fix: support mobile access when dev server binds to 0.0.0.0

[42tg]

Summary

• Vite dev server respects T3CODE_HOST env var for network binding (e.g. T3CODE_HOST=0.0.0.0)
• HMR auto-detects host when binding to 0.0.0.0 instead of hardcoding localhost
• Add T3CODE_HOST to turbo.json global env passthrough

Test plan

• Run with T3CODE_HOST=0.0.0.0 bun dev and access from another device on the same network
• Verify HMR still works when accessing from a remote host
• Verify default localhost behavior is unchanged when T3CODE_HOST is not set

---

Note

Low Risk
Low risk dev-only configuration and URL resolution changes; main risk is misrouting HMR/WebSocket connections when running with custom hosts.

Overview
Improves remote-device access to the dev server by making Vite bind to a configurable host via T3CODE_HOST (defaulting to localhost) and adjusting HMR config to avoid hardcoding localhost when not running locally.

Updates resolveServerUrl to rewrite localhost to the current window.location.hostname when the app is accessed from a non-localhost host, ensuring WebSocket connections reach the correct machine. Exposes T3CODE_HOST through Turborepo globalEnv so the setting propagates in tasks.

^{Written by Cursor Bugbot for commit a2a9afe. This will update automatically on new commits. Configure here.}

Note

Fix mobile access when dev server binds to 0.0.0.0

• Adds T3CODE_HOST env var support to vite.config.ts so the dev server binds to a configurable host (default localhost). HMR omits an explicit host when not on localhost to allow correct host resolution.
• Updates resolveServerUrl in utils.ts to replace localhost in resolved URLs with window.location.hostname when the page is accessed from a non-localhost host.
• Exposes T3CODE_HOST as a global env var in turbo.json.

^{Macroscope summarized a2a9afe.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository. Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: b19d87fa-e6cf-4e13-a090-e23d9cca75b6

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[macroscopeapp]

Approvability

Verdict: Approved

Development tooling change to support mobile device testing when the dev server binds to 0.0.0.0. The changes are limited to Vite config and a simple URL replacement for non-localhost access - no production behavior is affected.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

[cursor]

Naive string replace risks matching localhost in non-hostname positions

Low Severity

rawUrl.includes("localhost") and rawUrl.replace("localhost", ...) perform raw string matching rather than targeting the URL's hostname specifically. Since new URL(rawUrl) is constructed on the very next line, the hostname check and replacement could be done on the parsed URL object (e.g., parsedUrl.hostname === "localhost" and parsedUrl.hostname = window.location.hostname), avoiding any risk of matching "localhost" as a substring in paths, query params, or other hostname parts like notlocalhost.example.com.