chore: add ESLint flat config and update dependencies for improved linting support

Author: chojuninengu

apps/web/eslint.config.js

@@ -0,0 +1,29 @@
+import eslint from '@eslint/js';
+import ts from 'typescript-eslint';
+import svelte from 'eslint-plugin-svelte';
+import globals from 'globals';
+
+export default ts.config(
+	eslint.configs.recommended,
+	...ts.configs.recommended,
+	...svelte.configs['flat/recommended'],
+	{
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				...globals.node
+			}
+		}
+	},
+	{
+		files: ['**/*.svelte'],
+		languageOptions: {
+			parserOptions: {
+				parser: ts.parser
+			}
+		}
+	},
+	{
+		ignores: ['build/', '.svelte-kit/', 'dist/']
+	}
+);

apps/web/package.json

@@ -10,16 +10,23 @@
     "lint": "eslint src"
   },
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
     "@sveltejs/adapter-auto": "^3.0.0",
     "@sveltejs/kit": "^2.0.0",
     "@sveltejs/vite-plugin-svelte": "^4.0.0",
     "@tailwindcss/vite": "^4.2.2",
+    "@typescript-eslint/eslint-plugin": "^8.58.0",
+    "@typescript-eslint/parser": "^8.58.0",
     "eslint": "^9.0.0",
+    "eslint-plugin-svelte": "^3.17.0",
+    "globals": "^17.4.0",
     "svelte": "^5.0.0",
     "svelte-check": "^4.0.0",
     "tailwindcss": "^4.0.0",
     "typescript": "^5.0.0",
+    "typescript-eslint": "^8.58.0",
     "vite": "^6.0.0"
   },
-  "type": "module"
+  "type": "module",
+  "packageManager": "pnpm@10.24.0+sha512.01ff8ae71b4419903b65c60fb2dc9d34cf8bb6e06d03bde112ef38f7a34d6904c424ba66bea5cdcf12890230bf39f9580473140ed9c946fef328b6e5238a345a"
 }