update

wp-content/plugins/youtube-feed-pro/vendor/psr/container/src/ContainerExceptionInterface.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace SmashBalloon\YoutubeFeed\Vendor\Psr\Container;
+
+use Throwable;
+/**
+ * Base interface representing a generic exception in a container.
+ * @internal
+ */
+interface ContainerExceptionInterface extends Throwable
+{
+}

wp-content/plugins/youtube-feed-pro/vendor/psr/container/src/ContainerInterface.php

@@ -0,0 +1,35 @@
+<?php
+
+declare (strict_types=1);
+namespace SmashBalloon\YoutubeFeed\Vendor\Psr\Container;
+
+/**
+ * Describes the interface of a container that exposes methods to read its entries.
+ * @internal
+ */
+interface ContainerInterface
+{
+    /**
+     * Finds an entry of the container by its identifier and returns it.
+     *
+     * @param string $id Identifier of the entry to look for.
+     *
+     * @throws NotFoundExceptionInterface  No entry was found for **this** identifier.
+     * @throws ContainerExceptionInterface Error while retrieving the entry.
+     *
+     * @return mixed Entry.
+     */
+    public function get(string $id);
+    /**
+     * Returns true if the container can return an entry for the given identifier.
+     * Returns false otherwise.
+     *
+     * `has($id)` returning true does not mean that `get($id)` will not throw an exception.
+     * It does however mean that `get($id)` will not throw a `NotFoundExceptionInterface`.
+     *
+     * @param string $id Identifier of the entry to look for.
+     *
+     * @return bool
+     */
+    public function has(string $id);
+}

wp-content/plugins/youtube-feed-pro/vendor/psr/container/src/NotFoundExceptionInterface.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace SmashBalloon\YoutubeFeed\Vendor\Psr\Container;
+
+/**
+ * No entry was found in the container.
+ * @internal
+ */
+interface NotFoundExceptionInterface extends ContainerExceptionInterface
+{
+}