test(nextjs): Added nextjs CF workers test app

[logaretm]

This PR sets up E2E tests for Next.js 16 running on Cloudflare Workers using OpenNext.

Some tests yield different transaction names and span attributes, I will review each of the skipped tests and review the differences and if we should either consolidate the edge runtime behavior with the node runtime behavior.

Known Limitations

Those are the test failures that required skipping.

• Middleware proxy filename not being picked up by opennext, yet middleware works on Next 16 😕
• HTTP request headers not extracted as span attributes
• Metrics not emitting on Cloudflare Workers
• Middleware transaction_info.source is 'url' instead of 'route'
• Server component spans have different names (e.g., 'resolve segment modules' instead of specific component names)
• Missing http.response.status_code / http.status_code attributes

I plan to follow up with another PR to address these, but the higher priority is making sure the SDK doesn't crash and works to some degree on CF worker apps.

Closes #18929 (added automatically)

[linear]

JS-1529 Add Next.js E2E tests on Cloudflare Workers runtime

[Copilot]

Pull request overview

This PR adds E2E tests for Next.js 16 running on Cloudflare Workers using OpenNext. The primary goal is to verify that the Sentry SDK doesn't crash when running in this environment, with several tests intentionally skipped due to known limitations in the CF Workers runtime.

Changes:

• New test application configuration for Next.js 16 on Cloudflare Workers with OpenNext
• Comprehensive test suite covering various Next.js features (middleware, server components, route handlers, ISR, metrics)
• Multiple tests are skipped with TODOs noting CF Workers-specific limitations

Reviewed changes

Copilot reviewed 57 out of 63 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
wrangler.jsonc	Cloudflare Workers configuration with nodejs_compat and asset bindings
package.json	Dependencies and build scripts for CF Workers deployment
tsconfig.json	TypeScript configuration for the test application
next.config.ts	Next.js configuration with Sentry integration
open-next.config.ts	OpenNext configuration for Cloudflare deployment
playwright.config.mjs	Playwright test configuration
sentry.server.config.ts	Server-side Sentry configuration
sentry.edge.config.ts	Edge runtime Sentry configuration
instrumentation.ts	Server instrumentation with onRequestError hook
instrumentation-client.ts	Client-side instrumentation
middleware.ts	Edge middleware implementation
tests/*.test.ts	Test files covering various Next.js features with CF Workers
app/*	Test application pages, layouts, and route handlers

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[andreiborza]

LGTM

[chargome]

Should we switch to proxy.ts?

[logaretm]

Opennext + CF workers don't work with proxy yet, but it works with Next.js 16 somehow, I think CF workers convert it to a serverless function or something. I will take a look later.

[tristanbes]

Middleware proxy filename not being picked up by opennext, yet middleware works on Next 16 😕

FYI its a known opennext cloudflare adapter limitation; they don't support proxy middleware yet @logaretm .

Issues to track:

• Next16 support opennextjs/opennextjs-cloudflare#972
• Improve Next16 support opennextjs/opennextjs-cloudflare#1082