gulpfile.js

var gulp = require('gulp');
var gutil = require('gulp-util');
var bower = require('bower');
var concat = require('gulp-concat');
var sass = require('gulp-sass');
var minifyCss = require('gulp-minify-css');
var rename = require('gulp-rename');
var sh = require('shelljs');
var babel = require('gulp-babel');
var plumber = require('gulp-plumber');
var uglify = require('gulp-uglify');

var paths = {
	sass: ['./scss/**/*.scss'],
	es6: ['./www/app/**/*.module.js', './www/app/app.js', './www/app/**/*.js']
};

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

gulp.task("babel", function () {
  return gulp.src(paths.es6)
    .pipe(plumber())
	.pipe(concat('app.bundle.js'))
    .pipe(babel({presets: ['es2015']}))
    .pipe(gulp.dest("./www/"));
});

gulp.task("serve:before", [
    "sass",
    "babel",
    "watch"
]);

// gulp.task('concatJs', function () {
// 	return gulp.src(paths.es6)
// 		.pipe(concat('app.bundle.js'))
// 		.pipe(gulp.dest('./www/'));
// });




gulp.task('sass', function (done) {
	// gulp.src('./scss/ionic.app.scss')
	gulp.src('./scss/*.scss')
		.pipe(sass())
		.on('error', sass.logError)
		.pipe(gulp.dest('./www/css/'))
		.pipe(minifyCss({
			keepSpecialComments: 0
		}))
		.pipe(rename({ extname: '.min.css' }))
		.pipe(gulp.dest('./www/css/'))
		.on('end', done);
});

gulp.task('watch', ['sass', 'babel'], function () {
	gulp.watch(paths.sass, ['sass']);
	gulp.watch(paths.es6, ['babel']);
});

gulp.task('install', ['git-check'], function () {
	return bower.commands.install()
		.on('log', function (data) {
			gutil.log('bower', gutil.colors.cyan(data.id), data.message);
		});
});

gulp.task('git-check', function (done) {
	if (!sh.which('git')) {
		console.log(
			'  ' + gutil.colors.red('Git is not installed.'),
			'\n  Git, the version control system, is required to download Ionic.',
			'\n  Download git here:', gutil.colors.cyan('http://git-scm.com/downloads') + '.',
			'\n  Once git is installed, run \'' + gutil.colors.cyan('gulp install') + '\' again.'
		);
		process.exit(1);
	}
	done();
});