@galaxy-stack/nebula-cli

Nebula CLI

CLI for initializing Galaxy UI and copying framework-specific components (67 components × 5 frameworks: React, Vue, Angular, React Native, Flutter) into your project.

Features

• Commands: init, add, list, doctor, diff, update, migrate tailwind
• Detects React, Next.js, Vue, Nuxt.js, and Angular projects
• Stores project settings in components.json
• Scaffolds Tailwind in v4-first mode while preserving existing v3 projects
• Copies components into your source tree so they remain editable
• Fails clearly when remote component files cannot be fetched
• Theme presets: init --theme violet|green|blue|default
• Integrity-verified registry CDN (sha256 per file + release digest)

Changelog

See CHANGELOG.md — current version 1.0.0 (Nebula milestone).

Framework Mapping

nextjs and nuxtjs are CLI target frameworks, not separate published component packages.

• nextjs reuses the React source registry and adds Next-specific transforms such as 'use client' when required
• nuxtjs reuses the Vue source registry and keeps Vue/Nuxt-specific file structure intact

That means the package/source-of-truth layer is still React for Next.js and Vue for Nuxt.js, while the CLI adapts the copied files for the target app.

Installation

npx @galaxy-stack/nebula-cli@latest init

Or install globally:

npm install -g @galaxy-stack/nebula-cli
bun add -g @galaxy-stack/nebula-cli

Quick Start

1. Initialize

npx @galaxy-stack/nebula-cli@latest init

init currently does the following:

• Detects the framework
• Creates components.json
• Installs core dependencies
• Creates components/ui and the cn() utility
• Detects Tailwind v3/v4 and scaffolds the matching mode

Tailwind behavior:

• Existing Tailwind v3 project: stays on v3
• Existing Tailwind v4 project: stays on v4
• No Tailwind detected: installs/scaffolds v4 by default

1.5 Migrate Tailwind v3 To v4

npx @galaxy-stack/nebula-cli@latest migrate tailwind --dry-run
npx @galaxy-stack/nebula-cli@latest migrate tailwind --yes

migrate tailwind currently focuses on the safe scaffold layer:

• Detects whether the current project still uses Tailwind v3
• Rewrites the global CSS entry from @tailwind ... directives to @import "tailwindcss";
• Rewrites the PostCSS config to use @tailwindcss/postcss
• Updates components.json Tailwind version metadata when present
• Reports utility classes that may need manual review in Tailwind v4

It does not try to auto-rewrite every potentially breaking utility class.

2. Add Components

# Add one component
npx @galaxy-stack/nebula-cli@latest add button

# Add several components
npx @galaxy-stack/nebula-cli@latest add button input card

# Interactive selection
npx @galaxy-stack/nebula-cli@latest add

# Add everything in the current registry
npx @galaxy-stack/nebula-cli@latest add --all

Available Components

🎨 Form Components (9)

• button - Versatile button with variants and sizes
• input - Text input with label and validation states
• checkbox - Checkbox with indeterminate state
• radio-group - Radio button groups
• select - Dropdown select with search
• slider - Range slider input
• switch - Toggle switch
• textarea - Multi-line text input
• label - Accessible form labels

📐 Layout Components (4)

• separator - Horizontal/vertical divider
• accordion - Collapsible content sections
• collapsible - Single collapsible panel
• tabs - Tabbed content organization

🧭 Navigation Components (4)

• navigation-menu - Complex navigation with dropdowns
• menubar - Desktop-style menu bar
• context-menu - Right-click context menus
• dropdown-menu - Action dropdown menus

🔔 Overlay Components (5)

• dialog - Modal dialogs
• alert-dialog - Confirmation dialogs
• popover - Floating content containers
• tooltip - Hover tooltips
• hover-card - Preview cards on hover

📊 Data Display Components (6)

• avatar - User avatars with fallbacks
• progress - Progress bars and indicators
• table - Data tables with sorting
• pagination - Page navigation
• empty - Empty state placeholders
• skeleton - Loading skeletons

✍️ Typography & Utilities (2)

• typography - Text styles and components
• kbd - Keyboard shortcut display

📅 Date & Time Components (2)

• calendar - Date picker calendar
• calendar-range - Date range picker

⚡ Advanced Components (4)

• command - Command palette (⌘K)
• sheet - Slide-out panels
• toolbar - Action toolbars
• tags-input - Multi-value tag input

🎁 Bonus Components (5)

• aspect-ratio - Aspect ratio container
• badge - Status badges and labels
• card - Content cards
• scroll-area - Custom scrollbars
• toggle - Toggle buttons
• toggle-group - Toggle button groups

Framework Examples

React

import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';

export function MyComponent() {
  return (
    <div>
      <Button variant="default" size="lg">
        Click me
      </Button>
      <Input placeholder="Enter text..." />
    </div>
  );
}

Vue

<script setup lang="ts">
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
</script>

<template>
  <div>
    <Button variant="default" size="lg">Click me</Button>
    <Input placeholder="Enter text..." />
  </div>
</template>

Angular

import { Component } from '@angular/core';
import { ButtonDirective } from '@/components/ui/button';
import { InputComponent } from '@/components/ui/input';

@Component({
  selector: 'app-my-component',
  standalone: true,
  imports: [ButtonDirective, InputComponent],
  template: `
    <div>
      <button hlmBtn variant="default" size="lg">Click me</button>
      <hlm-input placeholder="Enter text..." />
    </div>
  `,
})
export class MyComponent {}

Next.js

'use client';

import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';

export default function MyComponent() {
  return (
    <div>
      <Button variant="default" size="lg">
        Click me
      </Button>
      <Input placeholder="Enter text..." />
    </div>
  );
}

add automatically preserves framework-specific transformations such as 'use client' for Next.js components when needed.

Next.js support is implemented as a React-source target inside the CLI, not as a separate @galaxy-ui/nextjs package.

Nuxt.js

<script setup lang="ts">
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
</script>

<template>
  <div>
    <Button variant="default" size="lg">Click me</Button>
    <Input placeholder="Enter text..." />
  </div>
</template>

Nuxt users should make sure the @/ alias is available in nuxt.config.ts.

Nuxt.js support is implemented as a Vue-source target inside the CLI, not as a separate @galaxy-ui/nuxtjs package.

Configuration

Galaxy UI stores project settings in components.json:

{
  "$schema": "https://galaxy-nebula.vercel.app/schema.json",
  "framework": "react",
  "typescript": true,
  "tailwind": {
    "version": 4,
    "config": "",
    "css": "src/index.css",
    "baseColor": "slate",
    "cssVariables": true,
    "prefix": ""
  },
  "aliases": {
    "components": "@/components",
    "utils": "@/lib/utils",
    "ui": "@/components/ui",
    "lib": "@/lib"
  },
  "iconLibrary": "lucide"
}

Configuration Options

CLI Commands

init

Initialize Galaxy UI in your project and scaffold components.json.

npx @galaxy-stack/nebula-cli@latest init

# Skip prompts (use defaults)
npx @galaxy-stack/nebula-cli@latest init --yes

add

Add registry components to your project.

# Interactive mode
npx @galaxy-stack/nebula-cli@latest add

# Add specific components
npx @galaxy-stack/nebula-cli@latest add button input

# Add all components
npx @galaxy-stack/nebula-cli@latest add --all

There is currently no diff command and no --overwrite option on add.

Styling And Theming

Galaxy UI uses Tailwind CSS with CSS variables for theming. After running init, you can customize colors in your CSS file:

@layer base {
  :root {
    --background: 0 0% 100%;
    --foreground: 222.2 84% 4.9%;
    --primary: 221.2 83.2% 53.3%;
    --primary-foreground: 210 40% 98%;
    /* ... more variables */
  }

  .dark {
    --background: 222.2 84% 4.9%;
    --foreground: 210 40% 98%;
    /* ... dark mode variables */
  }
}

Customization

Components are copied to your project, so you have full control:

1. Modify components - Edit any component in components/ui/
2. Change styles - Update Tailwind classes or CSS variables
3. Add features - Extend components with your own functionality
4. No lock-in - Components are yours to modify

Documentation

• Docs Website: https://galaxy-nebula.vercel.app
• Repository: https://github.com/galaxy-nebula/galaxy-design-cli

Notes

• add currently fetches component source files from GitHub at runtime.
• The CLI now fails explicitly if required files cannot be fetched.
• components.json is the active configuration system. Legacy galaxy.config.* flow has been removed from source.

License

MIT License - see LICENSE for details