Gulp import partials

temple:/data/disk/o1/static/z-themes/csstricks# ls
css/  gulpfile.js  node_modules/  package.json  sass/
temple:/data/disk/o1/static/z-themes/csstricks# ls node_modules
gulp/  gulp-sass/  node-sass-globbing/
temple:/data/disk/o1/static/z-themes/csstricks# cat gulpfile.js
'use strict';

var gulp = require('gulp');
var sass = require('gulp-sass');
var importer = require('node-sass-globbing');

gulp.task('sass', function(){
  return gulp.src('sass/**/*.scss') //source = any file with a .scss extension in /sass or a child directory.
    .pipe(sass()) // Converts Sass to CSS with gulp-sass
    .pipe(gulp.dest('css')) //destination
});
temple:/data/disk/o1/static/z-themes/csstricks# cat sass/styles.scss
// import sass partials
@import "variables/**/*.scss";
@import "sass/components/test";

temple:/data/disk/o1/static/z-themes/csstricks# ls sass/variables
_colors.scss
temple:/data/disk/o1/static/z-themes/csstricks# gulp sass
[09:40:24] Using gulpfile /data/disk/o1/static/z-themes/csstricks/gulpfile.js
[09:40:24] Starting 'sass'...

events.js:141
      throw er; // Unhandled 'error' event
      ^
Error: sass/styles.scss
Error: File to import not found or unreadable: variables/**/*.scss
       Parent style sheet: /data/disk/o1/static/z-themes/csstricks/sass/styles.scss
        on line 2 of sass/styles.scss
>> @import "variables/**/*.scss";
   ^

    at options.error (/data/disk/o1/static/z-themes/csstricks/node_modules/gulp-sass/node_modules/node-sass/lib/index.js:271:32)
temple:/data/disk/o1/static/z-themes/csstricks#