.BASE_URL, location.origin)
+    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+    const baseUrl = new URL(import.meta.env?.BASE_URL ?? '/', location.origin)
     const url = new URL(
       `__tsd/open-source?source=${encodeURIComponent(
         highlightState.dataSource,