gistfile1.js

var gulp = require('gulp');
var concat = require('gulp-concat');
var sourcemaps = require('gulp-sourcemaps');
var uglify = require('gulp-uglify');
var ngAnnotate = require('gulp-ng-annotate');
var bytediff = require('gulp-bytediff');
var plumber = require('gulp-plumber');
var rename = require('gulp-rename');

gulp.task('app', function() {
    return gulp.src(['public/app/**/ses.js', 'public/app/**/*.module.js', 'public/app/**/*.js'])
	    .pipe(plumber())
			.pipe(concat('ses.js', {newLine: ';'}))
			.pipe(ngAnnotate({add: true}))
	    .pipe(plumber.stop())
        .pipe(gulp.dest('public/src/js/app/'));
});

gulp.task('prod', ['app'], function() {
	return gulp.src('public/src/js/app/ses.js')
		.pipe(plumber())
			.pipe(bytediff.start())
				.pipe(uglify({mangle: true}))
			.pipe(bytediff.stop())
			.pipe(rename('ses.min.js'))
		.pipe(plumber.stop())
		.pipe(gulp.dest('public/src/js/app/'));
});

gulp.task('watch', ['prod'], function () {
	return gulp.watch('public/app/**/*.js', ['prod']);
});

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