laravel-elixir-config.js

(function (file) {
  var fs = require('fs'),
      _  = require('underscore');

  if (fs.existsSync(file)) {
    _.mixin({
      deepExtend: require('underscore-deep-extend')(_)
    });

    _.deepExtend(elixir.config, JSON.parse(fs.readFileSync(file, 'utf8')));
  }
})('config.json');