diff --git a/lib/shiki-helpers.mjs b/lib/shiki-helpers.mjs
deleted file mode 100644
index bd68d01d..00000000
--- a/lib/shiki-helpers.mjs
+++ /dev/null
@@ -1,10 +0,0 @@
-// @ts-check
-
-import { bundledLanguages } from 'shiki'
-import { runAsWorker } from 'synckit'
-
-runAsWorker(async (lang) => {
-  const fn = bundledLanguages[lang]
-  if (!fn) return null
-  return (await fn()).default
-})
diff --git a/package.json b/package.json
index d0b7e10d..a5aa040b 100644
--- a/package.json
+++ b/package.json
@@ -36,9 +36,6 @@
     },
     "./vue-demi": {
       "default": "./lib/vue-demi.mjs"
-    },
-    "./shiki-helpers": {
-      "default": "./lib/shiki-helpers.mjs"
     }
   },
   "main": "dist/node/index.js",
@@ -116,7 +113,6 @@
     "mark.js": "8.11.1",
     "minisearch": "^7.1.0",
     "shiki": "^1.22.2",
-    "synckit": "^0.9.2",
     "vite": "^5.4.10",
     "vue": "^3.5.12"
   },
@@ -189,6 +185,7 @@
     "sirv": "^3.0.0",
     "sitemap": "^8.0.0",
     "supports-color": "^9.4.0",
+    "synckit": "^0.9.2",
     "tinyglobby": "^0.2.10",
     "typescript": "^5.6.3",
     "vitest": "^2.1.4",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d59b6e54..3c7b1692 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -61,9 +61,6 @@ importers:
       shiki:
         specifier: ^1.22.2
         version: 1.22.2
-      synckit:
-        specifier: ^0.9.2
-        version: 0.9.2
       vite:
         specifier: ^5.4.10
         version: 5.4.10(@types/node@22.8.2)
@@ -275,6 +272,9 @@ importers:
       supports-color:
         specifier: ^9.4.0
         version: 9.4.0
+      synckit:
+        specifier: ^0.9.2
+        version: 0.9.2
       tinyglobby:
         specifier: ^0.2.10
         version: 0.2.10
diff --git a/rollup.config.ts b/rollup.config.ts
index f50d4d5f..ed7841b2 100644
--- a/rollup.config.ts
+++ b/rollup.config.ts
@@ -1,7 +1,7 @@
-import { promises as fs } from 'fs'
-import { builtinModules, createRequire } from 'module'
-import { resolve } from 'path'
-import { fileURLToPath } from 'url'
+import * as fs from 'node:fs/promises'
+import { builtinModules, createRequire } from 'node:module'
+import { resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
 import { type RollupOptions, defineConfig } from 'rollup'
 import { nodeResolve } from '@rollup/plugin-node-resolve'
 import commonjs from '@rollup/plugin-commonjs'
@@ -10,6 +10,7 @@ import json from '@rollup/plugin-json'
 import replace from '@rollup/plugin-replace'
 import alias from '@rollup/plugin-alias'
 import dts from 'rollup-plugin-dts'
+import { globSync } from 'tinyglobby'
 
 const ROOT = fileURLToPath(import.meta.url)
 const r = (p: string) => resolve(ROOT, '..', p)
@@ -43,11 +44,15 @@ const plugins = [
 ]
 
 const esmBuild: RollupOptions = {
-  input: [r('src/node/index.ts'), r('src/node/cli.ts')],
+  input: [
+    r('src/node/index.ts'),
+    r('src/node/cli.ts'),
+    ...globSync(r('src/node/worker_*.ts'))
+  ],
   output: {
     format: 'esm',
     entryFileNames: `[name].js`,
-    chunkFileNames: 'serve-[hash].js',
+    chunkFileNames: 'chunk-[hash].js',
     dir: r('dist/node'),
     sourcemap: DEV
   },
diff --git a/src/node/markdown/plugins/highlight.ts b/src/node/markdown/plugins/highlight.ts
index bb2ffd42..4afe83cc 100644
--- a/src/node/markdown/plugins/highlight.ts
+++ b/src/node/markdown/plugins/highlight.ts
@@ -1,7 +1,3 @@
-import { customAlphabet } from 'nanoid'
-import c from 'picocolors'
-import type { ShikiTransformer } from 'shiki'
-import { createHighlighter, isSpecialLang } from 'shiki'
 import {
   transformerCompactLineOptions,
   transformerNotationDiff,
@@ -10,14 +6,21 @@ import {
   transformerNotationHighlight,
   type TransformerCompactLineOption
 } from '@shikijs/transformers'
+import { customAlphabet } from 'nanoid'
+import { createRequire } from 'node:module'
+import c from 'picocolors'
+import type { ShikiTransformer } from 'shiki'
+import { createHighlighter, isSpecialLang } from 'shiki'
+import { createSyncFn } from 'synckit'
 import type { Logger } from 'vite'
+import type { ShikiResolveLang } from 'worker_shikiResolveLang'
 import type { MarkdownOptions, ThemeOptions } from '../markdown'
-import { createSyncFn } from 'synckit'
-import { createRequire } from 'node:module'
 
 const require = createRequire(import.meta.url)
 
-const resolveLang = createSyncFn(require.resolve('vitepress/shiki-helpers'))
+const resolveLangSync = createSyncFn<ShikiResolveLang>(
+  require.resolve('vitepress/dist/node/worker_shikiResolveLang.js')
+)
 const nanoid = customAlphabet('abcdefghijklmnopqrstuvwxyz', 10)
 
 /**
@@ -67,7 +70,10 @@ export async function highlight(
       typeof theme === 'object' && 'light' in theme && 'dark' in theme
         ? [theme.light, theme.dark]
         : [theme],
-    langs: options.languages || [],
+    langs: [
+      ...(options.languages || []),
+      ...Object.values(options.languageAlias || {})
+    ],
     langAlias: options.languageAlias
   })
 
@@ -113,8 +119,8 @@ export async function highlight(
       if (lang) {
         const langLoaded = highlighter.getLoadedLanguages().includes(lang)
         if (!langLoaded && !isSpecialLang(lang)) {
-          const resolvedLang = resolveLang(lang)
-          if (!resolveLang) {
+          const resolvedLang = resolveLangSync(lang)
+          if (!resolvedLang) {
             logger.warn(
               c.yellow(
                 `\nThe language '${lang}' is not loaded, falling back to '${
@@ -124,7 +130,7 @@ export async function highlight(
             )
             lang = defaultLang
           } else {
-            highlighter.loadLanguageSync(resolvedLang as any)
+            highlighter.loadLanguageSync(resolvedLang)
           }
         }
       }
diff --git a/src/node/worker_shikiResolveLang.ts b/src/node/worker_shikiResolveLang.ts
new file mode 100644
index 00000000..524a5ad5
--- /dev/null
+++ b/src/node/worker_shikiResolveLang.ts
@@ -0,0 +1,14 @@
+import { bundledLanguages, type DynamicImportLanguageRegistration } from 'shiki'
+import { runAsWorker } from 'synckit'
+
+async function resolveLang(lang: string) {
+  return (
+    (bundledLanguages as Record<string, DynamicImportLanguageRegistration>)
+      [lang]?.()
+      .then((m) => m.default) || []
+  )
+}
+
+runAsWorker(resolveLang)
+
+export type ShikiResolveLang = typeof resolveLang