Kahlan\Filter\Filter::register PHP Method

    public static function register($name, $aspect = null)
    {
        if (is_array($name)) {
            static::$_aspects = $name;
            return;
        }
        if ($aspect === null) {
            $aspect = $name;
            $name = uniqid();
        }
        static::$_aspects[$name] = $aspect;
        return $name;
    }

<?php

use Kahlan\Filter\Filter;
use Kahlan\Reporter\Coverage;
use Kahlan\Reporter\Coverage\Driver\Xdebug;
use Kahlan\Reporter\Coverage\Exporter\Coveralls;
use Kahlan\Reporter\Coverage\Exporter\CodeClimate;
$args = $this->args();
$args->argument('coverage', 'default', 3);
Filter::register('kahlan.coverage', function ($chain) {
    if (!extension_loaded('xdebug')) {
        return;
    }
    $reporters = $this->reporters();
    $coverage = new Coverage(['verbosity' => $this->args()->get('coverage'), 'driver' => new Xdebug(), 'path' => $this->args()->get('src'), 'exclude' => ['src/init.php', 'src/Cli/Kahlan.php', 'src/Reporter/Coverage/Collector.php', 'src/Reporter/Coverage/Driver/Xdebug.php', 'src/Reporter/Coverage/Driver/HHVM.php', 'src/Reporter/Coverage/Driver/Phpdbg.php', 'src/Reporter/Dot.php', 'src/Reporter/Bar.php', 'src/Reporter/Verbose.php', 'src/Reporter/Terminal.php', 'src/Reporter/Reporter.php', 'src/Reporter/Coverage.php'], 'colors' => !$this->args()->get('no-colors')]);
    $reporters->add('coverage', $coverage);
});
Filter::apply($this, 'coverage', 'kahlan.coverage');
Filter::register('kahlan.coverage-exporter', function ($chain) {
    $reporter = $this->reporters()->get('coverage');
    if (!$reporter) {
        return;
    }
    Coveralls::write(['collector' => $reporter, 'file' => 'coveralls.json', 'service_name' => 'travis-ci', 'service_job_id' => getenv('TRAVIS_JOB_ID') ?: null]);
    CodeClimate::write(['collector' => $reporter, 'file' => 'codeclimate.json', 'branch' => getenv('TRAVIS_BRANCH') ?: null, 'repo_token' => 'a4b5637db5629f60a5d3fc1a070b2339479ff8989c6491dfc6a19cada5e4ffaa']);
    return $chain->next();
});
Filter::apply($this, 'reporting', 'kahlan.coverage-exporter');