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wp-content/plugins/jetpack-boost/app/contracts/interface-changes-output-after-activation.php

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+<?php
+
+namespace Automattic\Jetpack_Boost\Contracts;
+
+/**
+ * Modules can implement this interface to indicate that they change the HTML output for the site visitor and they may do it after activation.
+ * E.g. Critical CSS needs to be generated first.
+ */
+interface Changes_Output_After_Activation {
+
+	/**
+	 * Get the action name(s) that should be used to indicate that the module is ready and changing the page output.
+	 *
+	 * @return string[] The names of action hooks which will be triggered to indicate when the module changes the page output.
+	 */
+	public static function get_change_output_action_names();
+}