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wp-content/plugins/jetpack-boost/app/contracts/interface-sub-feature.php

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+<?php
+
+namespace Automattic\Jetpack_Boost\Contracts;
+
+interface Sub_Feature extends Feature {
+
+	/**
+	 * Get the parent features that are required for this feature to work.
+	 *
+	 * At least one parent feature must be enabled for this feature to work.
+	 *
+	 * @return class-string<Feature>[] The parent features.
+	 */
+	public static function get_parent_features(): array;
+}