{"id":17822,"library":"muicss","title":"MUI CSS Framework","description":"MUI is a lightweight CSS framework and React component library designed to implement Google's Material Design guidelines. The current stable version, 0.10.3, was last published over five years ago, indicating that the project is no longer actively maintained. It differentiates itself by offering a small footprint (6.6KB CSS, 5.4KB JS gzipped), a responsive grid, and no external JavaScript dependencies for its core library. It also provides a separate library for styling HTML emails. While it aims for developer-friendliness and customization via SASS, its lack of recent updates means it does not support modern JavaScript or React ecosystem practices and versions.","status":"abandoned","version":"0.10.3","language":"javascript","source_language":"en","source_url":"https://github.com/muicss/mui","tags":["javascript","MUI","CSS","CSS Framework","Material Design","React"],"install":[{"cmd":"npm install muicss","lang":"bash","label":"npm"},{"cmd":"yarn add muicss","lang":"bash","label":"yarn"},{"cmd":"pnpm add muicss","lang":"bash","label":"pnpm"}],"dependencies":[{"reason":"Peer dependency for the React component library, specifying older React versions.","package":"react","optional":false}],"imports":[{"note":"This provides all MUI React components via a single entry point, suitable for most modern bundlers, though ESM is recommended.","wrong":"const { Appbar } = require('muicss/react');","symbol":"{ Appbar, Button, Panel }","correct":"import { Appbar, Button, Panel } from 'muicss/react';"},{"note":"Recommended for optimizing bundle size by importing only necessary components, as individual components are default exports from their specific paths.","wrong":"import { Appbar } from 'muicss/lib/react/appbar';","symbol":"Appbar (individual component)","correct":"import Appbar from 'muicss/lib/react/appbar';"},{"note":"Essential for applying the Material Design styling. This must be imported somewhere in the application's entry point or linked in the HTML.","wrong":"require('muicss/dist/css/mui.min.css');","symbol":"MUI CSS Styles","correct":"import 'muicss/dist/css/mui.min.css';"}],"quickstart":{"code":"import React from 'react';\nimport ReactDOM from 'react-dom';\nimport { Appbar, Button, Panel, Container } from 'muicss/react';\nimport 'muicss/dist/css/mui.min.css'; // Don't forget to import the CSS!\n\nclass Example extends React.Component {\n  onClick() {\n    console.log('clicked on button');\n  }\n  \n  render() {\n    return (\n      <div>\n        <Appbar title=\"MUI Example App\" />\n        <Container>\n          <Panel>\n            <h1>Welcome to MUI</h1>\n            <p>This is a basic example using MUI React components.</p>\n            <Button onClick={this.onClick} color=\"primary\">My Button</Button>\n          </Panel>\n        </Container>\n      </div>\n    );\n  }\n}\n\n// Ensure a div with id='example' exists in your HTML\nReactDOM.render(<Example />, document.getElementById('example'));","lang":"javascript","description":"This quickstart demonstrates how to render a simple React application using `muicss` components like `Appbar`, `Container`, `Panel`, and `Button`, including the essential CSS import for styling."},"warnings":[{"fix":"Consider migrating to actively maintained Material Design libraries like `@mui/material` (formerly Material-UI) or `React-Bootstrap` for modern React compatibility and features.","message":"This package is effectively abandoned and has not been updated in over 5 years. It is incompatible with modern React versions (v17+) and newer JavaScript/TypeScript tooling.","severity":"breaking","affected_versions":">=0.10.3"},{"fix":"Verify you are installing the correct package. If you intend to use the modern Material UI library, install `@mui/material` via `npm install @mui/material`.","message":"This `muicss` package is often confused with the actively developed `@mui/material` (formerly Material-UI) library. They are distinct projects, and `muicss` is unmaintained.","severity":"gotcha","affected_versions":">=0.1.0"},{"fix":"Downgrade your React version to `^16.0.0` or earlier, or migrate your project to a different, actively maintained Material Design library that supports your current React version.","message":"The `muicss` package's peer dependency `react` is limited to versions `^0.14.0 || ^15.0.0 || ^16.0.0`. Using `muicss` with React 17 or later will lead to peer dependency installation errors and potential runtime issues.","severity":"breaking","affected_versions":">=0.10.3"},{"fix":"There is no direct fix within `muicss` itself. This highlights the project's outdated nature. Migration to a modern library is recommended.","message":"The `muicss` React component library uses `react-addons-shallow-compare`, which has been deprecated since React v15.5.","severity":"deprecated","affected_versions":">=0.10.3"}],"env_vars":null,"last_verified":"2026-04-23T00:00:00.000Z","next_check":"2026-07-22T00:00:00.000Z","problems":[{"fix":"Either downgrade your project's React version to 16.x (`npm install react@16 react-dom@16` or `yarn add react@16 react-dom@16`) or choose a different, actively maintained Material Design UI library compatible with modern React.","cause":"Attempting to install or use `muicss` in a project that requires or has React v17 or newer, which conflicts with `muicss`'s outdated peer dependency requirements.","error":"npm ERR! Could not resolve dependency: npm ERR! peer react@\"^17.0.0\" from muicss@0.10.3"},{"fix":"Ensure that `import 'muicss/dist/css/mui.min.css';` is included in your main application entry file (e.g., `index.js` or `App.js`), or that the CSS file is linked directly in your `index.html` via a `<link>` tag pointing to the correct path (e.g., from a CDN or your `node_modules`).","cause":"The essential `mui.min.css` stylesheet for the `muicss` framework has not been correctly imported or linked in your application, leading to unstyled components.","error":"MUI components appear unstyled. (e.g., 'Button has no style in it')"}],"ecosystem":"npm","meta_description":null,"install_score":null,"install_tag":null,"quickstart_score":null,"quickstart_tag":null}