diff --git a/src/node/markdown/markdown.ts b/src/node/markdown/markdown.ts
index 378b54c1..c7b74d9e 100644
--- a/src/node/markdown/markdown.ts
+++ b/src/node/markdown/markdown.ts
@@ -24,7 +24,7 @@ import MarkdownIt from 'markdown-it'
 import anchorPlugin from 'markdown-it-anchor'
 import attrsPlugin from 'markdown-it-attrs'
 import { full as emojiPlugin } from 'markdown-it-emoji'
-import type { BuiltinTheme, Highlighter } from 'shiki'
+import type { BuiltinLanguage, BuiltinTheme, Highlighter } from 'shiki'
 import type { Logger } from 'vite'
 import { containerPlugin, type ContainerOptions } from './plugins/containers'
 import { gitHubAlertsPlugin } from './plugins/githubAlerts'
@@ -53,11 +53,11 @@ export interface MarkdownOptions extends Options {
   /**
    * Setup markdown-it instance before applying plugins
    */
-  preConfig?: (md: MarkdownIt) => void
+  preConfig?: (md: MarkdownIt) => Awaited<void>
   /**
    * Setup markdown-it instance
    */
-  config?: (md: MarkdownIt) => void
+  config?: (md: MarkdownIt) => Awaited<void>
   /**
    * Disable cache (experimental)
    */
@@ -81,10 +81,10 @@ export interface MarkdownOptions extends Options {
    */
   theme?: ThemeOptions
   /**
-   * Languages for syntax highlighting.
+   * Custom languages for syntax highlighting or pre-load built-in languages.
    * @see https://shiki.style/languages
    */
-  languages?: LanguageInput[]
+  languages?: (LanguageInput | BuiltinLanguage)[]
   /**
    * Custom language aliases.
    *
@@ -229,7 +229,7 @@ export async function createMarkdownRenderer(
   md.use(restoreEntities)
 
   if (options.preConfig) {
-    options.preConfig(md)
+    await options.preConfig(md)
   }
 
   // custom plugins
@@ -322,7 +322,7 @@ export async function createMarkdownRenderer(
 
   // apply user config
   if (options.config) {
-    options.config(md)
+    await options.config(md)
   }
 
   return md