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wp-content/plugins/jetpack/extensions/blocks/sharing-buttons/render.php

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+<?php
+/**
+ * Sharing Buttons block render implementation.
+ *
+ * Loaded lazily from sharing-buttons.php only when the block is rendered, to keep
+ * the render body out of the eager front-end PHP/opcache footprint.
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Sharing_Buttons;
+
+use Automattic\Jetpack\Status\Request;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Sharing Buttons block registration/dependency declaration.
+ *
+ * @param array  $attr    Array containing the Sharing Buttons block attributes.
+ * @param string $content String containing the Sharing Buttons block content.
+ *
+ * @return string
+ */
+function render_block_implementation( $attr, $content ) {
+	// Render nothing in other contexts than frontend (i.e. feed, emails, API, etc.).
+	if ( ! Request::is_frontend() ) {
+		return '';
+	}
+
+	return $content;
+}