fix: remove no nullable type from I18nMiddleware

package.json

@@ -56,7 +56,7 @@
     "build": "unbuild",
     "play:basic": "bun run ./playground/basic/index.ts",
     "test": "npm run test:type && npm run test:unit",
-    "test:type": "vitest typecheck --run",
+    "test:type": "vitest run --typecheck",
     "test:unit": "vitest run",
     "test:coverage": "npm test -- --reporter verbose --coverage"
   },
@@ -71,15 +71,15 @@
   "devDependencies": {
     "@types/node": "^20.6.0",
     "@types/supertest": "^2.0.12",
-    "@vitest/coverage-v8": "^1.0.0-beta.2",
+    "@vitest/coverage-v8": "^1.0.0-beta.4",
     "bumpp": "^9.2.0",
     "gh-changelogen": "^0.2.8",
     "h3": "^1.8.2",
     "lint-staged": "^15.0.2",
     "supertest": "^6.3.3",
     "typescript": "^5.2.2",
     "unbuild": "^2.0.0",
-    "vitest": "^1.0.0-beta.2"
+    "vitest": "^1.0.0-beta.4a"
   },
   "dependencies": {
     "@intlify/core": "^9.6.0",

src/index.ts

@@ -46,11 +46,11 @@ export interface I18nMiddleware {
   /**
    * `onRequest` option of `createApp`
    */
-  onRequest: AppOptions['onRequest']
+  onRequest: NonNullable<AppOptions['onRequest']>
   /**
    * `onAfterResponse` option of `createApp`
    */
-  onAfterResponse: AppOptions['onAfterResponse']
+  onAfterResponse: NonNullable<AppOptions['onAfterResponse']>
 }
 
 /**
@@ -101,10 +101,7 @@ export function defineI18nMiddleware<
   >,
 >(
   options: Options,
-): {
-  onRequest: AppOptions['onRequest']
-  onAfterResponse: AppOptions['onAfterResponse']
-} {
+): I18nMiddleware {
   const i18n = createCoreContext(options as CoreOptions)
   const orgLocale = i18n.locale