gulp example

Gulpfile.js

// Load plugins
var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    jshint = require('gulp-jshint'),
    uglify = require('gulp-uglify'),
    imagemin = require('gulp-imagemin'),
    rename = require('gulp-rename'),
    clean = require('gulp-clean'),
    concat = require('gulp-concat'),
    notify = require('gulp-notify'),
    cache = require('gulp-cache'),
    livereload = require('gulp-livereload'),
    lr = require('tiny-lr'),
    server = lr();

// Styles
gulp.task('styles', function() {
    return gulp.src('src/styles/main.scss')
        .pipe(sass({
            style: 'expanded',
        }))
        .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
        .pipe(gulp.dest('dist/styles'))
        .pipe(rename({
            suffix: '.min'
        }))
        .pipe(minifycss())
        .pipe(livereload(server))
        .pipe(gulp.dest('dist/styles'))
        .pipe(notify({
            message: 'Styles task complete'
        }));
});

// Scripts
gulp.task('scripts', function() {
    return gulp.src('src/scripts/**/*.js')
        .pipe(jshint('.jshintrc'))
        .pipe(jshint.reporter('default'))
        .pipe(concat('main.js'))
        .pipe(gulp.dest('dist/scripts'))
        .pipe(rename({
            suffix: '.min'
        }))
        .pipe(uglify())
        .pipe(livereload(server))
        .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(livereload(server))
        .pipe(gulp.dest('dist/images'))
        .pipe(notify({
            message: 'Images task complete'
        }));
});

// Clean
gulp.task('clean', function() {
    return gulp.src(['dist/styles', 'dist/scripts', 'dist/images'], {
        read: false
    })
        .pipe(clean());
});

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

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

    // Listen on port 35729
    server.listen(35729, function(err) {
        if (err) {
            return console.log(err)
        };

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

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

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

    });

});