🔧 chore: add root ESLint config and enable lint in pre-commit

- Add eslint.config.mjs at root with TypeScript/JS rules
- Configure lint-staged to run ESLint --fix on JS/TS files
- Add ESLint dependencies to root package.json
- Set "type": "module" in package.json to fix module warning
- Ignore projects with their own ESLint configs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

eslint.config.mjs

@@ -0,0 +1,67 @@
+// @ts-check
+import eslint from '@eslint/js';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+/**
+ * Root ESLint config for the monorepo.
+ * Individual projects can override with their own eslint.config.* files.
+ */
+export default tseslint.config(
+	// Global ignores
+	{
+		ignores: [
+			'**/node_modules/**',
+			'**/dist/**',
+			'**/build/**',
+			'**/.svelte-kit/**',
+			'**/.expo/**',
+			'**/.next/**',
+			'**/coverage/**',
+			'**/apps-archived/**',
+			// Ignore projects with their own ESLint configs
+			'apps/manadeck/apps/mobile/**',
+			'apps/picture/apps/mobile/**',
+			'apps/picture/apps/web/**',
+			'games/voxel-lava/apps/web/**',
+		],
+	},
+	// Base JavaScript rules
+	eslint.configs.recommended,
+	// TypeScript rules (without type-checking for speed)
+	...tseslint.configs.recommended,
+	// Prettier integration
+	eslintPluginPrettierRecommended,
+	// Global settings
+	{
+		languageOptions: {
+			globals: {
+				...globals.node,
+				...globals.browser,
+				...globals.es2022,
+			},
+			ecmaVersion: 2022,
+			sourceType: 'module',
+		},
+	},
+	// TypeScript-specific rules (relaxed for monorepo compatibility)
+	{
+		files: ['**/*.ts', '**/*.tsx', '**/*.mts', '**/*.cts'],
+		rules: {
+			'@typescript-eslint/no-explicit-any': 'off',
+			'@typescript-eslint/no-unused-vars': [
+				'warn',
+				{ argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
+			],
+			'@typescript-eslint/no-require-imports': 'off',
+		},
+	},
+	// JavaScript-specific rules
+	{
+		files: ['**/*.js', '**/*.jsx', '**/*.mjs', '**/*.cjs'],
+		rules: {
+			'no-unused-vars': ['warn', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }],
+		},
+	}
+);

lint-staged.config.js

@@ -1,3 +1,4 @@
 export default {
-	'*.{ts,tsx,js,jsx,json,md,svelte,astro}': ['prettier --config .prettierrc.json --write'],
+	'*.{ts,tsx,js,jsx,mjs,cjs}': ['eslint --fix', 'prettier --config .prettierrc.json --write'],
+	'*.{json,md,svelte,astro}': ['prettier --config .prettierrc.json --write'],
 };

package.json

@@ -2,6 +2,7 @@
 	"name": "manacore-monorepo",
 	"version": "1.0.0",
 	"private": true,
+	"type": "module",
 	"description": "Manacore Monorepo containing manacore, manadeck, picture, chat, zitare, and presi",
 	"scripts": {
 		"dev": "turbo run dev",
@@ -116,7 +117,12 @@
 		"prepare": "husky"
 	},
 	"devDependencies": {
+		"@eslint/js": "^9.39.1",
 		"concurrently": "^9.2.0",
+		"eslint": "^9.39.1",
+		"eslint-config-prettier": "^10.1.8",
+		"eslint-plugin-prettier": "^5.5.4",
+		"globals": "^16.5.0",
 		"husky": "^9.1.7",
 		"lint-staged": "^16.2.7",
 		"prettier": "^3.3.3",
@@ -124,6 +130,7 @@
 		"prettier-plugin-svelte": "^3.4.0",
 		"turbo": "^2.3.0",
 		"typescript": "^5.9.3",
+		"typescript-eslint": "^8.48.1",
 		"wrangler": "^4.51.0"
 	},
 	"engines": {