Module not found: Can't resolve 'sass-loader'

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Borislav Hadzhiev

Last updated: Mar 20, 2022

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Module not found: Can't resolve 'sass-loader' #

To solve the error "Module not found: Error: Can't resolve 'sass-loader'", make sure to install the package by opening your terminal in your project's root directory and running the command npm install --save-dev sass-loader sass webpack and restart your development server.

Open your terminal in your project's root directory (where your package.json file is located) and run the following commands:

shell
# 👇️ with NPM npm install --save-dev sass-loader sass webpack # 👇️ ONLY If you use TypeScript npm install --save-dev @types/sass-loader @types/sass @types/webpack # ---------------------------------------------- # 👇️ with YARN yarn add sass-loader sass webpack --dev # 👇️ ONLY If you use TypeScript yarn add @types/sass-loader @types/sass @types/webpack --dev

The command will add the sass-loader package to the dependencies of your project.

Make sure to restart your development server and your IDE if necessary. Your dev server won't pick up the changes until you stop it and re-run the npm start command.

The installed packages assume that you use Dart sass.

Now you can import your scss file.

App.js
import "./style.scss";

The imported file may look something like:

style.scss
$body-color: red; body { color: $body-color; }

And your webpack config should look something like:

webpack.config.js
module.exports = { module: { rules: [ { test: /\.s[ac]ss$/i, use: [ // Creates `style` nodes from JS strings "style-loader", // Translates CSS into CommonJS "css-loader", // Compiles Sass to CSS "sass-loader", ], }, ], }, };

If you haven't installed the style-loader and css-loader packages, make sure to do so.

shell
# 👇️ with NPM npm install --save-dev style-loader css-loader # ---------------------------------------------- # 👇️ with YARN yarn add style-loader css-loader --dev

And restart your development server.

For custom config and options, refer to the npm page of the sass-loader package.

If the error is not resolved, try to delete your node_modules and package-lock.json (not package.json) files, re-run npm install and restart your IDE.

shell
# 👇️ delete node_modules and package-lock.json rm -rf node_modules rm -f package-lock.json # 👇️ clean npm cache npm cache clean --force npm install
Make sure to restart your IDE and dev server if the error persists. VSCode often glitches and a reboot solves things sometimes.

If you're still getting the "Module not found: Error: Can't resolve 'sass-loader'" error, open your package.json file and make sure it contains the sass-loader package in the devDependencies object.

package.json
{ // ... rest "devDependencies": { "sass-loader": "^12.6.0", "@types/sass-loader": "^8.0.3", "sass": "^1.49.11", "@types/sass": "^1.43.1", "webpack": "^5.71.0", "@types/webpack": "^5.28.0", "css-loader": "^6.7.1", "style-loader": "^3.3.1" } }

The sass-loader module should NOT be globally installed or be in your project's dependencies, it should be in the devDependencies object in your package.json file.

You can try to manually add the lines and re-run npm install.

shell
npm install

Or install the latest version of the packages:

shell
# 👇️ with NPM npm install --save-dev sass-loader@latest sass@latest webpack@latest npm install --save-dev style-loader@latest css-loader@latest # 👇️ ONLY If you use TypeScript npm install --save-dev @types/sass-loader@latest @types/sass@latest @types/webpack@latest # ---------------------------------------------- # 👇️ with YARN yarn add sass-loader@latest sass@latest webpack@latest --dev yarn add style-loader@latest css-loader@latest --dev # 👇️ ONLY If you use TypeScript yarn add @types/sass-loader@latest @types/sass@latest @types/webpack@latest --dev

Conclusion #

To solve the error "Module not found: Error: Can't resolve 'sass-loader'", make sure to install the package by opening your terminal in your project's root directory and running the command npm install --save-dev sass-loader sass webpack and restart your development server.

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