diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 0d4b99f2b..c904f389c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -60,6 +60,9 @@ jobs:
   wasm:
     name: Wasm
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./playground
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
@@ -74,11 +77,13 @@ jobs:
           path: ./playground/node_modules
           key: ${{ hashFiles('./playground/package.json') }}
       - name: Build playground
-        run: cd ./playground && make build
+        run: make build
       - name: Lint playground
-        run: cd ./playground && npm run lint
+        run: npm run lint
       - name: Run tests for wasm
-        run: cd ./playground && npm test
+        run: npm test
+      - name: Check eslint config
+        run: npx tsc --checkJs --noEmit  --module nodenext --strict eslint.config.mjs
   lint:
     name: Lint
     runs-on: ubuntu-latest
diff --git a/playground/.eslintrc.json b/playground/.eslintrc.json
deleted file mode 100644
index f8df5346b..000000000
--- a/playground/.eslintrc.json
+++ /dev/null
@@ -1,51 +0,0 @@
-{
-    "root": true,
-    "env": {
-        "browser": true,
-        "es2021": true,
-        "mocha": true
-    },
-    "extends": [
-        "eslint:recommended",
-        "plugin:@typescript-eslint/recommended"
-    ],
-    "plugins": [
-        "@typescript-eslint"
-    ],
-    "parser": "@typescript-eslint/parser",
-    "parserOptions": {
-        "ecmaVersion": 12,
-        "project": "./tsconfig.json"
-    },
-    "globals": {
-        "CodeMirror": "readonly",
-        "isMobile": "readonly",
-        "Go": "readonly"
-    },
-    "rules": {
-        "indent": [
-            "error",
-            4
-        ],
-        "linebreak-style": [
-            "error",
-            "unix"
-        ],
-        "quotes": [
-            "error",
-            "single"
-        ],
-        "semi": [
-            "error",
-            "always"
-        ],
-        "eqeqeq": [
-            "error",
-            "always"
-        ],
-        "no-constant-condition": [
-            "error",
-            { "checkLoops": false }
-        ]
-    }
-}
diff --git a/playground/eslint.config.mjs b/playground/eslint.config.mjs
new file mode 100644
index 000000000..0f81bd152
--- /dev/null
+++ b/playground/eslint.config.mjs
@@ -0,0 +1,37 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import ts from 'typescript-eslint';
+
+export default ts.config(
+    eslint.configs.recommended,
+    ...ts.configs.recommendedTypeChecked,
+    {
+        languageOptions: {
+            parserOptions: {
+                project: true,
+                tsconfigRootDir: import.meta.dirname,
+            },
+        },
+    },
+    {
+        files: ['index.ts', 'test.ts'],
+        rules: {
+            indent: ['error', 4],
+            quotes: ['error', 'single'],
+            'linebreak-style': ['error', 'unix'],
+            semi: ['error', 'always'],
+            eqeqeq: ['error', 'always'],
+            'no-constant-condition': ['error', { checkLoops: false }],
+            '@typescript-eslint/no-unsafe-member-access': 'off',
+            '@typescript-eslint/no-unsafe-argument': 'off',
+            '@typescript-eslint/no-unsafe-assignment': 'off',
+        },
+    },
+    {
+        files: ['test.ts'],
+        rules: {
+            '@typescript-eslint/unbound-method': 'off', // For checking `window.runActionlint`
+        },
+    }
+);
diff --git a/playground/index.ts b/playground/index.ts
index 25a3b0c55..6e14a0511 100644
--- a/playground/index.ts
+++ b/playground/index.ts
@@ -264,6 +264,7 @@ jobs:
         }
     });
 
+    // eslint-disable-next-line @typescript-eslint/no-misused-promises
     checkUrlButton.addEventListener('click', async e => {
         e.preventDefault();
         const input = checkUrlInput.value;
diff --git a/playground/package.json b/playground/package.json
index 3c1bab831..24ace600a 100644
--- a/playground/package.json
+++ b/playground/package.json
@@ -32,15 +32,15 @@
   "devDependencies": {
     "@peculiar/webcrypto": "^1.4.5",
     "@types/codemirror": "^5.60.15",
+    "@types/eslint__js": "^8.42.3",
     "@types/node": "^20.11.24",
     "@types/pako": "^2.0.3",
-    "@typescript-eslint/eslint-plugin": "^7.1.1",
-    "@typescript-eslint/parser": "^7.1.1",
     "eslint": "^8.57.0",
     "http-server": "^14.1.1",
     "prettier": "^3.2.5",
     "stylelint": "^16.2.1",
     "stylelint-config-standard": "^36.0.0",
-    "typescript": "^5.3.3"
+    "typescript": "^5.3.3",
+    "typescript-eslint": "^7.1.1"
   }
 }
diff --git a/playground/test.ts b/playground/test.ts
index 20b67f8cb..8d37a8f5d 100644
--- a/playground/test.ts
+++ b/playground/test.ts
@@ -64,6 +64,9 @@ jobs:
         const go = new Go();
         const bin = await fs.readFile('./main.wasm');
         const result = await WebAssembly.instantiate(bin, go.importObject);
+
+        // Do not `await` this method call since it will never be settled
+        // eslint-disable-next-line @typescript-eslint/no-floating-promises
         go.run(result.instance);
     });