gulpfile.js

var gulp = require('gulp');
var uglify = require('gulp-uglify');
var jshint = require('gulp-jshint');
var header = require('gulp-header');
var rename = require('gulp-rename');
var del = require('del');
var pkg = require('./package.json');

// Config
var config = {
    src: 'src/',
    dist: 'dist/'
};

// Banner
var banner = [
    '/*!',
    ' * <%= pkg.name %> v<%= pkg.version %>',
    ' * <%= pkg.title %>',
    ' * <%= pkg.homepage %>',
    '',
    ' * Copyright (c) 2016, <%= pkg.author.name %>',
    ' * Released under the <%= pkg.license.name %> license.',
    ' */',
    ''
].join('\n');

// Clean task
gulp.task('clean', function(cb) {
    del(['dist/*.js'], cb);
});

// Default task
gulp.task('default', function() {
    return gulp.src(config.src + '*.js')
        .pipe(jshint('.jshintrc'))
        .pipe(jshint.reporter('jshint-stylish'))
        .pipe(header(banner, {pkg: pkg}))
        .pipe(gulp.dest(config.dist))
        .pipe(rename({suffix: '.min'}))
        .pipe(uglify({preserveComments: 'some'}))
        .pipe(gulp.dest(config.dist));
});

// Watch task
gulp.task('watch', function() {
    gulp.watch(config.src + '*.js', ['default']);
});