Gulpfile.js

var gulp         = require('gulp'),
    sass         = require('gulp-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    concatCss    = require('gulp-concat-css'),
    CleanCSS     = require('clean-css'),
    map          = require('vinyl-map'),
    concatJs     = require('gulp-concat'),
    uglify       = require('gulp-uglify');

gulp.task('sass', function () {
  var minify = map(function (buff, filename) {
    return new CleanCSS({
    }).minify(buff.toString()).styles;
  });

  return gulp.src('./content/themes/pucara/lib/stylesheets/components.sass')
    .pipe(sass({optionStyle: "compressed"}).on('error', sass.logError))
    .pipe(concatCss('components.css'))
    .pipe(autoprefixer({
      cascade: true
    }))
    .pipe(minify)
    .pipe(gulp.dest('./content/themes/pucara/assets/css/'));
});


gulp.task('minify:js', function() {
  return gulp.src('./content/themes/pucara/lib/js/*.js')
    .pipe(uglify())
    .pipe(concatJs('app.js'))
    .pipe(gulp.dest('./content/themes/pucara/assets/js/min/'));
});

gulp.task('run:developing', function () {
  gulp.watch('./content/themes/pucara/lib/stylesheets/**/**/**/*.sass', ['sass']);
  gulp.watch('./content/themes/pucara/lib/js/*.js', ['minify:js']);
});