That's because you are not using Dart Sass which supports this feature.

Also in the documentation you will find:

Only Dart Sass currently supports @use. Users of other implementations must use the @import rule instead.

So use @import until @use is supported.

BTW, If you want to use Dart Sass, just use sass instead of node-sass and require it in the webpack config, like:

// ...
{
  loader: 'sass-loader',
  options: {
    implementation: require('sass')
  }
}
// ...

This is a very important update to the accepted answer by @llobert. After hours of searching, it turns out node-sass relies on libsass which is the C++ implementation of sass. According the docs for the libsass repository this C++ implementation has been deprecated.

Okay, so you may think, as easy as installing dart-sass, however you will find the docs have fallen behind here as well. If you go to dart-sass on npm you'll find:

So what you have to do now is:

npm install sass

And just in case, like myself, the reader of this is researching the whole sass affair because they are using gulp-sass:

At the bottom of the gulp-sass npm page you will find this tid bit.

Ah, what do you know. The default hasn't changed, but the underlying libsass libary has fallen behind due to depreciation. Thus you must add this to your gulp file:

var sass = require('gulp-sass');
sass.compiler = require('sass');

So long story short, there are some changes going on in the SASS world that have been drastic, but yet seemingly happened very quietly. I hope this recount of my last few hours will save some future devs a lot of time searching till the docs get sorted out.

Short Answer

You can access variables, functions, and mixins from another module by writing < namespace >.< variable >, < namespace >.< function>()>, or @include < namespace >.< mixin >(). By default, the namespace is just the last component of the module’s URL.

That means by using variables.$font-text

global.scss

@use '_variables';

body {
  font-family: variables.$font-text;
}

SASS Documentation on Loading Members

Long Answer

So the answer or @llobet was using webpack and the answer of @Jamie Marshall was using gulp file, but I was trying to use SASS using Node JS and needed a step by step guide to make it work.

Here is how I made @use work - Step by step guide using Dart Sass with Node JS.

1. Create New Node Project

npm init

2. Install Dart SASS

npm i sass

Optionally you can also install AutoPrefixer using npm install postcss-cli autoprefixer

3. Configure NPM Script to Compile SASS

In Package.json, add script compile:sass to compile sass to css

"scripts": {
   "test": "echo \"Error: no test specified\" && exit 1",
   "compile:sass": "sass --watch scss:assets/css"
},

4. Create SCSS folder and inside it create style.scss file

Above script compile:sass expects a folder called scss on the root of the project and a .scss file inside that folder

Paste the following inside .scss file

@use '_variables';

body {
font-family: variables.$font-text;
}

5. Create Partial file _variables.scss

Create a partial file named _variables.scss on the same directory scss and paste the following code in it

$font-text: 'lato', sans-serif;

6. Compile SASS to CSS

Run the following script inside your project's root folder to compile SASS to CSS

npm run compile:sass

Now you would see a folder named assets and inside it there would be a folder named css and inside it your css file would be compiled.