Sass with sass-loader

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I just read this awesome article about how cool Sass is. So now, I'm bored with my old, main.css file. Oof. Ancient! Rename this to main.scss. Trendy! Exciting!

Now that this is a Sass file - oooOOOooo - I'll re-work some syntax. Instead of having this extra :hover and :focus section, we can leverage Sass syntax and say &:hover, &:focus, followed by the CSS:

... lines 1 - 14
/*LOGIN*/
.btn-login {
... lines 18 - 26
&:hover,&:focus {
color: #fff;
background-color: #53A3CD;
border-color: #53A3CD;
}
}
... lines 33 - 77

That should, ultimately, dump the same CSS. But now, we have the power of Sass!

Since we renamed the file, in layout.js, we need to change the require to be main.scss:

... lines 1 - 9
require('../css/main.scss');
... lines 11 - 15

Now, what do you think will happen when Webpack sees this import? You can probably guess: it's not going to like it.

Find your webpack terminal. Oh boy... oof, I was right. We have a very familiar error:

Module parse failed. Unexpected token. You may need an appropriate loader to handle this file.

We do have a loader for files ending in .css... but not .scss. Fixing this? Oh, it's so nice.

Adding sass-loader

Google for sass-loader. Let's get this guy installed. This package needs itself - sass-loader - but also another package called node-sass. Copy both of those. Then, in your terminal, run:

yarn add sass-loader@^6.0 node-sass --dev

Next, in webpack.config.js, we just need to setup our .scss loader. Copy the CSS loader and paste it. Then... this is cool... just add sass-loader as a third loader. Oh, and don't forget to update test for .scss files:

... lines 1 - 4
module.exports = {
... lines 6 - 15
module: {
rules: [
... lines 18 - 27
{
test: /\.css$/,
... lines 30 - 33
},
{
test: /\.scss$/,
use: [
'style-loader',
'css-loader',
'sass-loader',
]
},
... lines 43 - 64
]
},
... lines 67 - 77
};

I love this: sass-loader will be called first, which will convert the SASS into CSS. Then, css-loader will convert that to a JavaScript object. Finally, style-loader will add the CSS to the page. That's team work people!

Switch over to your Webpack tab, hit Control+C and restart webpack:

./node_modules/.bin/webpack --watch

No errors! Try the site. It looks great.

Guys! In just a few lines of code, we've unlocked the power of Sass. Use it wherever you want. Like Less instead? It's just as easy to setup.

Leave a comment!

  • 2019-09-09 weaverryan

    Hey David Wilson!

    Thanks for the note! Indeed, it looks like a new version of sass-loader (version 8, released about 10 days ago) is not compat with the version of Webpack used in this tutorial. So, you were right to grab the same version as the tutorial :). I've updated the terminal block about this and we'll add a note to the video.

    Cheers!

  • 2019-09-07 David Wilson

    I was getting:

    ERROR in ./node_modules/css-loader!./node_modules/sass-loader/dist/cjs.js!./assets/css/main.scss
    Module build failed: TypeError: this.getResolve is not a function
    at Object.loader (/home/dave/projects/webpack/node_modules/sass-loader/dist/index.js:52:26)
    @ ./assets/css/main.scss 1:14-120
    @ ./assets/js/layout.js

    I looked in the finish folder to install the specific versions of the sass libraries:

    "node-sass": "4.5.3",
    "sass-loader": "^6.0.6",

    I also had to install g++ as it had to build node-sass from source

  • 2019-05-06 weaverryan

    Hey @lautrecestmoi!

    Yep! You definitely need to explicitly require both libraries :).

    Cheers!

  • 2019-04-30 lautrecestmoi

    Don't forget to install node-sass if you d'ont get it:
    npm i node-sass
    ;)