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