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wp-content/plugins/jetpack/extensions/blocks/markdown/markdown.php

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+<?php
+/**
+ * Markdown Block.
+ *
+ * @since 6.8.0
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Markdown;
+
+use Automattic\Jetpack\Blocks;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Registers the block for use in Gutenberg
+ * This is done via an action so that we can disable
+ * registration if we need to.
+ */
+function register_block() {
+	Blocks::jetpack_register_block( __DIR__ );
+}
+add_action( 'init', __NAMESPACE__ . '\register_block' );