gulpfile-demo.js

///////////////////////
// Requires
///////////////////////

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

///////////////////////
// Tasks
///////////////////////

gulp.task('uglify', function() {
  gulp.src('src/js/**/*.js')
    .pipe(uglify())
    .pipe(gulp.dest('public/js'))
});

gulp.task('uglify:watch', function() {
  gulp.watch('src/js/**/*.js', ['uglify']);
});

gulp.task('sass', function() {
  gulp.src('src/sass/**/*.scss')
    .pipe(sass())
    .pipe(gulp.dest('public/css'))
});

gulp.task('sass:watch', function() {
  gulp.watch('src/sass/**/*.scss', ['sass']);
});

//////////////////////////////
// Running Tasks
//////////////////////////////

gulp.task('build', ['uglify', 'sass']);

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

gulp.task('default', ['build', 'watch']);