`npm run dev` "package.json invalid path" error caused by `@builder.io/dev-tools` about builder HOT 3 OPEN

// add .replaceAll("/", "\\") to t.config.root
async configureServer(t){let n=await $({getRootDir:()=>t.config.root.replaceAll("/", "\\")})

// import join from path at beginning of file
import { join } from 'path';
//... rest of file
// search for and edit -> configureServer(t)
async configureServer(t){let n=await $({getRootDir:()=>join(t.config.root)})
//... rest of file