From 227945d242064db880569cc74c1444a3a27e7cd4 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Thu, 28 Mar 2024 21:24:40 -0400
Subject: [PATCH] feat: re-export built-ins from `svelte/reactivity` on the
 server (#10973)

* chore: re-export builtins from svelte/reactivity on the server

* changeset

* fix
---
 .changeset/neat-files-rescue.md                              | 5 +++++
 packages/svelte/package.json                                 | 3 ++-
 packages/svelte/scripts/generate-types.js                    | 2 +-
 packages/svelte/src/reactivity/{index.js => index-client.js} | 0
 packages/svelte/src/reactivity/index-server.js               | 3 +++
 5 files changed, 11 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/neat-files-rescue.md
 rename packages/svelte/src/reactivity/{index.js => index-client.js} (100%)
 create mode 100644 packages/svelte/src/reactivity/index-server.js

diff --git a/.changeset/neat-files-rescue.md b/.changeset/neat-files-rescue.md
new file mode 100644
index 0000000000..667e70ddfc
--- /dev/null
+++ b/.changeset/neat-files-rescue.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+feat: re-export built-ins from `svelte/reactivity` on the server
diff --git a/packages/svelte/package.json b/packages/svelte/package.json
index b682b6cd78..a6b727b66b 100644
--- a/packages/svelte/package.json
+++ b/packages/svelte/package.json
@@ -64,7 +64,8 @@
     },
     "./reactivity": {
       "types": "./types/index.d.ts",
-      "default": "./src/reactivity/index.js"
+      "browser": "./src/reactivity/index-client.js",
+      "default": "./src/reactivity/index-server.js"
     },
     "./server": {
       "types": "./types/index.d.ts",
diff --git a/packages/svelte/scripts/generate-types.js b/packages/svelte/scripts/generate-types.js
index a28ccdaa8b..c52693f5f3 100644
--- a/packages/svelte/scripts/generate-types.js
+++ b/packages/svelte/scripts/generate-types.js
@@ -29,7 +29,7 @@ await createBundle({
 		[`${pkg.name}/easing`]: `${dir}/src/easing/index.js`,
 		[`${pkg.name}/legacy`]: `${dir}/src/legacy/legacy-client.js`,
 		[`${pkg.name}/motion`]: `${dir}/src/motion/public.d.ts`,
-		[`${pkg.name}/reactivity`]: `${dir}/src/reactivity/index.js`,
+		[`${pkg.name}/reactivity`]: `${dir}/src/reactivity/index-client.js`,
 		[`${pkg.name}/server`]: `${dir}/src/server/index.js`,
 		[`${pkg.name}/store`]: `${dir}/src/store/public.d.ts`,
 		[`${pkg.name}/transition`]: `${dir}/src/transition/public.d.ts`,
diff --git a/packages/svelte/src/reactivity/index.js b/packages/svelte/src/reactivity/index-client.js
similarity index 100%
rename from packages/svelte/src/reactivity/index.js
rename to packages/svelte/src/reactivity/index-client.js
diff --git a/packages/svelte/src/reactivity/index-server.js b/packages/svelte/src/reactivity/index-server.js
new file mode 100644
index 0000000000..1821bac2de
--- /dev/null
+++ b/packages/svelte/src/reactivity/index-server.js
@@ -0,0 +1,3 @@
+export const Date = globalThis.Date;
+export const Set = globalThis.Set;
+export const Map = globalThis.Map;