WP_Customize_Manager::doing_ajax( string|null $action = null ): bool

Source

public function doing_ajax( $action = null ) {
	if ( ! wp_doing_ajax() ) {
		return false;
	}
	if ( ! $action ) {
		return true;
	} else {
		/*
		 * Note: we can't just use doing_action( "wp_ajax_{$action}" ) because we need
		 * to check before admin-ajax.php gets to that point.
		 */
		return isset( $_REQUEST['action'] ) && wp_unslash( $_REQUEST['action'] ) === $action;
	}
}

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