npm create vite@latest my-shadcn-app -- --template react-ts
cd my-shadcn-app
npm install

npm install -D tailwindcss postcss autoprefixer
npx tailwindcss init -p

import type { Config } from "tailwindcss";

const config: Config = {
  content: ["./index.html", "./src/**/*.{js,ts,jsx,tsx}"],
  theme: {
    extend: {},
  },
  plugins: [],
};

export default config;

@tailwind base;
@tailwind components;
@tailwind utilities;

npm install shadcn@latest
npx shadcn@latest init

npx shadcn@latest add button

import * as React from "react";
import { Slot } from "@radix-ui/react-slot";
import { cva, type VariantProps } from "class-variance-authority";
import { cn } from "@/lib/utils";

const buttonVariants = cva(
  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
  {
    variants: {
      variant: {
        default: "bg-primary text-primary-foreground shadow-xs hover:bg-primary/90",
        destructive: "bg-destructive text-white shadow-xs hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60",
        outline: "border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50",
        secondary: "bg-secondary text-secondary-foreground shadow-xs hover:bg-secondary/80",
        ghost: "hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
        link: "text-primary underline-offset-4 hover:underline",
      },
      size: {
        default: "h-9 px-4 py-2 has-[>svg]:px-3",
        sm: "h-8 rounded-md gap-1.5 px-3 has-[>svg]:px-2.5",
        lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
        icon: "size-9",
      },
    },
    defaultVariants: {
      variant: "default",
      size: "default",
    },
  }
);

function Button({
  className,
  variant,
  size,
  asChild = false,
  ...props
}: React.ComponentProps<"button"> & VariantProps<typeof buttonVariants> & { asChild?: boolean }) {
  const Comp = asChild ? Slot : "button";
  return (
    <Comp
      data-slot="button"
      className={cn(buttonVariants({ variant, size, className }))}
      {...props}
    />
  );
}

export { Button, buttonVariants };

import { Button } from "@/components/ui/button";

function App() {
  return (
    <div className="flex h-screen items-center justify-center bg-gray-100">
      <Button variant="default" onClick={() => alert("Shadcn Button Clicked")}>
        Click Me
      </Button>
    </div>
  );
}

export default App;