[mikn]

As of 2026-10-28, a large TanStack Start + Cloudflare app under ts_dev_server on oj 0.2.49 takes about 300 s to listen, or never listens within 340 s, and its Worker errors are lost. oj defers the client bundle only when the --config file's text names @cloudflare/vite-plugin, and the generated config reaches the plugin through an import alone.

1. What changes: a new cloudflare attr on ts_dev_server, which requires vite_config. The generated config names the plugin and sets a stdout/stderr customLogger. Gazelle sets the attr when vite_config, or a vite.config.* it names, names the plugin.
2. Goal: Cloudflare apps' dev servers start in usable time, and Worker failures can be debugged.
3. Evidence: on such an app, on top of chore(oj): bump the default dev server to oj 0.2.49 from git upstream #372, the server listens at about 170 s instead of never or about 300 s, and the log shows the Worker's stack trace.
4. Risk/rollback: opt-in; configs without the attr don't change. Revert, or drop the attr.
5. Next: based on main after chore(oj): bump the default dev server to oj 0.2.49 from git upstream #372; nothing stacks on it.

Why a logger

oj resolves its plugins' config at logLevel: 'silent', so the Cloudflare plugin's Miniflare logger dropped the Worker's console.error, warnings and uncaught exceptions. Vite's createLogger returns a customLogger unchanged, so setting one bypasses the silent level. Every plugin's info lines print as well, unfiltered by logLevel.

Observed in production: no; dev-server only, found by a dev-server route test.
Gain: listen at about 170 s instead of 300 s or never; Worker errors visible.

Tests

• TestDevServer_CloudflareFollowsTheViteConfig (one table test, Gazelle convergence): the plugin named in vite_config sets the attr, so does a vite.config.ts it loads, and an unloaded one removes it.
• TestCloudflareConfigNamesThePluginForOj (unit): the config contains the string oj searches for.
• TestCloudflareConfigLogsWorkerErrors (unit): the evaluated config's customLogger.error writes to stderr.

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