You need to update your composer.json classmap, before running dump-autoload. Inside composer.json file add the path to your class to this section

	"autoload": {
		"classmap": [
			"app/commands",
			...
			"app/path/to/your/class"
		]
	},

Here is a great example on how to build your custom filter class http://daylerees.com/codebright/filters

DavidDomain said:

You need to update your composer.json classmap, before running dump-autoload. Inside composer.json file add the path to your class to this section

  "autoload": {
  	"classmap": [
  		"app/commands",
  		...
  		"app/path/to/your/class"
  	]
  },

Here is a great example on how to build your custom filter class http://daylerees.com/codebright/filters

Thank you for your replay. I found the same file in the gibhub i replaced it and worked without to add it in the composer