fix(rehype): support special languages (#808)

Author: fuma-nama

packages/rehype/src/core.ts

@@ -6,6 +6,7 @@ import type { Root } from 'hast'
 import type { Transformer } from 'unified'
 import type { RehypeShikiHandler } from './handlers'
 import type { RehypeShikiCoreOptions } from './types'
+import { isSpecialLang } from 'shiki/core'
 import { visit } from 'unist-util-visit'
 import { InlineCodeHandlers, PreHandler } from './handlers'
 
@@ -92,7 +93,7 @@ function rehypeShikiFromHighlighter(
       if (!lang)
         return defaultLanguage
 
-      if (highlighter.getLoadedLanguages().includes(lang))
+      if (highlighter.getLoadedLanguages().includes(lang) || isSpecialLang(lang))
         return lang
 
       if (lazy) {