diff --git a/.changeset/loose-crabs-sink.md b/.changeset/loose-crabs-sink.md
new file mode 100644
index 00000000..a2f084e1
--- /dev/null
+++ b/.changeset/loose-crabs-sink.md
@@ -0,0 +1,5 @@
+---
+'sv': patch
+---
+
+fix: handle `satisfies` keyword for `vite.addPlugin`
diff --git a/packages/core/tests/js/vite/with-satisfies/input.ts b/packages/core/tests/js/vite/with-satisfies/input.ts
new file mode 100644
index 00000000..7a13e19c
--- /dev/null
+++ b/packages/core/tests/js/vite/with-satisfies/input.ts
@@ -0,0 +1,46 @@
+import { sveltekit } from '@sveltejs/kit/vite';
+import examples from 'mdsvexamples/vite';
+import path from 'node:path';
+import { kitRoutes } from 'vite-plugin-kit-routes';
+import tailwindcss from '@tailwindcss/vite';
+import { browserslistToTargets } from 'lightningcss';
+import browserslist from 'browserslist';
+import { defineConfig, type UserConfig } from 'vite';
+
+const $root = path.resolve(__dirname, './src');
+const $lib = path.resolve($root, './lib');
+const $routes = path.resolve($root, './routes');
+const $scripts = path.resolve($lib, './scripts');
+const $actions = path.resolve($lib, './actions');
+
+const config = defineConfig({
+	plugins: [
+		// all plugins
+		examples,
+		tailwindcss(),
+		sveltekit(),
+		kitRoutes()
+	],
+	resolve: {
+		alias: {
+			$lib,
+			$routes,
+			$scripts,
+			$actions
+		}
+	},
+	build: {
+		sourcemap: true,
+		target: 'esnext',
+		cssMinify: 'lightningcss'
+	},
+	css: {
+		transformer: 'lightningcss',
+		lightningcss: {
+			targets: browserslistToTargets(browserslist('defaults, not ie 11'))
+		}
+	},
+	experimental: { enableNativePlugin: true }
+}) satisfies UserConfig;
+
+export default config;
diff --git a/packages/core/tests/js/vite/with-satisfies/output.ts b/packages/core/tests/js/vite/with-satisfies/output.ts
new file mode 100644
index 00000000..4d6ed36e
--- /dev/null
+++ b/packages/core/tests/js/vite/with-satisfies/output.ts
@@ -0,0 +1,41 @@
+import myPlugin from 'my-plugin';
+import { sveltekit } from '@sveltejs/kit/vite';
+import examples from 'mdsvexamples/vite';
+import path from 'node:path';
+import { kitRoutes } from 'vite-plugin-kit-routes';
+import tailwindcss from '@tailwindcss/vite';
+import { browserslistToTargets } from 'lightningcss';
+import browserslist from 'browserslist';
+import { defineConfig, type UserConfig } from 'vite';
+
+const $root = path.resolve(__dirname, './src');
+const $lib = path.resolve($root, './lib');
+const $routes = path.resolve($root, './routes');
+const $scripts = path.resolve($lib, './scripts');
+const $actions = path.resolve($lib, './actions');
+
+const config = defineConfig({
+	plugins: [
+		// all plugins
+		examples,
+		tailwindcss(),
+		sveltekit(),
+		kitRoutes(),
+		myPlugin()
+	],
+	resolve: { alias: { $lib, $routes, $scripts, $actions } },
+	build: {
+		sourcemap: true,
+		target: 'esnext',
+		cssMinify: 'lightningcss'
+	},
+	css: {
+		transformer: 'lightningcss',
+		lightningcss: {
+			targets: browserslistToTargets(browserslist('defaults, not ie 11'))
+		}
+	},
+	experimental: { enableNativePlugin: true }
+}) satisfies UserConfig;
+
+export default config;
diff --git a/packages/core/tests/js/vite/with-satisfies/run.ts b/packages/core/tests/js/vite/with-satisfies/run.ts
new file mode 100644
index 00000000..174c7dba
--- /dev/null
+++ b/packages/core/tests/js/vite/with-satisfies/run.ts
@@ -0,0 +1,7 @@
+import { imports, vite, type AstTypes } from '@sveltejs/cli-core/js';
+
+export function run(ast: AstTypes.Program): void {
+	const vitePluginName = 'myPlugin';
+	imports.addDefault(ast, { as: vitePluginName, from: 'my-plugin' });
+	vite.addPlugin(ast, { code: `${vitePluginName}()` });
+}
diff --git a/packages/core/tooling/js/vite.ts b/packages/core/tooling/js/vite.ts
index 0654fd1d..599e8d5e 100644
--- a/packages/core/tooling/js/vite.ts
+++ b/packages/core/tooling/js/vite.ts
@@ -17,7 +17,10 @@ function exportDefaultConfig(
 		fallbackExpression = object.create({});
 	}
 
-	const { value: rootObject } = exports.createDefault(ast, { fallback: fallbackExpression });
+	const { value } = exports.createDefault(ast, { fallback: fallbackExpression });
+
+	// Handle TypeScript `satisfies` expressions
+	const rootObject = value.type === 'TSSatisfiesExpression' ? value.expression : value;
 
 	// Handle wrapper functions (e.g., defineConfig({})) if ignoreWrapper is specified
 	let configObject: AstTypes.ObjectExpression;