diff --git a/package.json b/package.json
index 893a38bf1..087762c1d 100644
--- a/package.json
+++ b/package.json
@@ -162,6 +162,7 @@
     "muggle-string": "^0.4.1",
     "pathe": "^2.0.3",
     "picomatch": "^4.0.3",
+    "rolldown-string": "^0.2.1",
     "scule": "^1.3.0",
     "tinyglobby": "^0.2.15",
     "unplugin": "^2.3.11",
@@ -206,7 +207,7 @@
     "rollup": "^4.53.3",
     "semver": "^7.7.3",
     "ts-expect": "^1.3.0",
-    "tsdown": "0.17.4",
+    "tsdown": "0.18.0",
     "typescript": "^5.9.3",
     "unplugin-auto-import": "^20.3.0",
     "unplugin-vue-markdown": "^29.2.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 713d4c304..e7786b77d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -47,6 +47,9 @@ importers:
       picomatch:
         specifier: ^4.0.3
         version: 4.0.3
+      rolldown-string:
+        specifier: ^0.2.1
+        version: 0.2.1
       scule:
         specifier: ^1.3.0
         version: 1.3.0
@@ -145,8 +148,8 @@ importers:
         specifier: ^1.3.0
         version: 1.3.0
       tsdown:
-        specifier: 0.17.4
-        version: 0.17.4(typescript@5.9.3)(vue-tsc@3.1.8(typescript@5.9.3))
+        specifier: 0.18.0
+        version: 0.18.0(typescript@5.9.3)(vue-tsc@3.1.8(typescript@5.9.3))
       typescript:
         specifier: ^5.9.3
         version: 5.9.3
@@ -5466,6 +5469,10 @@ packages:
       vue-tsc:
         optional: true
 
+  rolldown-string@0.2.1:
+    resolution: {integrity: sha512-7H8oH5A8+L96pbBTPCt/rZrwayEhZY5/ejhdk9nRODH32H1v7+bfkaCr+kS15DcGQ7VC1HcWdQVNABFYgrMOzg==}
+    engines: {node: '>=20.19.0'}
+
   rolldown@1.0.0-beta.10-commit.87188ed:
     resolution: {integrity: sha512-D+iim+DHIwK9kbZvubENmtnYFqHfFV0OKwzT8yU/W+xyUK1A71+iRFmJYBGqNUo3fJ2Ob4oIQfan63mhzh614A==}
     hasBin: true
@@ -5914,8 +5921,8 @@ packages:
   ts-expect@1.3.0:
     resolution: {integrity: sha512-e4g0EJtAjk64xgnFPD6kTBUtpnMVzDrMb12N1YZV0VvSlhnVT3SGxiYTLdGy8Q5cYHOIC/FAHmZ10eGrAguicQ==}
 
-  tsdown@0.17.4:
-    resolution: {integrity: sha512-z+kNuv1rwM1POQIufDUVrdNc/uGy0ueRVafCyDH39IdHxin4JXgB8DNGSPoqdIpcOpqUoRbNreK8NxENFmlhKw==}
+  tsdown@0.18.0:
+    resolution: {integrity: sha512-Yotdh3NzizysnqR96xfpHFYtEntk1cZvSRHz8A+Pn3ZHNdTQa4fBQxh6HHzWZwfjdQv47xb7GCv6vEWMtxBirw==}
     engines: {node: '>=20.19.0'}
     hasBin: true
     peerDependencies:
@@ -12420,6 +12427,10 @@ snapshots:
     transitivePeerDependencies:
       - oxc-resolver
 
+  rolldown-string@0.2.1:
+    dependencies:
+      magic-string: 0.30.21
+
   rolldown@1.0.0-beta.10-commit.87188ed:
     dependencies:
       '@oxc-project/runtime': 0.72.1
@@ -12954,7 +12965,7 @@ snapshots:
 
   ts-expect@1.3.0: {}
 
-  tsdown@0.17.4(typescript@5.9.3)(vue-tsc@3.1.8(typescript@5.9.3)):
+  tsdown@0.18.0(typescript@5.9.3)(vue-tsc@3.1.8(typescript@5.9.3)):
     dependencies:
       ansis: 4.2.0
       cac: 6.7.14
diff --git a/src/data-loaders/auto-exports.ts b/src/data-loaders/auto-exports.ts
index 2462e3b3b..2674c93b2 100644
--- a/src/data-loaders/auto-exports.ts
+++ b/src/data-loaders/auto-exports.ts
@@ -1,6 +1,6 @@
 import { createFilter } from 'unplugin-utils'
 import type { Plugin } from 'vite'
-import MagicString from 'magic-string'
+import { withMagicString } from 'rolldown-string'
 import { findStaticImports, parseStaticImport } from 'mlly'
 import { resolve } from 'pathe'
 import { StringFilter, type UnpluginOptions } from 'unplugin'
@@ -79,21 +79,15 @@ export function AutoExportLoaders({
         id: transformFilter,
       },
 
-      handler(code) {
+      handler: withMagicString((s) => {
+        const code = s.toString()
         const loadersToExports = extractLoadersToExport(code, filterPaths, root)
-
         if (loadersToExports.length <= 0) return
 
-        const s = new MagicString(code)
         s.append(
           `\nexport const __loaders = [\n${loadersToExports.join(',\n')}\n];\n`
         )
-
-        return {
-          code: s.toString(),
-          map: s.generateMap(),
-        }
-      },
+      }),
     },
   }
 }
diff --git a/tsdown.config.ts b/tsdown.config.ts
index 4a8c116d4..c38608ce1 100644
--- a/tsdown.config.ts
+++ b/tsdown.config.ts
@@ -1,4 +1,4 @@
-import { defineConfig, type Options } from 'tsdown'
+import { defineConfig, type UserConfig } from 'tsdown'
 
 export const commonOptions = {
   format: ['cjs', 'esm'],
@@ -10,7 +10,7 @@ export const commonOptions = {
     '@pinia/colada',
     'pinia',
   ],
-} satisfies Options
+} satisfies UserConfig
 
 export default defineConfig([
   {