Using Laravel Elixir in non Laravel project (for WordPress project).

gulpfile.js

 
 const elixir = require('laravel-elixir');
 
 /*
  |--------------------------------------------------------------------------
  | Elixir Asset Management
  |--------------------------------------------------------------------------
  |
  | Elixir provides a clean, fluent API for defining some basic Gulp tasks
  | for your Laravel application. By default, we are compiling the Sass
  | file for your application as well as publishing vendor resources.
  |
  */
 
 
 elixir.config.assetsPath = 'assets';
 
 
 elixir((mix) => {
     mix.sass('main.scss', 'style.css');
 });