A simple and standard setup of Gulp

standard-gulp-setup

// filemane: gulpfile.js
// ruby must be installed, then run gem install sass
// npm install gulp-ruby-sass gulp-autoprefixer gulp-cssnano gulp-jshint gulp-concat gulp-uglify gulp-imagemin gulp-notify gulp-rename gulp-livereload gulp-cache del gulp-babel babel-preset-env --save-dev
// also need to get jshint to work: .jshintrc


/*
UPDATE: without ruby: https://github.com/dlmanning/gulp-sass
ex: 

'use strict';

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

gulp.task('sass', function () {
  return gulp.src('./sass/**/*.scss')
    .pipe(sass().on('error', sass.logError))
    .pipe(gulp.dest('./css'));
});

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

*/


var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    cssnano = require('gulp-cssnano'),
    jshint = require('gulp-jshint'),
    uglify = require('gulp-uglify'),
    imagemin = require('gulp-imagemin'),
    rename = require('gulp-rename'),
    concat = require('gulp-concat'),
    notify = require('gulp-notify'),
    cache = require('gulp-cache'),
    livereload = require('gulp-livereload'),
    del = require('del'),
    babel = require('gulp-babel'),
    sourcemaps = require('gulp-sourcemaps'),
    browserify = require('gulp-browserify');

gulp.task('styles', function() {
  return sass('css/main.scss', { style: 'expanded' })
    .pipe(sourcemaps.init())
    .pipe(autoprefixer('last 2 version'))
    .pipe(sourcemaps.write('.'))
    .pipe(gulp.dest('dist/assets/css'))
    .pipe(rename({suffix: '.min'}))
    .pipe(cssnano())
    .pipe(gulp.dest('dist/assets/css'))
    .pipe(notify({ message: 'Styles task complete' }));
});

// Scripts
gulp.task('scripts', function() {
  return gulp.src('js//**/*.js')
    .pipe(sourcemaps.init())
  	.pipe(babel({
  		presets: ['env']
  	}))
    //.pipe(jshint('.jshintrc'))
    //.pipe(jshint.reporter('default'))
    .pipe(browserify())
    .pipe(concat('main.js'))
    .pipe(sourcemaps.write())
    .pipe(gulp.dest('dist/scripts'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(uglify())
    .pipe(gulp.dest('dist/scripts'))
    .pipe(notify({ message: 'Scripts task complete' }));
});

// Images
gulp.task('images', function() {
  return gulp.src('src/images/**/*')
    .pipe(cache(imagemin({ optimizationLevel: 3, progressive: true, interlaced: true })))
    .pipe(gulp.dest('dist/images'))
    .pipe(notify({ message: 'Images task complete' }));
});

// clean
gulp.task('clean', function() {
    return del(['dist/assets/css', 'dist/assets/js', 'dist/assets/img']);
});

// Default task
gulp.task('default', ['clean'], function() {
    gulp.start('styles', 'scripts', 'images');
});

// Watch
gulp.task('watch', function() {

  // Watch .scss files
  gulp.watch('css/**/*.scss', ['styles']);

  // Watch .js files
  gulp.watch('src/scripts/**/*.js', ['scripts']);

  // Watch image files
  gulp.watch('src/images/**/*', ['images']);

  // Create LiveReload server
  livereload.listen();

  // Watch any files in dist/, reload on change
  gulp.watch(['dist/**']).on('change', livereload.changed);

});