test: ✅ add integration for tsc against current fixtures

tests/fixtures/integration/config/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "noEmit": true,
+    "allowJs": true
+  }
+}

tests/integration/test.ts

@@ -65,5 +65,21 @@ for (const dirent of fs.readdirSync(TEST_FIXTURES_ROOT, {
         }
       }
     })
+
+    it("should NOT fail when running tsc", () => {
+      try {
+        cp.execSync(`npx tsc`, { cwd: TEST_CWD })
+
+        assert.fail("Expect error")
+      } catch (e: any) {
+        const result = `${e.stdout}`
+        try {
+          assert.equal(result, "undefined")
+        } catch (e) {
+          console.error(e)
+          throw e
+        }
+      }
+    })
   })
 }