npm install -g scss-compile
NOTE - make sure you have NODE JS on your system.
Once successful, you will see:
Now you are ready to use a command line to compile a SCSS file into a CSS file. Assume we have this HTML in a directory named SampleProject.
HTML File
<html>
<head>
    <link rel="stylesheet" type="text/css" href="css/style.css">
    </head>    
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
SCSS file
Under the SampleProject folder, we have a folder named css.  In this folder , there is a file named style.scss, as shown here: 
The following code represents the style.scss file. 
$font-stack:    Helvetica, sans-serif;
$primary-color: #333;
body {
  font: 100% $font-stack;
  color: $primary-color;
}
Compile the SCSS into a CSS
To compile this SCSS into a CSS file using NPM, you need to create a file named package.json in the SampleProject folder. This package defines the command we need to convert this file. Here is the code for this JSON file. 
{
  "devDependencies": {
    "node-sass": "^6.4.1"
  },
  "scripts": {
    "scss-compile": "node-sass -o css css/style.scss"
  }
}
Now open the command line to the  SampleProject folder and enter this command: 
 npm run scss-compile
If successful, you will see this message in the command prompt. 
There you go, now you have successfully converted the SCSS into a CSS file. 
Hope this helps.



