feat: Log large assets that are initially loaded on the frontend

lib/private/Template/ResourceLocator.php

@@ -7,6 +7,7 @@
  */
 namespace OC\Template;
 
+use OC\SystemConfig;
 use Psr\Log\LoggerInterface;
 
 abstract class ResourceLocator {
@@ -20,6 +21,8 @@ abstract class ResourceLocator {
 
 	protected LoggerInterface $logger;
 
+	private const LOG_LARGE_ASSET_OFFSET = 1024 * 1024;
+
 	public function __construct(LoggerInterface $logger) {
 		$this->logger = $logger;
 		$this->mapping = [
@@ -76,6 +79,10 @@ public function find($resources) {
 	 */
 	protected function appendIfExist($root, $file, $webRoot = null) {
 		if ($root !== false && is_file($root.'/'.$file)) {
+			$systemConfig = \OCP\Server::get(SystemConfig::class);
+			if ($systemConfig->getValue('debug', false) && filesize($root.'/'.$file) > self::LOG_LARGE_ASSET_OFFSET) {
+				$this->logger->debug("$root/$file is larger then 1MB, consider reducing the size for javascript entrypoints");
+			}
 			$this->append($root, $file, $webRoot, false);
 			return true;
 		}

tests/lib/Template/ResourceLocatorTest.php

@@ -29,8 +29,13 @@ public function getResourceLocator($theme) {
 		$systemConfig
 			->expects($this->any())
 			->method('getValue')
-			->with('theme', '')
-			->willReturn($theme);
+			->willReturnCallback(function ($key, $default = null) use ($theme) {
+				if ($key === 'theme') {
+					return $theme;
+				}
+
+				return $default;
+			});
 		$this->overwriteService(SystemConfig::class, $systemConfig);
 		return $this->getMockForAbstractClass('OC\Template\ResourceLocator',
 			[$this->logger],