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wp-content/plugins/jetpack-boost/app/contracts/interface-needs-to-be-ready.php

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+<?php
+
+namespace Automattic\Jetpack_Boost\Contracts;
+
+interface Needs_To_Be_Ready {
+	/**
+	 * Check if the module is ready and already optimizing.
+	 * This is useful for modules that need preparation before they can start serving the optimized output. E.g. Critical CSS.
+	 */
+	public function is_ready();
+}