Flask - Serve all dependencies from a local lib/ directory in development mode

server.py

# Serve lib/ folder only in development mode
@server_bp.route('/lib/<dep>', defaults={'path': ''})
@server_bp.route('/lib/<path:path>/<dep>')
def serve_lib_in_dev(path, dep):
    path = os.path.join('lib/', path)
    dev = current_app.config["DEBUG"]
    if dev:
        return flask.send_from_directory(path, dep)
    else:
        print('Trying to retrieve a dependency from a local folder in production. Skipping.')