vendor/illuminate/contracts/Auth/Factory.php

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<?php

namespace Illuminate\Contracts\Auth;

interface Factory
{
    /**
     * Get a guard instance by name.
     *
     * @param  string|null  $name
     * @return mixed
     */
    public function guard($name = null);

    /**
     * Set the default guard the factory should serve.
     *
     * @param  string  $name
     * @return void
     */
    public function shouldUse($name);
}