rollup creates `public/js/all.js` file on each run

[ctf0]

• gulpfile.js

  
  const elixir = require('laravel-elixir');

require('laravel-elixir-vue-2');

elixir.config.css.minifier.pluginOptions = { keepSpecialComments: 0 }; elixir.config.sourcemaps = false;

elixir(mix => { mix .sass('app.scss', 'public/assets/css/app-min.css') .rollup(['app.js', 'extra.js'], null, 'public/assets/js/app-min.js') } );

which produce
* public/assets/js/app-min.js
* public/js/all.js

if i removed `js/all.js` it will be re-added again 

EDIT:
actually rollup doesn't work with array syntax
`.rollup(['app.js', 'extra.js'], null, 'public/assets/js/app-min.js')` 
wont work