From 33d118f8a29a376e4490f2d31b0b444bf8fa0c7c Mon Sep 17 00:00:00 2001
From: Paolo Ricciuti <ricciutipaolo@gmail.com>
Date: Fri, 21 Mar 2025 23:47:26 +0100
Subject: [PATCH 1/3] feat: migrate reassigned deriveds to `$derived` (#15581)

---
 .changeset/forty-snakes-lay.md                  |  5 +++++
 packages/svelte/src/compiler/migrate/index.js   | 17 ++++++++++++++++-
 .../samples/reassigned-deriveds/input.svelte    | 10 ++++++++++
 .../samples/reassigned-deriveds/output.svelte   | 10 ++++++++++
 4 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/forty-snakes-lay.md
 create mode 100644 packages/svelte/tests/migrate/samples/reassigned-deriveds/input.svelte
 create mode 100644 packages/svelte/tests/migrate/samples/reassigned-deriveds/output.svelte

diff --git a/.changeset/forty-snakes-lay.md b/.changeset/forty-snakes-lay.md
new file mode 100644
index 000000000000..6cb4c2d76122
--- /dev/null
+++ b/.changeset/forty-snakes-lay.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+feat: migrate reassigned deriveds to `$derived`
diff --git a/packages/svelte/src/compiler/migrate/index.js b/packages/svelte/src/compiler/migrate/index.js
index 7f26d0d0103a..b336ebb2b885 100644
--- a/packages/svelte/src/compiler/migrate/index.js
+++ b/packages/svelte/src/compiler/migrate/index.js
@@ -19,6 +19,7 @@ import { migrate_svelte_ignore } from '../utils/extract_svelte_ignore.js';
 import { validate_component_options } from '../validate-options.js';
 import { is_reserved, is_svg, is_void } from '../../utils.js';
 import { regex_is_valid_identifier } from '../phases/patterns.js';
+import { VERSION } from 'svelte/compiler';
 
 const regex_style_tags = /(<style[^>]+>)([\S\s]*?)(<\/style>)/g;
 const style_placeholder = '/*$$__STYLE_CONTENT__$$*/';
@@ -113,6 +114,16 @@ function find_closing_parenthesis(start, code) {
 	return end;
 }
 
+function check_support_writable_deriveds() {
+	const [major, minor, patch] = VERSION.split('.');
+
+	if (+major < 5) return false;
+	if (+minor < 25) return false;
+	return true;
+}
+
+const support_writable_derived = check_support_writable_deriveds();
+
 /**
  * Does a best-effort migration of Svelte code towards using runes, event attributes and render tags.
  * May throw an error if the code is too complex to migrate automatically.
@@ -952,7 +963,11 @@ const instance_script = {
 			const reassigned_bindings = bindings.filter((b) => b?.reassigned);
 
 			if (
-				reassigned_bindings.length === 0 &&
+				// on version 5.25.0 deriveds are writable so we can use them even if
+				// reassigned (but if the right side is a literal we want to use `$state`)
+				(support_writable_derived
+					? node.body.expression.right.type !== 'Literal'
+					: reassigned_bindings.length === 0) &&
 				!bindings.some((b) => b?.kind === 'store_sub') &&
 				node.body.expression.left.type !== 'MemberExpression'
 			) {
diff --git a/packages/svelte/tests/migrate/samples/reassigned-deriveds/input.svelte b/packages/svelte/tests/migrate/samples/reassigned-deriveds/input.svelte
new file mode 100644
index 000000000000..024f719fb96b
--- /dev/null
+++ b/packages/svelte/tests/migrate/samples/reassigned-deriveds/input.svelte
@@ -0,0 +1,10 @@
+<script>
+	let name = 'world';
+
+	$: upper = name.toUpperCase();
+</script>
+
+<input bind:value={name} />
+<input bind:value={upper} />
+
+{upper}
\ No newline at end of file
diff --git a/packages/svelte/tests/migrate/samples/reassigned-deriveds/output.svelte b/packages/svelte/tests/migrate/samples/reassigned-deriveds/output.svelte
new file mode 100644
index 000000000000..0903299d9599
--- /dev/null
+++ b/packages/svelte/tests/migrate/samples/reassigned-deriveds/output.svelte
@@ -0,0 +1,10 @@
+<script>
+	let name = $state('world');
+
+	let upper = $derived(name.toUpperCase());
+</script>
+
+<input bind:value={name} />
+<input bind:value={upper} />
+
+{upper}
\ No newline at end of file

From 78d238c5a34396afcc9edf02bb767d0936440ad9 Mon Sep 17 00:00:00 2001
From: Paolo Ricciuti <ricciutipaolo@gmail.com>
Date: Sat, 22 Mar 2025 00:03:38 +0100
Subject: [PATCH 2/3] chore: revert version check in migrate (#15583)

---
 packages/svelte/src/compiler/migrate/index.js | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/packages/svelte/src/compiler/migrate/index.js b/packages/svelte/src/compiler/migrate/index.js
index b336ebb2b885..9d79d88b2397 100644
--- a/packages/svelte/src/compiler/migrate/index.js
+++ b/packages/svelte/src/compiler/migrate/index.js
@@ -19,7 +19,6 @@ import { migrate_svelte_ignore } from '../utils/extract_svelte_ignore.js';
 import { validate_component_options } from '../validate-options.js';
 import { is_reserved, is_svg, is_void } from '../../utils.js';
 import { regex_is_valid_identifier } from '../phases/patterns.js';
-import { VERSION } from 'svelte/compiler';
 
 const regex_style_tags = /(<style[^>]+>)([\S\s]*?)(<\/style>)/g;
 const style_placeholder = '/*$$__STYLE_CONTENT__$$*/';
@@ -114,16 +113,6 @@ function find_closing_parenthesis(start, code) {
 	return end;
 }
 
-function check_support_writable_deriveds() {
-	const [major, minor, patch] = VERSION.split('.');
-
-	if (+major < 5) return false;
-	if (+minor < 25) return false;
-	return true;
-}
-
-const support_writable_derived = check_support_writable_deriveds();
-
 /**
  * Does a best-effort migration of Svelte code towards using runes, event attributes and render tags.
  * May throw an error if the code is too complex to migrate automatically.
@@ -963,11 +952,7 @@ const instance_script = {
 			const reassigned_bindings = bindings.filter((b) => b?.reassigned);
 
 			if (
-				// on version 5.25.0 deriveds are writable so we can use them even if
-				// reassigned (but if the right side is a literal we want to use `$state`)
-				(support_writable_derived
-					? node.body.expression.right.type !== 'Literal'
-					: reassigned_bindings.length === 0) &&
+				node.body.expression.right.type !== 'Literal' &&
 				!bindings.some((b) => b?.kind === 'store_sub') &&
 				node.body.expression.left.type !== 'MemberExpression'
 			) {

From 7fe9bf524bbf060a0acf8b91c8ca322b105423b4 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Sat, 22 Mar 2025 00:04:01 +0100
Subject: [PATCH 3/3] Version Packages (#15582)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 .changeset/forty-snakes-lay.md | 5 -----
 packages/svelte/CHANGELOG.md   | 6 ++++++
 packages/svelte/package.json   | 2 +-
 packages/svelte/src/version.js | 2 +-
 4 files changed, 8 insertions(+), 7 deletions(-)
 delete mode 100644 .changeset/forty-snakes-lay.md

diff --git a/.changeset/forty-snakes-lay.md b/.changeset/forty-snakes-lay.md
deleted file mode 100644
index 6cb4c2d76122..000000000000
--- a/.changeset/forty-snakes-lay.md
+++ /dev/null
@@ -1,5 +0,0 @@
----
-'svelte': patch
----
-
-feat: migrate reassigned deriveds to `$derived`
diff --git a/packages/svelte/CHANGELOG.md b/packages/svelte/CHANGELOG.md
index 9e99e91b8e73..86e11790297f 100644
--- a/packages/svelte/CHANGELOG.md
+++ b/packages/svelte/CHANGELOG.md
@@ -1,5 +1,11 @@
 # svelte
 
+## 5.25.2
+
+### Patch Changes
+
+- feat: migrate reassigned deriveds to `$derived` ([#15581](https://github.com/sveltejs/svelte/pull/15581))
+
 ## 5.25.1
 
 ### Patch Changes
diff --git a/packages/svelte/package.json b/packages/svelte/package.json
index 9d3902696d25..56fa949391d7 100644
--- a/packages/svelte/package.json
+++ b/packages/svelte/package.json
@@ -2,7 +2,7 @@
   "name": "svelte",
   "description": "Cybernetically enhanced web apps",
   "license": "MIT",
-  "version": "5.25.1",
+  "version": "5.25.2",
   "type": "module",
   "types": "./types/index.d.ts",
   "engines": {
diff --git a/packages/svelte/src/version.js b/packages/svelte/src/version.js
index a4f5a15c8f7b..e2dc6c2c09a7 100644
--- a/packages/svelte/src/version.js
+++ b/packages/svelte/src/version.js
@@ -4,5 +4,5 @@
  * The current version, as set in package.json.
  * @type {string}
  */
-export const VERSION = '5.25.1';
+export const VERSION = '5.25.2';
 export const PUBLIC_VERSION = '5';

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