在 Laravel 9 中，执行：php artisan telescope:install 时报错：ERROR There are no commands defined in the “telescope” namespace.

1、在 Laravel 9 中，执行：php artisan telescope:install 时报错：ERROR There are no commands defined in the “telescope” namespace.。如图1

图1

PS E:\wwwroot\erp-backend> php artisan telescope:install

   ERROR  There are no commands defined in the "telescope" namespace.

2、发现应用程序的 config/app.php 配置文件中 TelescopeServiceProvider 服务提供者注册 已经删除。先再次添加回去。如图2

图2

3、再次运行：php artisan telescope:install。不再报错。如图3

图3

PS E:\wwwroot\erp-backend> php artisan telescope:install
Publishing Telescope Service Provider...
Publishing Telescope Assets...
Publishing Telescope Configuration...
Telescope scaffolding installed successfully.

4、还原第 2 步骤的操作，在 App\Providers\AppServiceProvider 类的 register 方法中，手动注册 telescope 的服务提供者

/**
 * 注册应用服务
 *
 * @return void
 */
public function register()
{
    if ($this->app->environment('local')) {
        $this->app->register(\Laravel\Telescope\TelescopeServiceProvider::class);
        $this->app->register(TelescopeServiceProvider::class);
    }
}