fix: add guards for common Next.js App Router mistakes (#499)

.eslintrc.cjs

@@ -35,7 +35,7 @@ module.exports = {
       },
     },
     {
-      files: ['test/**/*.ts'],
+      files: ['test/**/*.ts', 'test-next/**/*.ts'],
       rules: {
         '@typescript-eslint/no-non-null-assertion': 'off',
         '@typescript-eslint/no-explicit-any': 'off',

.github/workflows/ci.yml

@@ -173,3 +173,14 @@ jobs:
         with:
           name: build-output
       - run: npm run test:node-runtimes
+
+  next-runtime:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          cache: npm
+          node-version: lts/*
+      - run: npm install
+      - run: npm run test:next