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wp-content/plugins/jetpack-boost/compatibility/class-amp.php

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+<?php
+/**
+ * Compatibility for AMP.
+ *
+ * @package automattic/jetpack-boost
+ */
+
+namespace Automattic\Jetpack_Boost\Compatibility\Amp;
+
+use Automattic\Jetpack_Boost\Modules\Optimizations\Critical_CSS\Critical_CSS;
+
+/**
+ * Class AMP.
+ */
+class Amp {
+	/**
+	 * Critical_CSS module instance.
+	 *
+	 * @var Critical_CSS
+	 */
+	private static $critical_css;
+
+	/**
+	 * Init AMP compatibility actions after modules are initialized.
+	 *
+	 * @param Critical_CSS $module Critical_CSS Module instance.
+	 */
+	public static function init_compatibility( $module ) {
+		self::$critical_css = $module;
+
+		add_action( 'wp', array( __CLASS__, 'disable_critical_css' ), 0 );
+	}
+
+	/**
+	 * Disable Critical CSS display.
+	 */
+	public static function disable_critical_css() {
+		if ( amp_is_request() ) {
+			remove_action( 'wp', array( self::$critical_css, 'display_critical_css' ) );
+		}
+	}
+}
+
+add_action( 'jetpack_boost_critical-css_initialized', array( __NAMESPACE__ . '\Amp', 'init_compatibility' ) );