This frontend is written by js without use any frontend frame.
Don't have to worry about package.json and package-lock.json, they are for linter only, see Code Lint.
Because morden browsers won't let file directly read models,
you still need support to run it by using some libraries:
Run by npm serve:
npx serve --cors
OR
npm install serve
serve --cors
And access ports relatively
Please do code lint first before you push!
If you want to run code lint, you can run
npm install
npm run lint