Run the React Router e2e suite on Bun, Deno and Cloudflare from one app #24836

Run the React Router e2e suite on Node, Bun, Deno and Cloudflare from one app. Node stays the required job; Bun, Deno and Cloudflare are optional variants that become required once green.

Apps

• Base: react-router-8-framework
• Fold in, then delete: react-router-8-cloudflare

Cover on every runtime

The existing suite runs unchanged and branches on RUNTIME only where runtimes are expected to differ. Add assertions where the suite has none today:

• Errors (test(e2e): Add Bun, Deno and Cloudflare variants to react-router-8-framework #24598)
• Parameterized route names: pages, resource routes and server errors (feat(react-router): Export createSentryServerInstrumentation from the Cloudflare entry #25042)
• Per-request isolation (test(e2e): Cover isolation, trace propagation and logs on all react-router-8-framework runtimes #25041)
• Incoming trace continuation (test(e2e): Cover isolation, trace propagation and logs on all react-router-8-framework runtimes #25041)
• Outgoing fetch with sentry-trace and baggage (test(e2e): Cover isolation, trace propagation and logs on all react-router-8-framework runtimes #25041)
• Logs (test(e2e): Cover isolation, trace propagation and logs on all react-router-8-framework runtimes #25041)

Findings (runtime audit, September 2026, develop 6f2da7483d; database spans were measured with mysql or mysql2). The e2e suite now checks them:

• Bun: route names, isolation, incoming trace, outgoing fetch and db spans (mysql, ioredis) work with @sentry/bun. Under bun run, Express inside react-router-serve gets no spans, because Bun has no runtime hook for the SDK (fix(runtime): preserve named exports of plugin-loaded CommonJS modules oven-sh/bun#31770). With Bun.build() and sentryBunPlugin, Express gets spans.
• Deno: outgoing fetch (deno: Outgoing fetch gets no span and no trace propagation #23891) and db spans (mysql, ioredis) work. Deno 2.9 or later is required.
• Cloudflare: everything works.
• Bun, Deno and Cloudflare send spans for /__manifest and favicon.ico, because only the init() of @sentry/react-router adds the filter for them.

Setups the audit ran: Bun, Deno, Cloudflare

Done when

• react-router-8-framework runs its suite on Node, Bun, Deno and Cloudflare (test(e2e): Add Bun, Deno and Cloudflare variants to react-router-8-framework #24598)
• Every variant is green and required, or this issue records why a runtime is not supported (test(e2e): Cover isolation, trace propagation and logs on all react-router-8-framework runtimes #25041)
• react-router-8-cloudflare is deleted (test(e2e): Move react-router-8-cloudflare MySQL tests into react-router-8-framework #24599)
• SDK defects the variants surface are fixed here, or split into their own issue when the fix is large or shared with other libraries: fixed in fix(react-router): Resolve the Cloudflare entry in Workers and skip trace meta tags in prerendered pages #24866 and feat(react-router): Export createSentryServerInstrumentation from the Cloudflare entry #25042; fix(server-utils): Transform modules once when two Sentry Vite plugins add orchestrion #25043 (both Sentry Vite plugins on Cloudflare) is open