fix: support new vitest typings

package.json

@@ -60,6 +60,7 @@
         "@types/node": "^18.16.3",
         "@typescript-eslint/eslint-plugin": "^5.59.2",
         "@typescript-eslint/parser": "^5.59.2",
+        "@vitest/expect": "^0.31.0",
         "esbuild": "^0.17.18",
         "eslint": "^8.39.0",
         "eslint-config-prettier": "^8.8.0",

src/vitest/register.ts

@@ -3,22 +3,27 @@ import { afterEach, beforeEach, expect } from 'vitest';
 
 import { register as __register, toBeAnnounced } from '../to-be-announced';
 
-interface ToBeAnnouncedMatchers {
+interface ToBeAnnouncedMatchers<T = any> {
     /**
      * Assert whether given message was announced by ARIA live region.
      *
      * @param politenessSetting `POLITENESS_SETTING` of the announcement
      */
-    toBeAnnounced(politenessSetting?: Exclude<PolitenessSetting, 'off'>): void;
+    toBeAnnounced(politenessSetting?: Exclude<PolitenessSetting, 'off'>): T;
 }
 
+declare module '@vitest/expect' {
+    interface Assertion<T> extends ToBeAnnouncedMatchers<T> {}
+}
+
+// For Vitest below 0.31.x
 declare global {
     namespace Vi {
-        interface Assertion extends ToBeAnnouncedMatchers {}
+        interface Assertion<T> extends ToBeAnnouncedMatchers<T> {}
     }
 }
 
-expect.extend({ toBeAnnounced });
+(expect as any).extend({ toBeAnnounced });
 
 /**
  * Register `extend-to-be-expected` to track DOM nodes