Frontend UI Components

This skill outlines how to build and use UI components in the frontend applications, leveraging the shared @eridu/ui package and Shadcn patterns.

The @eridu/ui Package

All generic UI components (Buttons, Inputs, Dialogs, etc.) live in packages/ui. Do NOT create local copies of generic components in apps.

Usage

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

export function MyForm() {
  return (
    <div className="flex gap-4">
      <Input placeholder="Search..." />
      <Button variant="default">Search</Button>
    </div>
  );
}

Styling Pattern (Tailwind CSS v4)

We use Tailwind CSS v4 with clsx and tailwind-merge for conditional styling.

The cn Utility

Use the cn utility from @eridu/ui/lib/utils to merge classes safely.

import { cn } from '@eridu/ui/lib/utils';

interface CardProps {
  className?: string;
  children: React.ReactNode;
}

export function Card({ className, children }: CardProps) {
  return (
    <div className={cn("rounded-lg border bg-card text-card-foreground shadow-sm", className)}>
      {children}
    </div>
  );
}

Creating New Components

When creating app-specific features:

1. •Compose them using primitives from @eridu/ui.
2. •Keep them in src/components/{feature-name}/.

When creating new generic primitives:

1. •Add them to packages/ui/src/components/.
2. •Follow the Radix UI + Tailwind pattern (Shadcn style).
3. •Export them via packages/ui/package.json.

Checklist

• • Import generic components from @eridu/ui.
• • Use cn() for class merging.
• • Ensure components are accessible (Radix UI primitives).
• • Use Tailwind text/bg colors that map to the theme (e.g., bg-primary, text-muted-foreground).