From 8c8a22add47693e9e2c9b1e7bfedd4dd4cf56469 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Tue, 27 Jan 2026 19:06:24 -0500
Subject: [PATCH] fix: prevent unintended exports from namespaces (#17562)

---
 .changeset/stale-words-count.md  |  5 +++++
 packages/svelte/src/ambient.d.ts | 21 +++++++++++++++++++++
 packages/svelte/types/index.d.ts | 21 +++++++++++++++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 .changeset/stale-words-count.md

diff --git a/.changeset/stale-words-count.md b/.changeset/stale-words-count.md
new file mode 100644
index 0000000000..d8d8c3102e
--- /dev/null
+++ b/.changeset/stale-words-count.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: prevent unintended exports from namespaces
diff --git a/packages/svelte/src/ambient.d.ts b/packages/svelte/src/ambient.d.ts
index 823dbde9a4..ec5b799470 100644
--- a/packages/svelte/src/ambient.d.ts
+++ b/packages/svelte/src/ambient.d.ts
@@ -173,6 +173,9 @@ declare namespace $state {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -230,6 +233,9 @@ declare namespace $derived {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -346,6 +352,9 @@ declare namespace $effect {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -389,6 +398,9 @@ declare namespace $props {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -423,6 +435,9 @@ declare namespace $bindable {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -485,6 +500,9 @@ declare namespace $inspect {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -529,4 +547,7 @@ declare namespace $host {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
diff --git a/packages/svelte/types/index.d.ts b/packages/svelte/types/index.d.ts
index 9e569126bb..128de134ed 100644
--- a/packages/svelte/types/index.d.ts
+++ b/packages/svelte/types/index.d.ts
@@ -3345,6 +3345,9 @@ declare namespace $state {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -3402,6 +3405,9 @@ declare namespace $derived {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -3518,6 +3524,9 @@ declare namespace $effect {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -3561,6 +3570,9 @@ declare namespace $props {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -3595,6 +3607,9 @@ declare namespace $bindable {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -3657,6 +3672,9 @@ declare namespace $inspect {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 /**
@@ -3701,6 +3719,9 @@ declare namespace $host {
 	export const prototype: never;
 	/** @deprecated */
 	export const toString: never;
+
+	// needed to keep private stuff private
+	export {};
 }
 
 //# sourceMappingURL=index.d.ts.map