From the github issue:

> Runtime agnostic. ESLint should be able to run in any runtime, whether Node.js, Deno, the browser, or other. Runtime agnostic. ESLint should be able to run in any runtime, whether Node.js, Deno, the browser, or other. […]

One of the stated goals of this rewrite is to support running in the browser.

Yeah, you're right, it doesn't quite apply here. But I think the general idea applies. JavaScript is supported, used and known by more developers than TypeScript, no matter if it's in the browser or not.