filters.php

<?php

### --- Snip --- ###

App::after(function($request, $response)
{
	// HTML Minification
	if(App::Environment() != 'local')
	{
		if($response instanceof Illuminate\Http\Response && str_contains($response->headers->get('content-type'), 'text/html'))
		{
			$output = $response->getOriginalContent();
			
			$filters = array(
				'/<!--([^\[|(<!)].*)/'		=> '', // Remove HTML Comments (breaks with HTML5 Boilerplate)
				'/(?<!\S)\/\/\s*[^\r\n]*/'	=> '', // Remove comments in the form /* */
				'/\s{2,}/'			=> ' ', // Shorten multiple white spaces
				'/(\r?\n)/'			=> '', // Collapse new lines
			);
			
			$output = preg_replace(array_keys($filters), array_values($filters), $output);
			$response->setContent($output);
		}
	}
});

### --- Snip --- ###

Hello @EmilMoe, This is for Laravel, and you put is code in global.php file,
You can see original gist in https://gist.github.com/zmsaunders/5619519.
¡Saludos!