How to implement SASS into react with raw webpack? - reactjs

Question

So I was trying to use Bulma and got a can't import _varibales.sass, which I have in my src folder. So I thought it was because I didn't configure webpack to support Sass.
So I followed the configuration instructions from this tutorial, but then I got a loader error. This is my first time using raw webpack as opposed to CRA. I did this because I wanted to understand Webpack and Babel more.
Another thing I have tried is the Webpack configuration found on the dart-sass configuration.
My error right now is:
[webpack-cli] Invalid configuration object. Webpack has been initialized using a configuration object that does not match the API schema.
configuration.module.rules[2] should be one of these:
["..." | object { compiler?, dependency?, descriptionData?, enforce?, exclude?, generator?, include?, issuer?, issuerLayer?, layer?, loader?, mimetype?, oneOf?, options?, parser?, realResource?, resolve?, resource?, resourceFragment?, resourceQuery?, rules?, sideEffects?, test?, type?, use? }, ...]
-> A rule.
Details:
* configuration.module.rules[2].loader should be a non-empty string.
And my webpack.config.js looks like this:
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const Dotenv = require('dotenv-webpack');
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const isDevelopment = process.env.NODE_ENV === 'development'
module.exports = {
mode: 'development',
entry: path.resolve(__dirname, 'src', 'index.js'),
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'bundle.js',
publicPath: '/'
},
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: 'babel-loader',
options: {
presets: ["#babel/preset-env", "#babel/preset-react"]
}
},
{
test: /\.module\.s(a|c)ss$/,
loader: [
isDevelopment ? 'style-loader' : MiniCssExtractPlugin.loader,
{
loader: 'css-loader',
options: {
modules: true,
sourceMap: isDevelopment
}
},
{
loader: 'sass-loader',
options: {
sourceMap: isDevelopment
}
}
]
},
{
test: /\.s(a|c)ss$/,
exclude: /\.module.(s(a|c)ss)$/,
loader: [
isDevelopment ? 'style-loader' : MiniCssExtractPlugin.loader,
'css-loader',
{
loader: 'sass-loader',
options: {
sourceMap: isDevelopment
}
}
]
}
]
},
devServer: {
historyApiFallback: true,
},
plugins: [
new HtmlWebpackPlugin({ template: path.resolve(__dirname, 'src', 'index.html') }),
new Dotenv(),
new MiniCssExtractPlugin({
filename: isDevelopment ? '[name.css]' : '[name].[hash].css',
chunkFilename: isDevelopment ? '[id].css' : '[id].[hash].css'
})
],
resolve: {
extensions: [".js", ".jsx", ".sass", ".scss"]
}
};

Answer 1

You use WebPack version 5+. Downgrade to a lower version of WebPack to assure compatibility.
"webpack": "^4.41.5"
In case you need to stick with the 5+ version or to learn more about the error in the webpack.config.json configuration file, refer to Webpack v4 to v5 migration.

Answer 2

Actuall, I had the same issue which draw me back to this question and I found the answer here (downgrading was not working as too many dependencies...) : https://webpack.js.org/loaders/sass-loader/
Instead of loader, it's 'use' that need to be used, like:
{
test: /\.s(a|c)ss$/,
use: ['style-loader','css-loader', 'sass-loader'
},