feat(eslint): add flat configs

[appano1]

Resolves #73
Resolves #108

Related to #113

The goal of this PR is to ensure that developers meet no breaking changes.
Developers can apply the flat config as follows.

import vercel from '@vercel/style-guide/eslint/flat'
export default [
  ...vercel.configs.recommended,
  ...vercel.configs.typescript,
  ...vercel.configs.react,
  ...vercel.configs.next,
]

Due to certain characteristics of the flat config, it is not fully identical to the legacy config. @vercel/style-guide/eslint/browser and @vercel/style-guide/eslint/node might not be needed since developers can register them through the globals package. Instead, developers can continue to use the existing _base.js by applying configs.recommended.

import vercel from '@vercel/style-guide/eslint/flat'
export default [
  ...vercel.configs.recommended,
  {
    languageOptions: {
      globals: {
        ...globals.browser,
        ...globals.node,
      },
    },
  },
]

For @vercel/style-guide/eslint/jest, I’ve added jest-typescript.js to increase flexibility, as users may need to configure it within the flat config using options.files.

import vercel from '@vercel/style-guide/eslint/flat'
export default [
  { files: [/*path*/], ...vercel.configs.jest },
  vercel.configs['jest-typescript'],
]

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@eslint-community/[email protected]	None	+2	98.3 kB	eslint-community-bot
npm/@eslint/[email protected]	None	0	14.6 kB	eslintbot
npm/@types/[email protected]	None	+3	256 kB	types
npm/@types/[email protected]	None	+1	2.36 MB	types
npm/@typescript-eslint/[email protected]	Transitive: environment, filesystem	+37	8.54 MB	bradzacher, jameshenry
npm/@typescript-eslint/[email protected]	Transitive: environment, filesystem	+30	3.73 MB	bradzacher, jameshenry
npm/@vitest/[email protected]	Transitive: environment, filesystem	+32	4.81 MB	veritemm
npm/[email protected]	Transitive: environment, eval, filesystem, unsafe	+102	8.45 MB	benmosher, jfmengels, ljharb
npm/[email protected]	filesystem Transitive: environment	+32	4.73 MB	simenb
npm/[email protected]	Transitive: eval	+91	12 MB	evcohen, jessebeach, lencioni, ...1 more
npm/[email protected]	None	+2	307 kB	mxschmitt
npm/[email protected]	None	0	0 B
npm/[email protected]	Transitive: environment, eval, filesystem	+113	8.48 MB	ljharb, yannickcr
npm/[email protected]	Transitive: environment, filesystem	+44	3.97 MB	testing-library-bot
npm/[email protected]	Transitive: environment, eval, filesystem, unsafe	+15	4.74 MB	odspnpm
npm/[email protected]	Transitive: environment, filesystem, shell, unsafe	+67	6.82 MB	sindresorhus
npm/[email protected]	environment Transitive: eval, filesystem, shell, unsafe	+84	10.4 MB	eslintbot
npm/[email protected]	None	0	176 kB	sindresorhus
npm/[email protected]	environment, filesystem, unsafe	0	7.7 MB	prettier-bot
npm/[email protected]	Transitive: environment, filesystem	+32	4.48 MB	jameshenry

🚮 Removed packages: npm/@typescript-eslint/[email protected], npm/@typescript-eslint/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected]

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[appano1]

I added a comments config and a unicorn config to ensure that only pure rules, excluding plugins, are in the rules directory.

[appano1]

I replaced eslint-comment to @eslint-community/eslint-comments cause eslint-comment is not maintained for a while

[idkgene]

You have a typo here. import instead of improt