Gulp JS SASS

gulpfile.js

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

var input = './scss/**/*.scss',
	output = './css';

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

gulp.task('watch', function() {
  return gulp
    .watch(input, ['sass'])
    .on('change', function(event) {
    });
});

gulp.task('run', ['watch', 'sass']);