Example Blade Extension class to group Blade conditionals and directives...

BladeExtension.php

<?php

/**
 * This interface would be provided by the framework and properly namespaced
 * This is just an example of what an interface might be like...
 */
interface BladeExtension
{
    public function getDirectives();

    public function getConditionals();
}

ExampleBladeExtension.php

<?php

/**
 * Example blade extension class for grouping extensions
 */
class ExampleBladeExtension implements BladeExtension
{
    public function getDirectives()
    {
        return [
            'truncate' => [$this, 'truncate']
        ];
    }

    public function getConditionals()
    {
        return [
            'prod' => [$this, 'isProduction']
        ];
    }

    public function isProduction()
    {
        return app()->environment('production');
    }

    /**
     * @see https://zaengle.com/blog/exploring-laravels-custom-blade-directives
     */
    public function truncate($expression)
    {
        list($string, $length) = explode(',',str_replace(['(',')',' '], '', $expression));

        return "<?php echo e(strlen({$string}) > {$length} ? substr({$string},0,{$length}).'...' : {$string}); ?>";
    }
}

MyServiceProvider.php

<?php

/**
 * This isn't properly namespaced, just an example service provider
 * @see https://laravel.com/docs/5.4/providers
 */
class MyServiceProvider
{
    public function register()
    {
        // Service container available to extensions
        $this->app->bind('ExampleBladeExtension', function ($app) {
            return new ExampleBladeExtension();
        });

        $this->app->tag(['ExampleBladeExtension'], 'blade.extension');
    }
}

// Laravel would then grab all these out of the container (not in this file), including packages,
// and register them properly with blade 👍
collect($this->app->tagged('blade.extension'))->each(function ($extension) {
    // register directives with callables - $extension->getDirectives()
    // register Blade::if() with callables - $extension->getConditionals()
});

I dig how you register twig extensions in Symfony through the container - https://symfony.com/doc/current/templating/twig_extension.html

These are just some ideas, not real working code. Sometimes I like grouping related extensions .