Migrate from @typescript-eslint/* packages to typescript-eslint

[karlhorky]

https://typescript-eslint.io/blog/announcing-typescript-eslint-v7/#new-features---flat-config-support

Partial info from blog post above:

With v7 we're releasing a new package, typescript-eslint. This package can be imported within your flat config to access our configs, plugin, and parser. This package also exports a utility function called config which will allow you to write type-checked configuration files!

Switching to typescript-eslint

Because this new package includes dependencies on our plugin and parser, you can replace those dependencies entirely:

pnpm remove @typescript-eslint/parser @typescript-eslint/eslint-plugin
pnpm add typescript-eslint

This also allows for a tseslint.config() helper:

eslint.config.js

import tseslint from 'typescript-eslint';

export default tseslint.config(
  // config here
);

We may also be able to get rid of some other libraries that we have, eg. if we're using tsutils or similar old packages:

• feat(#16): update typescript-eslint dependencies hluisson/eslint-plugin-jsx-expressions#17 (comment)