diff --git a/plugins/plugin-fonts/tsdown.config.ts b/plugins/plugin-fonts/tsdown.config.ts
index ee8efb47..093c0094 100644
--- a/plugins/plugin-fonts/tsdown.config.ts
+++ b/plugins/plugin-fonts/tsdown.config.ts
@@ -1,6 +1,6 @@
-import type { Options } from 'tsdown'
+import type { Options, UserConfigFn } from 'tsdown'
 import { defineConfig } from 'tsdown'
-import { argv } from '../../scripts/tsup-args.js'
+import { argv } from '../../scripts/tsup-args'
 
 const clientExternal: (string | RegExp)[] = [
   /.*\.vue$/,
@@ -37,4 +37,4 @@ export default defineConfig(() => {
     ])
   }
   return options
-}) as Options[]
+}) as UserConfigFn
diff --git a/plugins/plugin-md-power/tsdown.config.ts b/plugins/plugin-md-power/tsdown.config.ts
index dd6fcaba..1be68687 100644
--- a/plugins/plugin-md-power/tsdown.config.ts
+++ b/plugins/plugin-md-power/tsdown.config.ts
@@ -1,6 +1,6 @@
-import type { Options } from 'tsdown'
+import type { Options, UserConfigFn } from 'tsdown'
 import { defineConfig } from 'tsdown'
-import { argv } from '../../scripts/tsup-args.js'
+import { argv } from '../../scripts/tsup-args'
 
 const config = [
   { dir: 'composables', files: ['codeRepl.ts', 'pdf.ts', 'rustRepl.ts', 'size.ts', 'audio.ts', 'demo.ts'] },
@@ -51,4 +51,4 @@ export default defineConfig((cli) => {
     }) as Options))
   }
   return options
-}) as Options[]
+}) as UserConfigFn
diff --git a/plugins/plugin-search/tsdown.config.ts b/plugins/plugin-search/tsdown.config.ts
index d2e20aad..bcaffa74 100644
--- a/plugins/plugin-search/tsdown.config.ts
+++ b/plugins/plugin-search/tsdown.config.ts
@@ -1,6 +1,6 @@
-import type { Options } from 'tsdown'
+import type { Options, UserConfigFn } from 'tsdown'
 import { defineConfig } from 'tsdown'
-import { argv } from '../../scripts/tsup-args.js'
+import { argv } from '../../scripts/tsup-args'
 
 const sharedExternal: (string | RegExp)[] = [
   /.*\/shared\/index\.js$/,
@@ -77,4 +77,4 @@ export default defineConfig(() => {
   }
 
   return options
-}) as Options[]
+}) as UserConfigFn
diff --git a/theme/tsdown.config.ts b/theme/tsdown.config.ts
index 2999d862..4862e1c3 100644
--- a/theme/tsdown.config.ts
+++ b/theme/tsdown.config.ts
@@ -1,9 +1,9 @@
-import type { Options } from 'tsdown'
+import type { Options, UserConfigFn } from 'tsdown'
 import fs from 'node:fs'
 import path from 'node:path'
 import process from 'node:process'
 import { defineConfig } from 'tsdown'
-import { argv } from '../scripts/tsup-args.js'
+import { argv } from '../scripts/tsup-args'
 
 const sharedExternal: (string | RegExp)[] = [
   /.*\/shared\/index\.js$/,
@@ -113,4 +113,4 @@ export default defineConfig((cli) => {
     ] as Options[])
   }
   return options
-}) as Options[]
+}) as UserConfigFn