perf(nuxt): use granular watcher to avoid crawling ignored dirs

[danielroe]

🔗 Linked issue

#12376

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This follows up previous focus on watcher improvements (#20179) as a hybrid solution using chokidar - it filters out/ignores child directories within srcDir directly. In tests in the monorepo, it reduces chokdar startup on a M1 Mac by 50%. I would expect even more significant performance improvements on a windows machine.

To enable this you'll need to set experimental.watcher to granular. (Otherwise behaviour will stay the same as currently.)

I'd appreciate review - my main concern is whether we ought to make provision for users deliberately seeking to watch changes in .nuxt or node_modules (which they have enabled with a negative glob pattern in ignore).

cc: @stafyniaksacha

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[danielroe]

/trigger release

[github-actions]

🚀 Release triggered! You can now install nuxt@npm:nuxt3@pr-20836

[github-actions]

🚀 Release triggered! You can now install nuxt@npm:nuxt3@pr-20836

[danielroe]

/trigger release

[github-actions]

🚀 Release triggered! You can now install nuxt@npm:nuxt3@pr-20836

[antfu]

Amazing idea! Love the approach!