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File Content: `initializer-interface.php`

<?php

namespace Yoast\WP\SEO\Initializers;

use Yoast\WP\SEO\Loadable_Interface;

/**
 * Integration interface definition.
 *
 * An interface for registering integrations with WordPress.
 */
interface Initializer_Interface extends Loadable_Interface {

	/**
	 * Runs this initializer.
	 *
	 * @return void
	 */
	public function initialize();
}

File Content: initializer-interface.php

File Content: `initializer-interface.php`