Gulp JS SASS

gulpfile.js

var gulp = require('gulp');
var sass = require('gulp-sass');
var sourcemaps = require('gulp-sourcemaps');

var input = './wp-content/themes/ro/library/scss/**/*.scss';
var output = './wp-content/themes/ro/library/css';

gulp.task('sass', function () {
  return gulp.src(input)
    .pipe(sourcemaps.init())
    .pipe(sass({outputStyle: 'compressed'}))
    .pipe(sourcemaps.write())
    .pipe(gulp.dest(output));
});

var sassOptions = {
  errLogToConsole: true,
  outputStyle: 'expanded'
};