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

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+<?php
+
+namespace Automattic\Jetpack\Boost\App\Contracts;
+
+/**
+ * Indicate that a feature is under development.
+ *
+ * If present, the feature will be only visible with JETPACK_BOOST_DEVELOPMENT_FEATURES defined as `true` or in Jurassic Ninja.
+ */
+interface Is_Dev_Feature {}