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vendor/symfony/contracts/EventDispatcher/EventDispatcherInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Contracts\EventDispatcher;
+
+use Psr\EventDispatcher\EventDispatcherInterface as PsrEventDispatcherInterface;
+
+if (interface_exists(PsrEventDispatcherInterface::class)) {
+    /**
+     * Allows providing hooks on domain-specific lifecycles by dispatching events.
+     */
+    interface EventDispatcherInterface extends PsrEventDispatcherInterface
+    {
+        /**
+         * Dispatches an event to all registered listeners.
+         *
+         * For BC with Symfony 4, the $eventName argument is not declared explicitly on the
+         * signature of the method. Implementations that are not bound by this BC constraint
+         * MUST declare it explicitly, as allowed by PHP.
+         *
+         * @param object      $event     The event to pass to the event handlers/listeners
+         * @param string|null $eventName The name of the event to dispatch. If not supplied,
+         *                               the class of $event should be used instead.
+         *
+         * @return object The passed $event MUST be returned
+         */
+        public function dispatch($event/*, string $eventName = null*/);
+    }
+} else {
+    /**
+     * Allows providing hooks on domain-specific lifecycles by dispatching events.
+     */
+    interface EventDispatcherInterface
+    {
+        /**
+         * Dispatches an event to all registered listeners.
+         *
+         * For BC with Symfony 4, the $eventName argument is not declared explicitly on the
+         * signature of the method. Implementations that are not bound by this BC constraint
+         * MUST declare it explicitly, as allowed by PHP.
+         *
+         * @param object      $event     The event to pass to the event handlers/listeners
+         * @param string|null $eventName The name of the event to dispatch. If not supplied,
+         *                               the class of $event should be used instead.
+         *
+         * @return object The passed $event MUST be returned
+         */
+        public function dispatch($event/*, string $eventName = null*/);
+    }
+}