Stop loading block's CSS and JS if the block is not used -- for Full Site Edit themes [WordPress]

stop_loading_blocks_crap_fse.php

// Avoid loading unused assets, both JS and CSS
// Removes both CSS and JS
// For Full Site Editing Theme!
// In a better world block's author makes sure the block's assests are loaded only if block is actually in use (via enqueue_block_assets). For other cases we can do it ourselves
// In this example I load Swiper's block assets only where the block is used
// TODO: Works for content on Singular content only. if block is elsewhere or it's archive use this https://wordpress.stackexchange.com/questions/392493/find-if-widget-block-is-active

add_filter( 'style_loader_tag', 'sz_stop_loading_unused_block_crap', 9999, 3 ); 
add_filter( 'script_loader_tag', 'sz_stop_loading_unused_block_crap', 10, 3 );
function sz_stop_loading_unused_block_crap( $tag, $handle, $src ) {
	 //The list of plugins/blocks to optimize: plugin directory & block name 
	 $exclusions = [
					['plugins/wp-swiper', 'da/wp-swiper-slide'],
					['plugins/better-click-to-tweet', 'bctt/clicktotweet']
					];
	// to find out the name of the block in Browser Inspector (not source code) ctrl+f for "data-type"
	if (!is_user_logged_in()){// for FE only	 
		 foreach ($exclusions as $exclusion){
			 // Check if block's assets are loaded 
			if (str_contains($src, $exclusion[0])) {				
				if ( is_singular() ){ // do on singular only
					$id = get_the_ID();	
					if (has_block($exclusion[1], $id) !== true) { 
						$tag = '';	
					}
				}
				//elseif ( is_archive() )  { // I am not aware of checking which blocks are used on templates other than Singular - archives, search, homepage}
				else { // not singular
					$tag = '';				// do not load anywhere but singular all. Attention -- might be not what you need.				
				}
				
			} 
		 }			
	}
    return $tag;
}