chore: remove unused constant (#2465)

Author: SoonIter

packages/shared/src/index.ts

@@ -8,7 +8,6 @@ export {
   addLeadingSlash,
   addTrailingSlash,
   cleanUrl,
-  DEFAULT_HIGHLIGHT_LANGUAGES,
   HASH_REGEXP,
   inBrowser,
   isDataUrl,

packages/shared/src/runtime-utils/utils.ts

@@ -5,15 +5,6 @@ export const APPEARANCE_KEY = 'rspress-theme-appearance';
 export const SEARCH_INDEX_NAME = 'search_index';
 export const RSPRESS_TEMP_DIR = '.rspress';
 
-export const DEFAULT_HIGHLIGHT_LANGUAGES = [
-  ['js', 'javascript'],
-  ['ts', 'typescript'],
-  ['jsx', 'tsx'],
-  ['xml', 'xml-doc'],
-  ['md', 'markdown'],
-  ['mdx', 'tsx'],
-];
-
 // TODO: these utils should be divided into node and runtime
 export const isProduction = () => process.env.NODE_ENV === 'production';