gulp.task('sass', function () {
  return gulp.src('./assets/sass/*.scss')
   .pipe(sourcemaps.init())
   .pipe(sass({outputStyle: 'compressed'}).on('error', sass.logError))
   .pipe(rename({suffix: '.min'}))
   .pipe(sourcemaps.write('/'))
   .pipe(gulp.dest('./public/css'));
});

/node_modules/datatables.net-dt/css/jquery.dataTables.min.css

assets/sass/private.scss (contains @import "pages/private/dt_styles")
assets/sass/pages/private/dt_styles.scss (contains @import "../../../../node_modules/datatables.net-dt/css/jquery.dataTables.min.css";)

public/css/dt_styles.css

@import url(../../../../node_modules/datatables.net-dt/css/jquery.dataTables.min.css)

/*# sourceMappingURL=private.min.css.map */