add eslint

client/.eslintrc.json

@@ -0,0 +1,21 @@
+{
+    "env": {
+        "browser": true,
+        "es2021": true
+    },
+    "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:react/jsx-runtime",
+        "prettier"
+    ],
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+        "ecmaVersion": "latest",
+        "sourceType": "module"
+    },
+    "plugins": [
+        "@typescript-eslint",
+        "react"
+    ]
+}

client/package.json

@@ -18,6 +18,11 @@
     "@parcel/validator-typescript": "^2.10.3",
     "@types/react": "^18.2.45",
     "@types/react-dom": "^18.2.17",
+    "@typescript-eslint/eslint-plugin": "^6.14.0",
+    "@typescript-eslint/parser": "^6.14.0",
+    "eslint": "^8.55.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-react": "^7.33.2",
     "parcel": "^2.10.3",
     "prettier": "^3.1.1",
     "process": "^0.11.10",

client/src/App.tsx

@@ -1,3 +1,3 @@
 export function App() {
     return <h1>Hello worlffffd!</h1>;
-}
+}