I am creating a way to dynamically create routes before the server fully starts (meaning I’m not creating a route via a request lol that would be crazy), and I stumbled upon this interesting quirk.

Here is a minimal example. In the real program, there’s “post”, “patch”, etc. in the args, a path in the args, middleware, etc., but the result is all the same:

export function createRoute(args: { search?: () => Promise<void> }) {
    if (args.search) {
        expressClient.get(
            "",
            async (req, res) => {
                await args.search(); // Cannot invoke an object which is possibly 'undefined'
            }
        );
    }
}

Why is this happening?