Update Laravel asset version configuration for Laravel Elixir.
npm install --save-dev laravel-elixir-asset-version
require('laravel-elixir-asset-version');
elixir((mix) => {
mix.sass('app.scss')
.webpack('app.js')
// .assetVersion() // Do not watch file changes
.assetVersion(['js', 'css']) // Watch "public/js", "public/css" directories
});