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wp-content/plugins/jetpack-boost/app/lib/class-debug.php

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+<?php
+/**
+ * Implement debug helper methods.
+ *
+ * @link       https://automattic.com
+ * @since      1.0.0
+ * @package    automattic/jetpack-boost
+ */
+
+namespace Automattic\Jetpack_Boost\Lib;
+
+/**
+ * Class Debug
+ */
+class Debug {
+	/**
+	 * Returns whether the debug mode has been triggered.
+	 */
+	public static function is_debug_mode() {
+		$script_debug      = defined( 'SCRIPT_DEBUG' ) && \SCRIPT_DEBUG;
+		$manual_debug_mode = filter_input( INPUT_GET, 'jetpack-boost-debug' );
+
+		$debug = $script_debug || $manual_debug_mode;
+
+		/**
+		 * Filter debug status on/off
+		 *
+		 * @param bool $debug_status enable or disable debug mode.
+		 *
+		 * @since   1.0.0
+		 */
+		return apply_filters( 'jetpack_boost_debug', $debug );
+	}
+}