src/Container/BladeRegistrar.php
public static function register($extension, $concrete = null)
    {
        app()->singleton($extension, $concrete);
        app()->tag($extension, 'blade.extension');
    }
public static function register($extension, $concrete = null)
    {
        app()->singleton($extension, $concrete);
        app()->tag($extension, 'blade.extension');
    }
public static function register ( $ extension , $ concrete = null ) { app ( ) -> singleton ( $ extension , $ concrete ) ; app ( ) -> tag ( $ extension , 'blade.extension' ) ; }
Register and tag a blade service in the container

@param  string|array  $abstract
@param  \Closure|string|null  $concrete
Register and tag a blade service in the container