Error: 'node-sass' version 5.0.0 is incompatible with ^4.0.0

I've created a blank React project, using the command: npx create-react-app on npm v7.0.7 and Node.js v15.0.1

Installed:

• React v17.0.1,
• node-sass v5.0.0,

Then I tried to import a blank .scss file to the App component:

File App.js

import './App.scss'

function App() {
  return (
    <div className="App">
      App
    </div>
  );
}

export default App;

It throws an error:

Failed to compile.

./src/App.scss (./node_modules/css-loader/dist/cjs.js??ref--5-oneOf-6-1!./node_modules/postcss-loader/src??postcss!./node_modules/resolve-url-loader??ref--5-oneOf-6-3!./node_modules/s
ass-loader/dist/cjs.js??ref--5-oneOf-6-4!./src/App.scss)
Error: Node Sass version 5.0.0 is incompatible with ^4.0.0.

File package.json

{
  "name": "react-17-node-sass-5",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.11.5",
    "@testing-library/react": "^11.1.0",
    "@testing-library/user-event": "^12.1.10",
    "node-sass": "^5.0.0",
    "react": "^17.0.1",
    "react-dom": "^17.0.1",
    "react-scripts": "4.0.0",
    "web-vitals": "^0.2.4"
  },
 ...

  }
}

TL;DR

1. npm uninstall node-sass
2. npm install sass

Or, if using Yarn

1. yarn remove node-sass
2. yarn add sass

Edit3: yes, another edit. Moving to sass (dart-sass) is the best solution. Previous one included locking node-sass to version 4.x.x, which is 2 years old and lacks newer SCSS features.

Edit2: sass-loader v10.0.5 fixes it. The problem is you might not be using it as a project dependency, but more as a dependency of your dependencies. CRA uses a fixed version, angular-cli locks to node-sass v4, and so on.

The recommendation for now is: if you're installing just node-sass, check the below workaround (and the note). If you're working on a blank project and you can manage your Webpack configuration (not using CRA or a CLI to scaffold your project), install the latest sass-loader.

Edit: this error comes from sass-loader. There is a semantic versioning mismatch since node-sass @latest is v5.0.0 and sass-loader expects ^4.0.0.

There is an open issue on their repository with an associated fix that needs to be reviewed. Until then, refer to the solution below.

Workaround: don't install node-sass 5.0.0 yet (the major version was just bumped).

Uninstall node-sass

npm uninstall node-sass

Then install the latest version (before 5.0)

npm install [email protected]

Note: LibSass (hence node-sass as well) is deprecated and dart-sass is the recommended implementation. You can use sass instead, which is a Node.js distribution of dart-sass compiled to pure JavaScript.

The only one reason why you get some error like that, is because your Node.js version is not compatible with your node-sass version.

So, make sure to checkout the documentation at node-sass.

Or this image below will be help you in deciding what Node.js version can use the node-sass version.

For an example, if you're using Node.js version 12 on your Windows system ("maybe"), then you should have to install the node-sass version 4.12.

npm install [email protected]

Yeah, like that. So now you only need to install the node-sass version recommended by the node-sass team with Node.js version installed on your computer.

Uninstall node-sass:

npm uninstall node-sass

Use sass by:

npm install -g sass
npm install --save-dev sass