fix: handle non-regular files in dev watcher to prevent crashes

[RomanBaiocco]

Summary

Fixes #14855

react-router dev crashes when Unix socket files (.sock) exist in the project root directory. This commonly happens when using process managers like overmind or pm2, which create socket files in the working directory.

The crash occurs because @react-router/dev's chokidar v4 watcher attempts to call fs.watch() on socket files, which fails on macOS with UNKNOWN: unknown error, watch (errno -102).

Changes

• Extract the watcher's ignored callback into an exported isIgnoredByWatcher function for testability
• Run cheap path-based checks before fs.statSync to avoid unnecessary syscalls on already-ignored paths
• Filter non-regular files (sockets, pipes, etc.) via fs.statSync so chokidar never tries to watch them
• Add an error event handler on the watcher so unexpected errors log a warning via picocolors instead of crashing the process
• Add tests covering regular files, directories, socket files, and already-ignored paths

Reproduction

Full repro repo with steps: https://github.com/RomanBaiocco/react-router-sock-repro

Quick repro:

npx create-react-router@latest my-app
cd my-app
node -e "require('net').createServer().listen('./overmind.sock')" &
npx react-router dev  # crashes

Related

• Upstream chokidar issue: Cannot watch /var/run on macOS Sequoia with v4 paulmillr/chokidar#1391

[remix-cla-bot]

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[changeset-bot]

🦋 Changeset detected

Latest commit: 8231128

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@react-router/dev	Patch
@react-router/fs-routes	Patch
@react-router/remix-routes-option-adapter	Patch
create-react-router	Patch
react-router	Patch
react-router-dom	Patch
@react-router/architect	Patch
@react-router/cloudflare	Patch
@react-router/express	Patch
@react-router/node	Patch
@react-router/serve	Patch

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳