feat(FileUpload): add new component FileUpload

[vachmara]

🔗 Linked issue

Resolves #1945

❓ 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)
• ✨ 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 PR introduces the FileUpload component, a long-requested feature by the Nuxt UI community (see #1945).

The FileUpload component provides a customizable and accessible file input that supports:

• File selection via input or drag-and-drop
• Multiple file selection
• File preview (only for images if not display an icon)
• Removal of selected files
• Customization via slots

📝 Checklist

• I have linked an issue or discussion.
• The component is available in the playground.
• I have updated the documentation accordingly.
• I have added tests to cover this component.

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@4102

commit: f6d139d

[vachmara]

Would love to hear your feedback on this when you have a moment, @rdjanuar @benjamincanac, happy to iterate based on your suggestions!

[rdjanuar]

Thank you for continuing this development @vachmara, actually i'm already done working on this feature but missing only style of component and forget to push it, you can take a look my implementation #2814. maybe on this week i can finish it @benjamincanac

[kaspernowak]

@vachmara Thank you for this! And also for mentioning it on #1945 which I follow :)

@rdjanuar good to hear that your implementation of this feature is near completion!
I took the time to compare the features in @vachmara's component with the features in #2814, and I feel like these features would be very useful implementations worth to consider:

1. Image-preview management (essential IMO)
   • Automatically creates and revokes URL.createObjectURL thumbnails for image files.
   • Cleans up previews on file removal and component unmount.
2. Form-field integration
   • Uses a useFormField composable to wire up blur/focus/change events and aria- attributes automatically.
3. Themed size-variants & slots
   • size variants (xs→xl) that adjust dimensions, padding, icon/avatar sizes.
   • Fully overridable slot props (ui.empty, ui.file, etc.) via tv() + appConfig.ui.fileUpload overrides.
4. Custom loading state
   • loading boolean + loadingIcon prop so consumers can show a spinner while files upload.
5. Built-in file-list UI
   • A <ul> of selected files with filename, size (in MB), avatar/icon preview, and “remove” button.
6. Customizable icons
   • Separate uploadIcon, fileIcon and close icons exposed as props.

[vachmara]

Hey @rdjanuar,

I noticed you've already done an excellent job on the logic. I honestly thought the feature was abandoned, and I should’ve checked in earlier, sorry about that. I’d be more than happy to help polish and push this component forward with you!

@kaspernowak, thanks for pointing out the main functionalities I implemented; spot on!

I’d also like to mention that the file type validation, which you handled nicely, was something I intentionally left out to maintain compatibility with FormField and Form, with the idea of using external validation libraries for that kind of logic. That said, I'm totally open to discussing the best approach here.

I think both of our implementations bring valuable logic, and it'd be great to merge the best of both. There’s still a bit of work to be done, proper testing (for Vue & Nuxt), improving some functionality (UI/UX, core logic like disabled etc..), and writing the proper documentation.

Don’t hesitate to share how you'd like to collaborate or areas you'd prefer me to focus on. Looking forward to working together!

[rdjanuar]

Hi @vachmara ,

I think I’ll keep my file validation as the default since it already covers all aspects of file upload. Later, I might create a function to allow overriding it based on a given schema. For now, I’ll focus on finishing my work first, and then we can collaborate on it.

[benjamincanac]

You're not making it easy guys haha

Can't we just keep one open and work together on it? I'd go for this one because it's most recent and follows the latest Nuxt UI components architecture pattern. You will both get the contribution anyway.

[rdjanuar]

sounds good @benjamincanac

[vachmara]

I’ve added tests and a minimal doc to get everyone started. If anything’s unclear or you’d like to see extra examples or features, just let me know, happy to iterate!