Add eslint config

.gitignore

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+node_modules/

.prettierrc.js

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+export default {
+  singleQuote: true,
+  trailingComma: 'all',
+};

eslint.config.mjs

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+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import prettierConfig from 'eslint-config-prettier';
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.strictTypeChecked,
+  ...tseslint.configs.stylisticTypeChecked,
+  prettierConfig,
+  {
+    languageOptions: {
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+);

package.json

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+{
+  "name": "eslint-config-sysless",
+  "version": "1.0.0",
+  "main": "index.js",
+  "repository": "https://github.com/sysless/dotfiles",
+  "author": "Arthur Lorotte de Banes <arthur@sysless.com>",
+  "license": "MIT",
+  "dependencies": {
+    "@eslint/js": "^9.13.0",
+    "@types/eslint__js": "^8.42.3",
+    "eslint": "^9.13.0",
+    "eslint-config-prettier": "^9.1.0",
+    "prettier": "^3.3.3",
+    "typescript": "^5.6.3",
+    "typescript-eslint": "^8.12.2"
+  }
+}