sass-module-importer fails to import include-media

[franekp]

When using include-media installed by yarn, index.js is imported instead of proper .scss file.
console output for a sass file that begins with "@import include-media":

yarn sass
yarn sass v0.16.1
$ gulp sass 
[14:10:08] Using gulpfile ~/.../gulpfile.js
[14:10:08] Starting 'sass'...
[14:10:08] gulp-notify: [Sass error] Error in plugin 'gulp-sass'
Message:
    node_modules/include-media/index.js
Error: Invalid CSS after "v": expected 1 selector or at-rule, was "var path = require("
        on line 1 of node_modules/include-media/index.js
>> var path = require('path');
   ^

Details:
    status: 1
    file: /home/.../node_modules/include-media/index.js
    line: 1
    column: 1
    formatted: Error: Invalid CSS after "v": expected 1 selector or at-rule, was "var path = require("
        on line 1 of node_modules/include-media/index.js
>> var path = require('path');