Please use this repo: https://github.com/Pross/beaver-cache-helper This gist will not be updated anymore.

cachehelper.php

<?php
/**
 * Plugin Name: Beaver Builder Cache Helper
 * Description: This plugin will clear various caches when layouts and templates are saved. It also clears the cache when WordPress finishes updating plugins and themes. The plugin also defines the DONOTCACHEPAGE constant when the builder is active, this is respected by most cache plugins.
 * Version: 1.0
 * License: GNU General Public License v2.0
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 */
class FL_Cache_Buster {

	public static function init() {
		add_action( 'upgrader_process_complete',           array( __class__, 'clear_caches' ) );
		add_action( 'fl_builder_after_save_layout',        array( __class__, 'clear_caches' ) );
		add_action( 'fl_builder_after_save_user_template', array( __class__, 'clear_caches' ) );
		add_action( 'template_redirect',                   array( __class__, 'donotcache' ) );
	}

	/**
	 * Clear the various cache plugins.
	 */
	public static function clear_caches() {

		//rocket cache
		if ( function_exists( 'rocket_clean_domain' ) ) {
			rocket_clean_domain();
		}

		// wp-super-cache
		if ( function_exists( 'wp_cache_clear_cache' ) ) {
			wp_cache_clear_cache();
		}

		// WPEngine
		if ( class_exists( 'WpeCommon' ) ) {
			WpeCommon::purge_memcached();
			WpeCommon::clear_maxcdn_cache();
			WpeCommon::purge_varnish_cache();
		}

		// w3 total crash
		if ( function_exists( 'w3tc_pgcache_flush' ) ) {
			w3tc_pgcache_flush();
		}

		// siteground
		if ( function_exists( 'sg_cachepress_purge_cache' ) ) {
			sg_cachepress_purge_cache();
		}
		error_log( 'Cleared Caches' );
	}

	/**
	 * Set DONOTCACHEPAGE if builder is active.
	 */
	public static function donotcache() {
		if ( ! defined( 'DONOTCACHEPAGE' )
			&& class_exists( 'FLBuilderModel' )
			&& FLBuilderModel::is_builder_active() ) {
				define( 'DONOTCACHEPAGE', true );
		}
	}

}
FL_Cache_Buster::init();