fix: support "using" keyword

.eslintignore

@@ -12,3 +12,4 @@ docs/.vitepress/cache/deps/*.*
 test/core/src/self
 test/workspaces/results.json
 test/reporters/fixtures/with-syntax-error.test.js
+using-feature.test.ts

test/core/test/using-feature.test.ts

@@ -0,0 +1,27 @@
+import { test, expect } from 'vitest'
+
+// @ts-expect-error - readonly symbol, but might not be assigned
+Symbol.dispose ??= Symbol('dispose')
+
+const resourceful = (resourceDefault: string) => {
+  let resource: string | null = resourceDefault
+  return {
+    get resource() {
+      return resource
+    },
+    [Symbol.dispose]: () => {
+      resource = null
+    },
+  }
+}
+
+test('new "using" feature', () => {
+  let getResource = (): any => {
+    throw new Error('don\'t call me')
+  }
+  {
+    using resource = resourceful('foo')
+    getResource = () => resource.resource
+  }
+  expect(getResource()).toBe(null)
+})