[import] When using SASS how can I import a file from a different directory?

node-sass (the official SASS wrapper for node.js) provides a command line option --include-path to help with such requirements.

Example:

In package.json:

"scripts": {
    "build-css": "node-sass src/ -o src/ --include-path src/",
}

Now, if you have a file src/styles/common.scss in your project, you can import it with @import 'styles/common'; anywhere in your project.

Refer https://github.com/sass/node-sass#usage-1 for more details.