Shadcn Tailwind Patterns

shadcn/ui + Tailwind CSS Patterns

Tailwind Config

// tailwind.config.ts
import type { Config } from 'tailwindcss'
import { fontFamily } from 'tailwindcss/defaultTheme'

export default {
  darkMode: ['class'],
  content: ['./src/**/*.{ts,tsx}', './components/**/*.{ts,tsx}'],
  theme: {
    extend: {
      colors: {
        border:      'hsl(var(--border))',
        input:       'hsl(var(--input))',
        ring:        'hsl(var(--ring))',
        background:  'hsl(var(--background))',
        foreground:  'hsl(var(--foreground))',
        primary: {
          DEFAULT:    'hsl(var(--primary))',
          foreground: 'hsl(var(--primary-foreground))',
        },
        destructive: {
          DEFAULT:    'hsl(var(--destructive))',
          foreground: 'hsl(var(--destructive-foreground))',
        },
      },
      borderRadius: {
        lg: 'var(--radius)',
        md: 'calc(var(--radius) - 2px)',
        sm: 'calc(var(--radius) - 4px)',
      },
      fontFamily: {
        sans: ['var(--font-sans)', ...fontFamily.sans],
      },
    },
  },
  plugins: [require('tailwindcss-animate')],
} satisfies Config

cn Utility

// lib/utils.ts
import { clsx, type ClassValue } from 'clsx'
import { twMerge } from 'tailwind-merge'

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

CVA Component Variants

import { cva, type VariantProps } from 'class-variance-authority'

const buttonVariants = cva(
  // base classes
  'inline-flex items-center justify-center gap-2 rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50',
  {
    variants: {
      variant: {
        default:     'bg-primary text-primary-foreground hover:bg-primary/90',
        destructive: 'bg-destructive text-destructive-foreground hover:bg-destructive/90',
        outline:     'border border-input bg-background hover:bg-accent hover:text-accent-foreground',
        ghost:       'hover:bg-accent hover:text-accent-foreground',
        link:        'text-primary underline-offset-4 hover:underline',
      },
      size: {
        default: 'h-10 px-4 py-2',
        sm:      'h-9 rounded-md px-3',
        lg:      'h-11 rounded-md px-8',
        icon:    'h-10 w-10',
      },
    },
    defaultVariants: {
      variant: 'default',
      size: 'default',
    },
  }
)

interface ButtonProps
  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
    VariantProps<typeof buttonVariants> {
  asChild?: boolean
}

const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant, size, asChild = false, ...props }, ref) => {
    const Comp = asChild ? Slot : 'button'
    return (
      <Comp className={cn(buttonVariants({ variant, size, className }))} ref={ref} {...props} />
    )
  }
)
Button.displayName = 'Button'

export { Button, buttonVariants }

shadcn/ui Form Pattern

import { Form, FormControl, FormField, FormItem, FormLabel, FormMessage } from '@/components/ui/form'
import { Input } from '@/components/ui/input'
import { Button } from '@/components/ui/button'
import { useForm } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'
import { z } from 'zod'

const formSchema = z.object({
  email:    z.string().email('Invalid email'),
  password: z.string().min(8, 'Minimum 8 characters'),
})

type FormValues = z.infer<typeof formSchema>

function LoginForm({ onSubmit }: { onSubmit: (v: FormValues) => void }) {
  const form = useForm<FormValues>({ resolver: zodResolver(formSchema) })

  return (
    <Form {...form}>
      <form className="space-y-4">
        <FormField
          control={form.control}
          name="email"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Email</FormLabel>
              <FormControl>
                <Input placeholder="you@example.com" type="email" {...field} />
              </FormControl>
              <FormMessage />
            </FormItem>
          )}
        />
        <FormField
          control={form.control}
          name="password"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Password</FormLabel>
              <FormControl>
                <Input type="password" {...field} />
              </FormControl>
              <FormMessage />
            </FormItem>
          )}
        />
        <Button type="submit" className="w-full" disabled={form.formState.isSubmitting}>
          {form.formState.isSubmitting ? 'Logging in...' : 'Log in'}
        </Button>
      </form>
    </Form>
  )
}

Data Table Pattern (shadcn/ui + TanStack Table)

import { useReactTable, getCoreRowModel, flexRender, type ColumnDef } from '@tanstack/react-table'
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from '@/components/ui/table'

function DataTable<TData>({ columns, data }: { columns: ColumnDef<TData>[]; data: TData[] }) {
  const table = useReactTable({ data, columns, getCoreRowModel: getCoreRowModel() })

  return (
    <div className="rounded-md border">
      <Table>
        <TableHeader>
          {table.getHeaderGroups().map(hg => (
            <TableRow key={hg.id}>
              {hg.headers.map(h => (
                <TableHead key={h.id}>
                  {h.isPlaceholder ? null : flexRender(h.column.columnDef.header, h.getContext())}
                </TableHead>
              ))}
            </TableRow>
          ))}
        </TableHeader>
        <TableBody>
          {table.getRowModel().rows.length ? (
            table.getRowModel().rows.map(row => (
              <TableRow key={row.id} data-state={row.getIsSelected() ? 'selected' : undefined}>
                {row.getVisibleCells().map(cell => (
                  <TableCell key={cell.id}>
                    {flexRender(cell.column.columnDef.cell, cell.getContext())}
                  </TableCell>
                ))}
              </TableRow>
            ))
          ) : (
            <TableRow>
              <TableCell colSpan={columns.length} className="h-24 text-center">No results.</TableCell>
            </TableRow>
          )}
        </TableBody>
      </Table>
    </div>
  )
}