fix(nuxi): restart nuxt when distDir is unlinked

[huang-julien]

🔗 Linked issue

resolve #15069

❓ 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)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Hi 👋
this adds a watcher on .nuxt/dist. The dev server would reload nuxt by itself if the dist directory has been removed.
This would avoid to manually restart the server.

Use case:

• Start dev server
• "Oh i forgot to add another package"
• npm install another-package in another terminal
• postinstall is run with nuxi prepare, clear buildDir
• dev server break 😢 -- dev server restart 👍
• ctrl + C, ⬆️ , enter, wait for server to restart --- nuxt ready

📝 Checklist

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

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[danielroe]

What a great idea!

[danielroe]

This is a very nice fix.

[pi0]

Good idea! We might extend/change it later to other dirs such as .cache since we not always remove top level dist