🐻 Kuma UI is a utility-first, zero-runtime CSS-in-JS library that offers an outstanding developer experience and optimized performance.

🔥   Blazing-fast performance with zero-runtime CSS extraction

🦄   Build-time CSS generation

🌳   Responsive design with breakpoints and media queries

🎨   Utility-first approach for rapid UI development

👋   Support for pseudo-classes and pseudo-elements

🔬   Experimental support for Next.js 13.4 App router & React server components(RSC).

npm install @kuma-ui/core

or

yarn add @kuma-ui/core

The k object is a key part of Kuma UI's API. It provides pre-styled HTML elements that you can use as components in your application. These elements can be styled using utility props for inline styling. The utility props are type-safe and make it easy to write responsive styles.

import { k } from "@kuma-ui/core";

function App() {
  return (
    <k.div p={[4, 8]} m="2px" _hover={{ flexDir: "row" }}>
      hello world
    </k.div>
  );
}

The css function is another way to style your components. It takes an object of styles and returns a string of hashed classNames that you can apply to your component using the className prop.

import { css } from "@kuma-ui/core";

const styles = css({ color: 'red', fontSize: '24px' });

function App() {
  return <div className={styles}>Hello, world!</div>;
}

yarn add @kuma-ui/next-plugin

next.config.js

const { withKumaUI } = require("@kuma-ui/next-plugin");

/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,
};

module.exports = withKumaUI(nextConfig);

next.config.js

const { withKumaUI } = require("@kuma-ui/next-plugin");

/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,
  experimental: {
    appDir: true
  }
};

module.exports = withKumaUI(nextConfig);

Please note that as of now, App Router is an experimental feature. A .kuma directory will be produced in the process, which should be added to your .gitignore file. If you delete the .kuma directory, make sure to also clear the .next cache.

yarn add @kuma-ui/vite

vite.config.ts

import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
import KumaUI from "@kuma-ui/vite";

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    react({
      jsxRuntime: "classic",
    }),
    KumaUI(),
  ],
});

Kuma UI supports responsive design. Use arrays to specify different styles for different viewport widths. For example, <k.div fontSize={[16, 24]} /> changes the font size from 16px to 24px based on the window size.

Define the breakpoints in your config file:

import kumaUI from "@kuma-ui/vite";

kumaUI({
  breakpoints: { sm: "400px", md: "700px" },
});

Contributions are welcome! Please feel free to submit issues or pull requests with any improvements or suggestions.

MIT