No, because Flarum does not operate with a drag-n-drop sort of philosophy for extending it. The only files that typically need manual editing are in the Flarum root folder, and the times those should need edits are rare. Otherwise, changes to the Flarum files are mainly done through Composer commands, which act upon the composer.json file and vendor folder, the latter of which is treated as completely disposable (you can delete it and run composer install to restore it again with no harm to your Flarum site).
Manual file changes in Flarum are discouraged as these do not persist between updates and because of the disposable nature of all but a few files. If you wish to make changes, you're better off using an extend.php file, or writing a full extension to do so.
If this is something you're looking to do, feel free to open a discussion and describe what your goal is so we can help you achieve this?
