Browserify Angular application gulpfile for Laravel5.1 (Elixir)

backend.env.js

module.exports = {
    assetsPath: 'resources/backend/assets',
    publicPath: 'public/backend',

    angularPath: 'resources/backend/angular/'
};

frontend.env.js

module.exports = {
    assetsPath: 'resources/frontend/assets',
    publicPath: 'public/frontend',

    angularPath: 'resources/frontend/angular/'
};

gulpfile.js

var elixir = require('laravel-elixir');
var gulp = require('gulp');
var _ = require('lodash');

elixir.config.js.browserify.transformers.push({
    name: 'browserify-ngannotate',
    options: {}
});

elixir.extend('assign', function(config, settings) {
    new elixir.Task('assign', function() {
        return _.assign(config, settings);
    })
});

function doElixir(mix, settings) {
    mix.assign(elixir.config, settings)
        .sass('app.scss')
        .browserify('../../../' + settings.angularPath + '/index.js', settings.publicPath  + '/js/app.js')
        .browserify('../../../' + settings.assetsPath + '/js/vendor.js', settings.publicPath  + '/js/vendor.js')
        .copy(settings.assetsPath + '/../angular/templates', settings.publicPath + '/templates');

    return mix;
}

gulp.task('backend', ['frontend'], function() {
    return elixir(function (mix) {
        return doElixir(mix, require('./gulp/backend.env.js'));
    });
});

gulp.task('frontend', function() {
    return elixir(function (mix) {
        return doElixir(mix, require('./gulp/frontend.env.js'));
    });
});

gulp.task('default', ['backend'], function() {});
gulp.task('front', ['frontend'], function() {});

gulp.task('watch', ['backend'], function() {});