You'll need to make use of the "import-path" option to do this, where the path you're importing contains the fallback files you want to import (in our case, we want an empty file).
Option 1: Vanilla Sass
File structure
├── fallback
├── _example.scss // <-- our blank file
├── _example.scss // <-- the file for the user to customize (optional)
├── style.scss
In style.scss:
@import "example";
/* the rest of our styles */
When you run your sass command, you would write it like this:
sass --watch ./css:./sass --load-path ./sass/fallback
Note that the fallback directory does not have to be inside your sass directory, it be anywhere on the filesystem you like.
See also: How does SCSS locate partials?
Option 2: Compass Extension
You may find that creating a Compass extension is a little more convenient if you're using this technique in multiple projects. It will automatically setup the load-path for you. You can learn more about creating extensions here: http://compass-style.org/help/tutorials/extensions/
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