fix(cloudflare): Ensure types for cloudflare handlers (#18064)

This is fixing type safety for Cloudflare handlers. With that change the
tests have the correct types and vitest can run through 🚀

Author: JPeer264

dev-packages/e2e-tests/test-applications/cloudflare-hono/.npmrc

@@ -0,0 +1,2 @@
+@sentry:registry=http://127.0.0.1:4873
+@sentry-internal:registry=http://127.0.0.1:4873

dev-packages/e2e-tests/test-applications/cloudflare-hono/package.json

@@ -8,7 +8,7 @@
     "cf-typegen": "wrangler types --env-interface CloudflareBindings",
     "test:build": "pnpm install && pnpm build",
     "//": "Just checking if it builds correctly and types don't break",
-    "test:assert": "pnpm typecheck"
+    "test:assert": "pnpm typecheck && vitest run ."
   },
   "dependencies": {
     "@sentry/cloudflare": "latest || *",

packages/cloudflare/src/handler.ts

@@ -29,10 +29,16 @@ import { copyExecutionContext } from './utils/copyExecutionContext';
  * @returns The wrapped handler.
  */
 // eslint-disable-next-line complexity
-export function withSentry<Env = unknown, QueueHandlerMessage = unknown, CfHostMetadata = unknown>(
-  optionsCallback: (env: Env) => CloudflareOptions,
-  handler: ExportedHandler<Env, QueueHandlerMessage, CfHostMetadata>,
-): ExportedHandler<Env, QueueHandlerMessage, CfHostMetadata> {
+export function withSentry<
+  Env = unknown,
+  QueueHandlerMessage = unknown,
+  CfHostMetadata = unknown,
+  T extends ExportedHandler<Env, QueueHandlerMessage, CfHostMetadata> = ExportedHandler<
+    Env,
+    QueueHandlerMessage,
+    CfHostMetadata
+  >,
+>(optionsCallback: (env: Env) => CloudflareOptions, handler: T): T {
   setAsyncLocalStorageAsyncContextStrategy();
 
   try {