infra: use eslint.config.ts

[Shinigami92]

This PR switched to eslint.config.ts so we can benefit from TypeScript checks and don't need to rely anymore on a // @ts-check comment at the top of the file

Also it serves as a one-of-the-first examples in big Open Source adopting it and ensure stability for eslint/eslint#18134

• feat: Add support for TS config files eslint/eslint#18134

---

Right now we CANT merge this, because VSCode extension is not possible to pick-up the new eslint.config.ts file

• Support TS config files microsoft/vscode-eslint#1917

Also the feature should be stable and not require a flag

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (15fd536) to head (1dd9db3).
Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff            @@
##             next    #3044    +/-   ##
========================================
  Coverage   99.97%   99.97%            
========================================
  Files        2776     2776            
  Lines      226262   226262            
  Branches      942      591   -351     
========================================
+ Hits       226199   226204     +5     
+ Misses         63       58     -5     

see 1 file with indirect coverage changes

[Shinigami92]

Somehow there is a problem with the deprecation plugin (again) 👀
This is a bit confusing, as I thought that jiti will only strip types and don't try to process the code. But maybe I mixed that up with the new Node v22.6 feature 🤔

https://github.com/faker-js/faker/actions/runs/10329602297/job/28597594550?pr=3044#step:6:16

> @faker-js/faker@9.0.0-rc.0 lint /home/runner/work/faker/faker
> eslint --cache --cache-strategy content --flag unstable_ts_config .


Oops! Something went wrong! :(

ESLint: 9.9.0

TypeError: Cannot read properties of undefined (reading 'rules')
    at fixupPluginRules (/home/runner/work/faker/faker/node_modules/.pnpm/@eslint+compat@1.1.1/node_modules/@eslint/compat/dist/cjs/index.cjs:214:44)
    at /home/runner/work/faker/faker/eslint.config.ts:137:36
    at evalModule (/home/runner/work/faker/faker/node_modules/.pnpm/jiti@1.21.6/node_modules/jiti/dist/jiti.js:1:247313)
    at jiti (/home/runner/work/faker/faker/node_modules/.pnpm/jiti@1.21.6/node_modules/jiti/dist/jiti.js:1:245241)
    at /home/runner/work/faker/faker/node_modules/.pnpm/jiti@1.21.6/node_modules/jiti/dist/jiti.js:1:24[8](https://github.com/faker-js/faker/actions/runs/10329602297/job/28597594550?pr=3044#step:6:9)272
    at Generator.next (<anonymous>)
    at /home/runner/work/faker/faker/node_modules/.pnpm/[email protected]/node_modules/jiti/dist/jiti.js:1:238153
    at new Promise (<anonymous>)
    at __awaiter (/home/runner/work/faker/faker/node_modules/.pnpm/[email protected]/node_modules/jiti/dist/jiti.js:1:237714)
    at jiti.import (/home/runner/work/faker/faker/node_modules/.pnpm/[email protected]/node_modules/jiti/dist/jiti.js:1:248217)
    at loadFlatConfigFile (/home/runner/work/faker/faker/node_modules/.pnpm/eslint@[9](https://github.com/faker-js/faker/actions/runs/10329602297/job/28597594550?pr=3044#step:6:10)[email protected]/node_modules/eslint/lib/eslint/eslint.js:383:41)
    at async calculateConfigArray (/home/runner/work/faker/faker/node_modules/.pnpm/[email protected][email protected]/node_modules/eslint/lib/eslint/eslint.js:473:28)
    at async ESLint.lintFiles (/home/runner/work/faker/faker/node_modules/.pnpm/[email protected][email protected]/node_modules/eslint/lib/eslint/eslint.js:905:25)
    at async Object.execute (/home/runner/work/faker/faker/node_modules/.pnpm/[email protected][email protected]/node_modules/eslint/lib/cli.js:502:23)
    at async main (/home/runner/work/faker/faker/node_modules/.pnpm/[email protected][email protected]/node_modules/eslint/bin/eslint.js:[15](https://github.com/faker-js/faker/actions/runs/10329602297/job/28597594550?pr=3044#step:6:16)3:22)
 ELIFECYCLE  Command failed with exit code 2.

faker/eslint.config.ts

Lines 131 to 150 in cdf54e4

	//#region deprecation
	{
	plugins: {
	deprecation:
	// https://github.com/gund/eslint-plugin-deprecation/issues/78
	// @ts-expect-error: Just eat it!
	fixupPluginRules(eslintPluginDeprecation),
	},
	languageOptions: {
	parser: tseslint.parser,
	parserOptions: {
	project: true,
	warnOnUnsupportedTypeScriptVersion: false,
	},
	},
	rules: {
	'deprecation/deprecation': 'error',
	},
	},
	//#endregion

[Shinigami92]

When using eslint.config.ts we need to import eslint-plugin-deprecation via * as syntax, because we do not have esModuleInterop turned on

[hyoban]

Try the following settings for vscode

{
  "eslint.options": {
    "flags": ["unstable_ts_config"]
  }
}

[Shinigami92]

Merging this already, because it had approvals in the past, but we just focused on v9.0.1