refactor(core): do not empty temp directory

Author: meteorlxy

packages/@vuepress/core/src/app/createAppWriteTemp.ts

@@ -5,14 +5,6 @@ import type { App, AppWriteTemp } from '../types'
  * Create write temp file util for vuepress app
  */
 export const createAppWriteTemp = async (app: App): Promise<AppWriteTemp> => {
-  const dirTemp = app.dir.temp()
-
-  // TODO: add flag to control empty temp directory or not
-  // TODO: check if temp dir is safe to empty
-  // empty temp directory
-  await fs.emptyDir(dirTemp)
-
-  // TODO: temp cache from files
   const tempCache = new Map<string, string>()
 
   const writeTemp: AppWriteTemp = async (file: string, content: string) => {