diff --git a/packages/svelte/package.json b/packages/svelte/package.json
index f077729cda..8932e2e07a 100644
--- a/packages/svelte/package.json
+++ b/packages/svelte/package.json
@@ -131,7 +131,7 @@
     "tiny-glob": "^0.2.9"
   },
   "dependencies": {
-    "@ampproject/remapping": "^2.3.0",
+    "@ampproject/remapping": "2.2.1",
     "@jridgewell/sourcemap-codec": "^1.5.0",
     "@types/estree": "^1.0.5",
     "acorn": "^8.12.1",
@@ -142,7 +142,7 @@
     "esrap": "^1.2.2",
     "is-reference": "^3.0.2",
     "locate-character": "^3.0.0",
-    "magic-string": "^0.30.11",
+    "magic-string": "0.30.5",
     "zimmerframe": "^1.1.2"
   },
   "knip": {
diff --git a/packages/svelte/src/compiler/legacy.js b/packages/svelte/src/compiler/legacy.js
index 9d4050eb62..2e50fb9e4b 100644
--- a/packages/svelte/src/compiler/legacy.js
+++ b/packages/svelte/src/compiler/legacy.js
@@ -354,8 +354,8 @@ export function convert(source, ast) {
 				}
 
 				const start = node.elseif
-					? node.consequent.nodes[0]?.start ??
-						source.lastIndexOf('{', /** @type {number} */ (node.end) - 1)
+					? (node.consequent.nodes[0]?.start ??
+						source.lastIndexOf('{', /** @type {number} */ (node.end) - 1))
 					: node.start;
 
 				remove_surrounding_whitespace_nodes(node.consequent.nodes);
diff --git a/packages/svelte/src/compiler/utils/builders.js b/packages/svelte/src/compiler/utils/builders.js
index b31ff0c3a8..10f2b7a3ea 100644
--- a/packages/svelte/src/compiler/utils/builders.js
+++ b/packages/svelte/src/compiler/utils/builders.js
@@ -352,7 +352,7 @@ export function prop(kind, key, value, computed = false) {
  * @returns {ESTree.PropertyDefinition}
  */
 export function prop_def(key, value, computed = false, is_static = false) {
-	return { type: 'PropertyDefinition', key, value, computed, static: is_static };
+	return { type: 'PropertyDefinition', key, value, computed, static: is_static, decorators: [] };
 }
 
 /**
@@ -541,7 +541,8 @@ export function method(kind, key, params, body, computed = false, is_static = fa
 		kind,
 		value: function_builder(null, params, block(body)),
 		computed,
-		static: is_static
+		static: is_static,
+		decorators: []
 	};
 }
 
diff --git a/packages/svelte/src/internal/client/dom/css.js b/packages/svelte/src/internal/client/dom/css.js
index dbf862543f..b4db8fe478 100644
--- a/packages/svelte/src/internal/client/dom/css.js
+++ b/packages/svelte/src/internal/client/dom/css.js
@@ -21,7 +21,8 @@ export function append_styles(anchor, css, is_custom_element = false) {
 
 		var target = /** @type {ShadowRoot} */ (root).host
 			? /** @type {ShadowRoot} */ (root)
-			: /** @type {Document} */ (root).head ?? /** @type {Document} */ (root.ownerDocument).head;
+			: // prettier-ignore
+				/** @type {Document} */ (root).head ?? /** @type {Document} */ (root.ownerDocument).head;
 
 		if (!target.querySelector('#' + css.hash)) {
 			const style = document.createElement('style');
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1803be83e0..44e80bcaea 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -63,8 +63,8 @@ importers:
   packages/svelte:
     dependencies:
       '@ampproject/remapping':
-        specifier: ^2.3.0
-        version: 2.3.0
+        specifier: 2.2.1
+        version: 2.2.1
       '@jridgewell/sourcemap-codec':
         specifier: ^1.5.0
         version: 1.5.0
@@ -96,8 +96,8 @@ importers:
         specifier: ^3.0.0
         version: 3.0.0
       magic-string:
-        specifier: ^0.30.11
-        version: 0.30.11
+        specifier: 0.30.5
+        version: 0.30.5
       zimmerframe:
         specifier: ^1.1.2
         version: 1.1.2
@@ -410,6 +410,10 @@ importers:
 
 packages:
 
+  '@ampproject/remapping@2.2.1':
+    resolution: {integrity: sha512-lFMjJTrFL3j7L9yBxwYfCq2k6qqwHyzuUl/XBnif78PWTJYyL/dfowQHWE3sp6U6ZzqWiiIZnpTMO96zhkjwtg==}
+    engines: {node: '>=6.0.0'}
+
   '@ampproject/remapping@2.3.0':
     resolution: {integrity: sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw==}
     engines: {node: '>=6.0.0'}
@@ -2886,6 +2890,10 @@ packages:
   magic-string@0.30.11:
     resolution: {integrity: sha512-+Wri9p0QHMy+545hKww7YAu5NyzF8iomPL/RQazugQ9+Ez4Ic3mERMd8ZTX5rfK944j+560ZJi8iAwgak1Ac7A==}
 
+  magic-string@0.30.5:
+    resolution: {integrity: sha512-7xlpfBaQaP/T6Vh8MO/EqXSW5En6INHEvEXQiuff7Gku0PWjU3uf6w/j9o7O+SpB5fOAkrI5HeoNgwjEO0pFsA==}
+    engines: {node: '>=12'}
+
   magicast@0.3.4:
     resolution: {integrity: sha512-TyDF/Pn36bBji9rWKHlZe+PZb6Mx5V8IHCSxk7X4aljM4e/vyDvZZYwHewdVaqiA0nb3ghfHU/6AUpDxWoER2Q==}
 
@@ -4119,6 +4127,11 @@ packages:
 
 snapshots:
 
+  '@ampproject/remapping@2.2.1':
+    dependencies:
+      '@jridgewell/gen-mapping': 0.3.5
+      '@jridgewell/trace-mapping': 0.3.25
+
   '@ampproject/remapping@2.3.0':
     dependencies:
       '@jridgewell/gen-mapping': 0.3.5
@@ -6824,6 +6837,10 @@ snapshots:
     dependencies:
       '@jridgewell/sourcemap-codec': 1.5.0
 
+  magic-string@0.30.5:
+    dependencies:
+      '@jridgewell/sourcemap-codec': 1.5.0
+
   magicast@0.3.4:
     dependencies:
       '@babel/parser': 7.25.3
@@ -7625,7 +7642,7 @@ snapshots:
 
   svelte@4.2.18:
     dependencies:
-      '@ampproject/remapping': 2.3.0
+      '@ampproject/remapping': 2.2.1
       '@jridgewell/sourcemap-codec': 1.5.0
       '@jridgewell/trace-mapping': 0.3.25
       '@types/estree': 1.0.5