@armano2 knows the most - but the TLDR is that you only need/want the Linterclass - which is designed to solely operate on strings and takes object definitions for rules and parsers.

You can tree shake everything else from the package after that.

The harder part is making TS web safe and integrating that into our tooling - which required some fiddling iirc

making eslint work in browser is actually not that hard, as making ts-eslint work, this package is intentionally private as this is a "hack" build to work with monaco,

I will try to prepare some documentation for it after I finish "splitting" #6656, but this is low prio for me (at least for now)

this package on main is kinda a mess and i simplified it in v6
https://github.com/typescript-eslint/typescript-eslint/blob/v6/packages/website-eslint/build.ts

if you want to just load eslint for web without typescript you can look at what @mysticatea and @ota-meshi did in

• https://github.com/mysticatea/vue-eslint-demo
• https://github.com/mysticatea/eslint4b (no longer maintained)
• https://github.com/ota-meshi/eslint-plugin-vue-demo
• https://github.com/ota-meshi/site-kit

Our initial versions of playground where inspired by great job done by mysticatea for vue playground

sorry for pinging