diff --git a/scripts/post-build.ts b/scripts/post-build.ts
index c5e655af0..f62e9292f 100644
--- a/scripts/post-build.ts
+++ b/scripts/post-build.ts
@@ -14,20 +14,18 @@ import { execSync } from 'node:child_process'
 const outdir = 'dist'
 
 async function postBuild() {
-  // Step 1: Patch globalThis.Bun destructuring from third-party deps
-  const files = await readdir(outdir, { recursive: true })
+  // Step 1: Patch globalThis.Bun destructuring in the single bundled file
+  const cliPath = join(outdir, 'cli.js')
   const BUN_DESTRUCTURE = /var \{([^}]+)\} = globalThis\.Bun;?/g
   const BUN_DESTRUCTURE_SAFE =
     'var {$1} = typeof globalThis.Bun !== "undefined" ? globalThis.Bun : {};'
 
   let bunPatched = 0
-  for (const file of files) {
-    const filePath = join(outdir, file)
-    if (typeof file !== 'string' || !file.endsWith('.js')) continue
-    const content = await readFile(filePath, 'utf-8')
+  {
+    const content = await readFile(cliPath, 'utf-8')
     if (BUN_DESTRUCTURE.test(content)) {
       await writeFile(
-        filePath,
+        cliPath,
         content.replace(BUN_DESTRUCTURE, BUN_DESTRUCTURE_SAFE),
       )
       bunPatched++
diff --git a/src/services/doubaoSTT.ts b/src/services/doubaoSTT.ts
index 86c8e5117..0cd1e5024 100644
--- a/src/services/doubaoSTT.ts
+++ b/src/services/doubaoSTT.ts
@@ -110,12 +110,15 @@ export async function connectDoubaoStream(
   let doubaoAsr: typeof import('doubaoime-asr')
   try {
     doubaoAsr = await import('doubaoime-asr')
-  } catch {
-    logError(new Error('[doubao-asr] Failed to import doubaoime-asr package'))
-    callbacks.onError(
-      'doubaoime-asr package is not installed. Install it with: bun add doubaoime-asr',
-      { fatal: true },
+  } catch (err) {
+    logError(
+      new Error(
+        `[doubao-asr] Failed to import doubaoime-asr package: ${String(err)}`,
+      ),
     )
+    callbacks.onError(`doubaoime-asr package import failed: ${String(err)}`, {
+      fatal: true,
+    })
     return null
   }
 
diff --git a/vite.config.ts b/vite.config.ts
index ea09e7b0a..115b2e42a 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -70,6 +70,11 @@ export default defineConfig({
   ssr: {
     target: 'node',
     noExternal: true,
+    // Packages with runtime require.resolve() or WASM binaries can't be
+    // inlined into the bundle — they must be resolved from node_modules
+    // at runtime.  doubaoime-asr uses opus-encdec which does
+    // require.resolve('opus-encdec/dist/libopus-encoder.wasm.js').
+    external: ['doubaoime-asr', 'opus-encdec'],
   },
 
   build: {
@@ -88,9 +93,9 @@ export default defineConfig({
 
       output: {
         format: 'es',
-        dir: 'dist',
+        // Single-file build: no code splitting, all dynamic imports inlined
+        codeSplitting: false,
         entryFileNames: 'cli.js',
-        chunkFileNames: 'chunks/[name]-[hash].js',
       },
 
       plugins: [