feat(sveltekit): Ensure AsyncLocalStorage async context strategy is used in Cloudflare Pages (#15557)

We need to call `@sentry/cloudflare`'s
`setAsyncLocalStorageAsyncContextStrategy` function as otherwise, we
don't get working request isolation.

This patch exports `setAsyncLocalStorageAsyncContextStrategy` from
`@sentry/cloudflare` so that we can call it in the `initCloudflareSentryHandle`
function.

Author: Lms24

packages/cloudflare/src/async.ts

@@ -10,6 +10,9 @@ import { AsyncLocalStorage } from 'node:async_hooks';
  *
  * AsyncLocalStorage is only available in the cloudflare workers runtime if you set
  * compatibility_flags = ["nodejs_compat"] or compatibility_flags = ["nodejs_als"]
+ *
+ * @internal Only exported to be used in higher-level Sentry packages
+ * @hidden Only exported to be used in higher-level Sentry packages
  */
 export function setAsyncLocalStorageAsyncContextStrategy(): void {
   const asyncStorage = new AsyncLocalStorage<{

packages/cloudflare/src/index.ts

@@ -98,3 +98,5 @@ export { getDefaultIntegrations } from './sdk';
 export { fetchIntegration } from './integrations/fetch';
 
 export { instrumentD1WithSentry } from './d1';
+
+export { setAsyncLocalStorageAsyncContextStrategy } from './async';

packages/sveltekit/src/worker/cloudflare.ts

@@ -1,4 +1,8 @@
-import { type CloudflareOptions, wrapRequestHandler } from '@sentry/cloudflare';
+import {
+  type CloudflareOptions,
+  wrapRequestHandler,
+  setAsyncLocalStorageAsyncContextStrategy,
+} from '@sentry/cloudflare';
 import { getDefaultIntegrations as getDefaultCloudflareIntegrations } from '@sentry/cloudflare';
 import type { Handle } from '@sveltejs/kit';
 
@@ -17,6 +21,8 @@ export function initCloudflareSentryHandle(options: CloudflareOptions): Handle {
     ...options,
   };
 
+  setAsyncLocalStorageAsyncContextStrategy();
+
   const handleInitSentry: Handle = ({ event, resolve }) => {
     // if event.platform exists (should be there in a cloudflare worker), then do the cloudflare sentry init
     if (event.platform) {