Issue #3301124 by gilmord, Grevil, Anybody: cookies_filter requires...

## Requirements

The following modules are required.

### The following modules are required.

- [COOKiES](https://www.drupal.org/project/cookies)

### The following libraries are required:

- symfony/dom-crawler

- symfony/css-selector

#### There are several ways to download the needed third-party libraries.

#### Recommended:

Use the [Composer Merge plugin](https://github.com/wikimedia/composer-merge-plugin)

to include the Cookies Filter module\'s [composer.libraries.json](https://cgit.drupalcode.org/cookies/tree/modules/cookies_filter/composer.libraries.json)

#### Optional:

Execute composer commands:

- composer require symfony/dom-crawler

- composer require symfony/css-selector

{

    "name": "drupal/cookies",

    "require": {

        "symfony/dom-crawler": "*",

        "symfony/css-selector": "*"

    }

}

  // Load module after other third-party module.

  module_set_weight('cookies_filter', 11);

}

/**

 * Implements hook_requirements().

 */

function cookies_filter_requirements($phase) {

  $requirements = [];

  if ($phase === 'install') {

    if (!class_exists('Symfony\Component\DomCrawler\Crawler')) {

      $requirements['cookies_filter']['description'] = t('The cookies_filter module requires "symfony/dom-crawler" please require this composer package, via "composer require symfony/dom-crawler" or follow instructions in hook_help().');

      $requirements['cookies_filter']['severity'] = REQUIREMENT_ERROR;

    }

    if (!class_exists('Symfony\Component\CssSelector\CssSelectorConverter')) {

      $requirements['cookies_filter']['description'] = t('The cookies_filter module requires "symfony/css-selector" please require this composer package, via "composer require symfony/css-selector" or follow instructions in hook_help().');

      $requirements['cookies_filter']['severity'] = REQUIREMENT_ERROR;

    }

  }

  return $requirements;

}